Label:Format::Units:Description.
~ (tilda) is a line-break marker in DESCRIPTION.
The colon is a field marker. Do not use a colon in Description (or any field...).

Event ID field.
Seq_Num:ASCII_Integer::none:A unique sequence number for the occultation. This sequence number is used in the timings file as well, to identify which occultation a given observation pertains to.

Date time fields.
OBS_DATE:ASCII_Date_YMD::none:Date of observation.
TIME_ZERO:ASCII_Real:%4.1f:hr:Time origin on OBS_DATE for the asteroid motions AST_EAST_MOTION, AST_EAST_MOTION_2ND, AST_EAST_MOTION_3RD, AST_NORTH_MOTION, AST_NORTH_MOTION_2ND, AST_NORTH_MOTION_3RD. TIME_ZERO is specified in exact increments of 0.1 hours, and is never 0.0.

Star fields.
STAR_CATALOG:UTF8_String::none:Name of catalogue used to identify the occulted star.~HIP = Hipparcos Catalog, from 'The Hipparcos and Tycho Catalogs, ESA SP-1200' [ESA1997]~Tycho2 = Tycho-2 Catalog, from 'The Hipparcos and Tycho Catalogs, ESA SP-1200' [ESA1997]~UCAC4 = The fourth U.S. Naval Observatory CCD Astrograph Catalog (UCAC4) Zacharias N., Finch C.T., Girard T.M., Henden A., Bartlett J.L., Monet D.G., Zacharias M.I. [Astron. J. 145, 44 (2013)] ~J-coords = Identified by coordinates. Only used when the star is not in HIP, Tycho-2 or UCAC4, or when there is not a clear match between the position in those catalogues and a Gaia EDR3 star ~USNO-B1 = The USNO-B Catalog Monet D.G., Levine S.E., Casian B., et al. [Astron. J., 125, 984 (2003)]~NOMAD = Naval Observatory Merged Astrometric Dataset  Zacharias N. , Monet D.G., Levine S.E. et..al [2004AAS...205.4815Z (ADS)].
STAR_NUM:UTF8_String::none:Star identifier in STAR_CATALOG.~for J-coords, the identifier is formatted as either hhmmss.s-ddmmss, or hhmmss.ss-ddmmss.s.
GAIA_VERSION:ASCII_Integer::none:Data Release version of GAIA used for the star position.~ 0 = Hipparcos2 ~1 = Gaia DR1 ~2 = Gaia DR2 ~3 = GAIA DR3 (including EDR3) ~9 = UBSC (USNO Bright Star Catalog 2022) ~-1 = not specified.
GAIA_ID:ASCII_Integer::none:GAIA 18-digit identifier. or the Hipparcos number.
STAR_RA:ASCII_Real:%13.10f:hr:Right Ascension of the star, GCRS coordinates. (That is, coordinates referred to the ICRS reference frame of 2000, proper motion to date, corrected for parallax). No correction for relativistic light bending.
STAR_DEC:ASCII_Real:%13.9f:deg:Declination of the star, GCRS coordinates. (That is, coordinates referred to the ICRS reference frame of 2000, proper motion to date, corrected for parallax). No correction for relativistic light bending.
STAR_RA_UNCERT:ASCII_Real:%7.2f:milliarcsec:Uncertainty in Right Ascension - incorporating position, proper motion and parallax uncertainties.
STAR_DEC_UNCERT:ASCII_Real:%7.2f:milliarcsec:Uncertainty in Declination - incorporating position, proper motion and parallax uncertainties.
STAR_DIA:ASCII_Real:%6.2f:milliarcsec:Angular diameter of the star - using the Gaia estimated star diameter.
ISSUES:ASCII_Integer::none:Issues flag. ~0 = no issues~1 = high RUWE~2 = Duplicate source flag~3 = High RUWE and Duplicate source flag~These are GAIA flags. RUWE is the GAIA Renormalised Unit Weight Error; 'high RUWE' is set when RUWE >1.4.
STAR_RA_APPT:ASCII_Real:%11.8f:hr:Apparent RA of the star at  OBS_DATE + TIME_ZERO, with no correction for relativistic light bending.
STAR_DEC_APPT:ASCII_Real:%11.7f:deg:Apparent declination of the star at OBS_DATE + TIME_ZERO, with no correction for relativistic light bending.
STAR_B_MAG:ASCII_Real:%5.2f:none:Gaia BPmag. For non-Gaia stars, the B magnitude.
STAR_G_MAG:ASCII_Real:%5.2f:none:Gaia Gmag magnitude. For non-Gaia stars, the V magnitude.
STAR_R_MAG:ASCII_Real:%5.2f:none:Gaia RPmag. For non-Gaia stars, the R magnitude.
EPIC_ID:ASCII_Integer::none:Star identifer if it was observed in the Kepler2 mission. This field has not been maintained since the cessation of that mission in 2018.
STAR_Position_RELIABILITY:ASCII_Real:%5.2f:none:An indication of the reliability of the star position ~for star positions sourced from Gaia DR2 or DR3, the RUWE value. RUWE is the GAIA Renormalised Unit Weight Error; RUWE >1.4 indicates potential problems with the star position. Quote - "The RUWE is expected to be around 1.0 for sources where the single-star model provides a good fit to the astrometric observations. A value significantly greater than 1.0 (say, >1.4) could indicate that the source is non-single or otherwise problematic for the astrometric solution." ~for star positions sourced from Gaia DR1 (TychoGaia), the 'astrometric-excess-noise' value ~for star positions sourced from Hipparcos2 (2008), the 'square root of the reduced chi-square' of Equation B.4 in Daniel Michalik et al - Joint astrometric solution of Hipparcos and Gaia, [Astron. Astrophys., 571 (2014) A85].
DUP_SOURCE:ASCII_Integer::none:Duplicated source flag~-1 = Not specified (the position comes from Hipparcos2 or TychoGaia~0 = not set~1 = DuplicateSource flag set in GaiaEDR3 or DR2.
NO_PM:ASCII_Integer::none:No GAIA proper motion~-1 = not set (source position from Hipparcos2 or TychoGaia)~0 = there is a Gaia Proper motion value~1 = Gaia does not contain proper motions. As a result, the position of the star reduces in accuracy for dates removed from the epoch.
PM_USING_UCAC4:ASCII_Integer::none:For same stars where Gaia does not provide a proper motion value, a proper motion has been derived by comparing the position of the star in Gaia with that in UCAC4. This improves the accuracy of the star position compared to when there is no proper motion~-1 = not set (source position from Hipparcos2 or TychoGaia)~0 = not applicable~1 = proper motion added.
BRIGHTNESS_RATIO:ASCII_Real:%5.2f:none:Where a star is detected as a double star, the ratio of the brightness of the two stars - usually as measured from a light curve. Used to derive the offset of the star used for the analysis, from the catalogue position for the star. The ratio is the brightness of the component that is used for the analysis, compared to the brightness of the companion star. Usually the analysis is based on the brighter component, and the ratio is greater than 1. The default value is 1.20.
BRIGHTNESS_UNCERT:ASCII_Integer::none:Uncertainty in BRIGHTNESS_RATIO, as a percentage. The default value is 10.
DOUBLE_SOLN_RA_OFFSET:ASCII_Real:%7.2f:milliarcsec:Offset in Right Ascension from the catalogue position of the star. The offset is of the component that is the basis of the analysis of the occultation. It is derived using the double star solution from the occultation, and the BRIGHTNESS_RATIO. Where there is more than one double star solution, the offset is a mean of the individually computed offsets.
DOUBLE_SOLN_RA_UNCERT:ASCII_Real:%6.2f:milliarcsec:The uncertainty in the Offset in Right Ascension. Derived as the standard deviation of the individually computed offsets, combined with the uncertainty in the offsets arising from BRIGHTNESS_UNCERT.
DOUBLE_SOLN_DEC_OFFSET:ASCII_Real:%6.2f:milliarcsec:Offset in Declination from the catalogue position of the star. The offset is of the component that is the basis of the analysis of the occultation. It is derived using the double star solution from the occultation, and the BRIGHTNESS_RATIO. Where there is more than one double star solution, the offset is a mean of the individually computed offsets.
DOUBLE_SOLN_DEC_UNCERT:ASCII_Real:%6.2f:milliarcsec:The uncertainty in the Offset in Declination. Derived as the standard deviation of the individually computed offsets, combined with the uncertainty in the offsets arising from BRIGHTNESS_UNCERT.
DOUBLE_KnownPair_ID:UTF8_String::none:For a double star observation of a known pair, the Component pair identification in the Washington Double Star Catalog (WDS). If the observation was a pair discovery, the subsequent pair identifier in the WDS is not given here.

Asteroid and its motion fields.
AST_DESIG:UTF8_String::none:For asteroids, the asteroid's number. For comets, the comet's designation (e.g.  29P).
AST_NAME:UTF8_String::none:Asteroid's name, or its provisional designation. For comet's, the comet's name.
AST_EAST_MOTION:ASCII_Real:%12.8f:earth_radius/hr:Linear motion of the asteroid Eastwards on the 'Apparent' Fundamental plane from TIME_ZERO.
AST_NORTH_MOTION:ASCII_Real:%12.8f:earth_radius/hr:Linear motion of the asteroid Northwards on the 'Apparent' Fundamental plane from TIME_ZERO.
AST_EAST_MOTION_2ND:ASCII_Real:%10.7f:earth_radius/hr:Second-order motion of the asteroid Eastwards on the 'Apparent' Fundamental plane from TIME_ZERO.
AST_NORTH_MOTION_2ND:ASCII_Real:%10.7f:earth_radius/hr:Second-order motion of the asteroid Northwards on the 'Apparent' Fundamental plane from TIME_ZERO.
AST_EAST_MOTION_3RD:ASCII_Real:%10.7f:earth_radius/hr:Third-order motion of the asteroid Eastwards on the 'Apparent' Fundamental plane from TIME_ZERO.
AST_NORTH_MOTION_3RD:ASCII_Real:%10.7f:earth_radius/hr:Third-order motion of the asteroid Northwards on the 'Apparent' Fundamental plane from TIME_ZERO.
AST_PARALLAX:ASCII_Real::arcsec:Parallax of the asteroid at TIME_ZERO.
AST_PARALLAX_HR:ASCII_Real::arcsec:Hourly rate of change in AST_PARALLAX.
AST_DIA_NOMINAL:ASCII_Real:%6.1f:km:Mean diameter of the asteroid, derived as a weighted mean of the diameters measured by the IRAS, Akari AcuA, and NEOWISE missions.
AST_DIA_UNCERT:ASCII_Real:%5.1f:km:Uncertainty in AST_DIA_NOMINAL.
AST_V_MAG:ASCII_Real:%5.2f:none:Visual magnitude of the asteroid.

Parameters in least squares solution.
X_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the X-coordinate of the center of the fitted ellipse on the fundamental plane.
Y_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the Y-coordinate of the center of the fitted ellipse on the fundamental plane.
Major_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the Major axis of fitted ellipse.
Minor_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the Minor axis of fitted ellipse.
Major_PA_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the Position angle of the major axis of the ellipse.
CIRC_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations is limited to the fit of a circle.
MISS_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations has regard to close 'Miss' chords.
STAR_SEP_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the separation of a 2nd component of the star.
STAR_PA_FLAG:ASCII_Integer::none:0 = false, 1 = true. Least-squares fit to the observations includes the position angle of a 2nd component of the star.

Ellipse location fields.
ELLIPSE_CENTER_X:ASCII_Real::km:X-coordinate of the center of the best-fit ellipse relative to the reference frame used to plot the observations.
ELLIPSE_CENTER_Y:ASCII_Real::km:Y-coordinate of the center of the best-fit ellipse relative to the reference frame used to plot the observations.
Major_AXIS:ASCII_Real::km:Length of the major axis of the fitted ellipse.
Minor_AXIS:ASCII_Real::km:Length of the minor axis of the fitted ellipse.
Major_AXIS_PA:ASCII_Real:%5.1f:deg:Position angle of the major axis of the fitted ellipse.
FIT_QUAL_CODE:ASCII_Integer::none:A code indicating the quality of the fit. Values are;~0 = 'No reliable position or size'~1 = 'Astrometry only. No reliable size' Observation can be used to report astrometry, but nothing meaningful about the asteroid's size.~2 = 'Limits on size, but no shape'. Poor coverage around the profile, but a diameter is determinable (often with a fit to a shape model)~3 = 'Reliable size. Can fit to shape models'. Good coverage around much of the profile enabling a reliable determination of the asteroid's size - even without a shape model~4 = 'Resolution better than shape models'. Profile of the asteroid well covered with highly consistent results.~5 = 'No astrometry AOTA2B = Possible'. For events where there is only one positive chord, and the duration of the potential occultation is one or two video frames or camera exposures. The AOTA2B test compares the light drop of a suspected event to other light drops in the light curve, and allocates a rating of Probable, Possible, or Unlikely, This setting is for when the Rating for such an event is 'Possible'. Such events are not used for any reporting process.~6 = 'Only one star of a double. No astrometry'. Used when the magnitude drop is much less than expected, and can only be explained by it being an occultation of one component of a double star. No astrometry is reported, as the location of the photocenter of the double star (which would equate to the Gaia star position) is unknown.
USED_ASSUMED_DIA_FLAG:ASCII_Integer::none:0 = false, 1 = true. Indicates the solution is based on a circle (CIRC_FLAG = true) using AST_DIA_NOMINAL.
REVIEW_FLAG:ASCII_Integer::none:Flags to indicate the event should be reviewed in the future because of particular issues that might be resolved with further information. Values are cumulative. The values and meaning are~1  unspecified reasons~2  Possible double star~4  Possible satellite

uncertainties in ellipse fit fields.
ELLIPSE_CENTER_X_UNCERT:ASCII_Real::km:Standard deviation of the solution for ELLIPSE_CENTER_X.
ELLIPSE_CENTER_Y_UNCERT:ASCII_Real::km:Standard deviation of the solution for ELLIPSE_CENTER_Y.
Major_AXIS_UNCERT:ASCII_Real::km:Standard deviation of the solution for Major_AXIS.
Minor_AXIS_UNCERT:ASCII_Real::km:Standard deviation of the solution for Minor_AXIS.
Major_AXIS_PA_UNCERT:ASCII_Real::deg:Standard deviation of the solution for Major_AXIS_PA.

Shape model fields.
SHAPE_SRC_1:UTF8_String::none:Shape model source. ~DAMIT = Database of Asteroid Models from Inversion Techniques ~ISAM = Interactive Service for Asteroid Models.
SHAPE_ID_1:UTF8_String::none:Identification of the model in SHAPE_SRC_1. For ISAM, the number after 'A' is the asteroid number.
SHAPE_SURFVOL_1:ASCII_Real:%5.3f:none:Ratio of the Surface-equivalent diameter to the Volume-equivalent diameter of the shape model.
SHAPE_FIT_QUAL_1:ASCII_Integer::none:Quality of the fit of the observations to SHAPE_SRC_1 ~0 = 'Not fitted' ~1 = 'Bad occultation data' ~2 = 'Model wrong' ~3 = 'Minimum diameter (no limit on the maximum diameter)' ~4 = 'Diameter but no fit' ~5 = 'Poor fit' ~6 = 'Good fit' ~7 = 'Not constrained'.
SHAPE_FIT_PHASE_1:ASCII_Real:%3.0f:deg:Rotational correction applied to optimize the fit. Only applied if the light curve data warrants such an adjustment.
SHAPE_MIN_DIA_1:ASCII_Real::km:Minimum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_1.
SHAPE_MAX_DIA_1:ASCII_Real::km:Maximum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_1.
SHAPE_VERSION_1:UTF8_String::none:Version information from the SHAPE_SRC_1.
SHAPE_SRC_2:UTF8_String::none:Shape model source. ~DAMIT = Database of Asteroid Models from Inversion Techniques ~ISAM = Interactive Service for Asteroid Models.
SHAPE_ID_2:UTF8_String::none:Identification of the model in SHAPE_SRC_2. For ISAM, the number after 'A' is the asteroid number.
SHAPE_SURFVOL_2:ASCII_Real:%5.3f:none:Ratio of the Surface-equivalent diameter to the Volume-equivalent diameter of the shape model.
SHAPE_FIT_QUAL_2:ASCII_Integer::none:Quality of the fit of the observations to SHAPE_SRC_2 ~0 = 'Not fitted' ~1 = 'Bad occultation data' ~2 = 'Model wrong' ~3 = 'Minimum diameter (no limit on the maximum diameter)' ~4 = 'Diameter but no fit' ~5 = 'Poor fit' ~6 = 'Good fit' ~7 = 'Not constrained'.
SHAPE_FIT_PHASE_2:ASCII_Real:%3.0f:deg:Rotational correction applied to optimize the fit. Only applied if the light curve data warrants such an adjustment.
SHAPE_MIN_DIA_2:ASCII_Real::km:Minimum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_2.
SHAPE_MAX_DIA_2:ASCII_Real::km:Maximum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_2.
SHAPE_VERSION_2:UTF8_String::none:Version information from the SHAPE_SRC_2.
SHAPE_SRC_3:UTF8_String::none:Shape model source. ~DAMIT = Database of Asteroid Models from Inversion Techniques ~ISAM = Interactive Service for Asteroid Models.
SHAPE_ID_3:UTF8_String::none:Identification of the model in SHAPE_SRC_3. For ISAM, the number after 'A' is the asteroid number.
SHAPE_SURFVOL_3:ASCII_Real:%5.3f:none:Ratio of the Surface-equivalent diameter to the Volume-equivalent diameter of the shape model.
SHAPE_FIT_QUAL_3:ASCII_Integer::none:Quality of the fit of the observations to SHAPE_SRC_3 ~0 = 'Not fitted' ~1 = 'Bad occultation data' ~2 = 'Model wrong' ~3 = 'Minimum diameter (no limit on the maximum diameter)' ~4 = 'Diameter but no fit' ~5 = 'Poor fit' ~6 = 'Good fit' ~7 = 'Not constrained'.
SHAPE_FIT_PHASE_3:ASCII_Real:%3.0f:deg:Rotational correction applied to optimize the fit. Only applied if the light curve data warrants such an adjustment.
SHAPE_MIN_DIA_3:ASCII_Real::km:Minimum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_3.
SHAPE_MAX_DIA_3:ASCII_Real::km:Maximum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_3.
SHAPE_VERSION_3:UTF8_String::none:Version information from the SHAPE_SRC_3.
SHAPE_SRC_4:UTF8_String::none:Shape model source. ~DAMIT = Database of Asteroid Models from Inversion Techniques ~ISAM = Interactive Service for Asteroid Models.
SHAPE_ID_4:UTF8_String::none:Identification of the model in SHAPE_SRC_4. For ISAM, the number after 'A' is the asteroid number.
SHAPE_SURFVOL_4:ASCII_Real:%5.3f:none:Ratio of the Surface-equivalent diameter to the Volume-equivalent diameter of the shape model.
SHAPE_FIT_QUAL_4:ASCII_Integer::none:Quality of the fit of the observations to SHAPE_SRC_4 ~0 = 'Not fitted' ~1 = 'Bad occultation data' ~2 = 'Model wrong' ~3 = 'Minimum diameter (no limit on the maximum diameter)' ~4 = 'Diameter but no fit' ~5 = 'Poor fit' ~6 = 'Good fit' ~7 = 'Not constrained'.
SHAPE_FIT_PHASE_4:ASCII_Real:%3.0f:deg:Rotational correction applied to optimize the fit. Only applied if the light curve data warrants such an adjustment.
SHAPE_MIN_DIA_4:ASCII_Real::km:Minimum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_4.
SHAPE_MAX_DIA_4:ASCII_Real::km:Maximum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_4.
SHAPE_VERSION_4:UTF8_String::none:Version information from the SHAPE_SRC_4.
SHAPE_SRC_5:UTF8_String::none:Shape model source. ~DAMIT = Database of Asteroid Models from Inversion Techniques ~ISAM = Interactive Service for Asteroid Models.
SHAPE_ID_5:UTF8_String::none:Identification of the model in SHAPE_SRC_5. For ISAM, the number after 'A' is the asteroid number.
SHAPE_SURFVOL_5:ASCII_Real:%5.3f:none:Ratio of the Surface-equivalent diameter to the Volume-equivalent diameter of the shape model.
SHAPE_FIT_QUAL_5:ASCII_Integer::none:Quality of the fit of the observations to SHAPE_SRC_5 ~0 = 'Not fitted' ~1 = 'Bad occultation data' ~2 = 'Model wrong' ~3 = 'Minimum diameter (no limit on the maximum diameter)' ~4 = 'Diameter but no fit' ~5 = 'Poor fit' ~6 = 'Good fit' ~7 = 'Not constrained'.
SHAPE_FIT_PHASE_5:ASCII_Real:%3.0f:deg:Rotational correction applied to optimize the fit. Only applied if the light curve data warrants such an adjustment.
SHAPE_MIN_DIA_5:ASCII_Real::km:Minimum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_5.
SHAPE_MAX_DIA_5:ASCII_Real::km:Maximum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_5.
SHAPE_VERSION_5:UTF8_String::none:Version information from the SHAPE_SRC_5.
SHAPE_SRC_6:UTF8_String::none:Shape model source. ~DAMIT = Database of Asteroid Models from Inversion Techniques ~ISAM = Interactive Service for Asteroid Models.
SHAPE_ID_6:UTF8_String::none:Identification of the model in SHAPE_SRC_6. For ISAM, the number after 'A' is the asteroid number.
SHAPE_SURFVOL_6:ASCII_Real:%5.3f:none:Ratio of the Surface-equivalent diameter to the Volume-equivalent diameter of the shape model.
SHAPE_FIT_QUAL_6:ASCII_Integer::none:Quality of the fit of the observations to SHAPE_SRC_6 ~0 = 'Not fitted' ~1 = 'Bad occultation data' ~2 = 'Model wrong' ~3 = 'Minimum diameter (no limit on the maximum diameter)' ~4 = 'Diameter but no fit' ~5 = 'Poor fit' ~6 = 'Good fit' ~7 = 'Not constrained'.
SHAPE_FIT_PHASE_6:ASCII_Real:%3.0f:deg:Rotational correction applied to optimize the fit. Only applied if the light curve data warrants such an adjustment.
SHAPE_MIN_DIA_6:ASCII_Real::km:Minimum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_6.
SHAPE_MAX_DIA_6:ASCII_Real::km:Maximum volume-equivalent diameter of the asteroid from the fit to SHAPE_SRC_6.
SHAPE_VERSION_6:UTF8_String::none:Version information from the SHAPE_SRC_6.

Satellite #1 Fields.
SAT_NAME_1:UTF8_String::none:IAU designation of the satellite.  [Empty if not relevant, or no designation].
SAT_DRA_1:ASCII_Real:%5.1f:milliarcsec/hr:Linear motion in Right Ascension of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_DDEC_1:ASCII_Real:%5.1f:milliarcsec/hr:Linear motion in Declination of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_D2RA_1:ASCII_Real:%5.1f:milliarcsec/hr**2:Second-order motion in Right Ascension of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_D2DEC_1:ASCII_Real:%5.1f:milliarcsec/hr**2:Second-order motion in Declination of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_SEP_1:ASCII_Real::milliarcsec:Separation of the satellite from the center of the main body.
SAT_PA_1:ASCII_Real::deg:Position angle of the satellite from the center of the main body.
SAT_SEP_SD_1:ASCII_Real::milliarcsec:Uncertainty in separation of the satellite from the center of the main body.
SAT_PA_SD_1:ASCII_Real::deg:Uncertainty in position angle of the satellite from the center of the main body.
SAT_Major_1:ASCII_Real::km:Major axis of the satellite.
SAT_Minor_1:ASCII_Real::km:Minor axis of the satellite.
SAT_Major_PA_1:ASCII_Real::deg:Position angle of the major axis of the satellite.
SAT_FITQUALITY_1:ASCII_Integer::none:Fit quality.~0 = None. No fit to the satellite. This is only used when the observations indicate the detection of a satellite, but have not been analyzed to obtain a fit.~1 = Is it a satellite? The observations indicates the possibility of a satellite. However the observational evidence is not sufficient to assert a definite detection.~2 = Approximate offset. The existence of a satellite is reasonably definite. The approximate location of the satellite can be determined, but not its size or shape~3 = Offset + size. An accurate location of the satellite is determined, together with a size derived by assuming it is spherical~4 = Offset + shape. An accurate determination of the location, size and shape of the satellite.
CBET_1:UTF8_String::none:For discovery by occultation. The CBET (Central Bureau Electronic Telegram) number of the announcement

Satellite #2 Fields.
SAT_NAME_2:UTF8_String::none:IAU designation of the satellite .  [Empty if not relevant, or no designation].
SAT_DRA_2:ASCII_Real:%5.1f:milliarcsec/hr:Linear motion in Right Ascension of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_DDEC_2:ASCII_Real:%5.1f:milliarcsec/hr:Linear motion in Declination of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_D2RA_2:ASCII_Real:%5.1f:milliarcsec/hr**2:Second-order motion in Right Ascension of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_D2DEC_2:ASCII_Real:%5.1f:milliarcsec/hr**2:Second-order motion in Declination of the satellite relative to the Center of Mass, at TIME_ZERO.
SAT_SEP_2:ASCII_Real::milliarcsec:Separation of the satellite from the center of the main body.
SAT_PA_2:ASCII_Real::deg:Position angle of the satellite from the center of the main body.
SAT_SEP_SD_2:ASCII_Real::milliarcsec:Uncertainty in separation of the satellite from the center of the main body.
SAT_PA_SD_2:ASCII_Real::deg:Uncertainty in position angle of the satellite from the center of the main body.
SAT_Major_2:ASCII_Real::km:Major axis of the satellite.
SAT_Minor_2:ASCII_Real::km:Minor axis of the satellite.
SAT_Major_PA_2:ASCII_Real::deg:Position angle of the major axis of the satellite.
SAT_FITQUALITY_2:ASCII_Integer::none:Fit quality.~0 = None. No fit to the satellite. This is only used when the observations indicate the detection of a satellite, but have not been analyzed to obtain a fit.~1 = Is it a satellite? The observations indicates the possibility of a satellite. However the observational evidence is not sufficient to assert a definite detection.~2 = Approximate offset. The existence of a satellite is reasonably definite. The approximate location of the satellite can be determined, but not its size or shape~3 = Offset + size. An accurate location of the satellite is determined, together with a size derived by assuming it is spherical~4 = Offset + shape. An accurate determination of the location, size and shape of the satellite.
CBET_2:UTF8_String::none:For discovery by occultation. The CBET (Central Bureau Electronic Telegram) number of the announcement

Double Star fields.
DOUB_PA_SOLN_1:ASCII_Real:%5.1f:deg:Position angle of the secondary star.
DOUB_SEP_SOLN_1:UTF8_String::milliarcsec:Separation of the secondary star. Where the occultation is of one star only of a double star (demonstrated by the light drop being significantly less than expected, the value for the minimum possible separation is given as  >x.x
DOUB_PA_SD_SOLN_1:ASCII_Real:%5.1f:deg:Uncertainty in Position angle of the secondary star.
DOUB_SEP_SD_SOLN_1:ASCII_Real:%6.1f:milliarcsec:Uncertainty in Separation of the secondary star.
DOUB_CENTER_X_SOLN_1:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in X of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_CENTER_Y_SOLN_1:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in Y of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_OFFSET_X_SOLN_1:ASCII_Real::km:Displacement of the fitted ellipse in X from DOUB_CENTER_X_SOLN_1 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_1/DOUB_SEP_SOLN_1.
DOUB_OFFSET_Y_SOLN_1:ASCII_Real::km:Displacement of the fitted ellipse in Y from DOUB_CENTER_Y_SOLN_1 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_1/DOUB_SEP_SOLN_1.
DOUB_SOLUTION_ID_1:ASCII_Integer::none:Solution number.
DOUB_PA_SOLN_2:ASCII_Real:%5.1f:deg:Position angle of the secondary star.
DOUB_SEP_SOLN_2:ASCII_Real:%6.1f:milliarcsec:Separation of the secondary star.
DOUB_PA_SD_SOLN_2:ASCII_Real:%5.1f:deg:Uncertainty in Position angle of the secondary star.
DOUB_SEP_SD_SOLN_2:ASCII_Real:%5.1f:milliarcsec:Uncertainty in Separation of the secondary star.
DOUB_CENTER_X_SOLN_2:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in X of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_CENTER_Y_SOLN_2:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in Y of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_OFFSET_X_SOLN_2:ASCII_Real::km:Displacement of the fitted ellipse in X from DOUB_CENTER_X_SOLN_2 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_2/DOUB_SEP_SOLN_2.
DOUB_OFFSET_Y_SOLN_2:ASCII_Real::km:Displacement of the fitted ellipse in Y from DOUB_CENTER_Y_SOLN_2 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_2/DOUB_SEP_SOLN_2.
DOUB_SOLUTION_ID_2:ASCII_Integer::none:Solution number.
DOUB_PA_SOLN_3:ASCII_Real:%5.1f:deg:Position angle of the secondary star.
DOUB_SEP_SOLN_3:ASCII_Real:%6.1f:milliarcsec:Separation of the secondary star.
DOUB_PA_SD_SOLN_3:ASCII_Real:%5.1f:deg:Uncertainty in Position angle of the secondary star.
DOUB_SEP_SD_SOLN_3:ASCII_Real:%5.1f:milliarcsec:Uncertainty in Separation of the secondary star.
DOUB_CENTER_X_SOLN_3:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in X of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_CENTER_Y_SOLN_3:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in Y of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_OFFSET_X_SOLN_3:ASCII_Real::km:Displacement of the fitted ellipse in X from DOUB_CENTER_X_SOLN_3 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_3/DOUB_SEP_SOLN_3.
DOUB_OFFSET_Y_SOLN_3:ASCII_Real::km:Displacement of the fitted ellipse in Y from DOUB_CENTER_Y_SOLN_3 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_3/DOUB_SEP_SOLN_3.
DOUB_SOLUTION_ID_3:ASCII_Integer::none:Solution number.
DOUB_PA_SOLN_4:ASCII_Real:%5.1f:deg:Position angle of the secondary star.
DOUB_SEP_SOLN_4:ASCII_Real:%6.1f:milliarcsec:Separation of the secondary star.
DOUB_PA_SD_SOLN_4:ASCII_Real:%5.1f:deg:Uncertainty in Position angle of the secondary star.
DOUB_SEP_SD_SOLN_4:ASCII_Real:%5.1f:milliarcsec:Uncertainty in Separation of the secondary star.
DOUB_CENTER_X_SOLN_4:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in X of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_CENTER_Y_SOLN_4:ASCII_Real::km:Set when the location of the chord(s) against the asteroid profile is ambiguous. The mean location in Y of the center of the ellipse when fitted to the alternate location of the chord(s).
DOUB_OFFSET_X_SOLN_4:ASCII_Real::km:Displacement of the fitted ellipse in X from DOUB_CENTER_X_SOLN_4 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_4/DOUB_SEP_SOLN_4.
DOUB_OFFSET_Y_SOLN_4:ASCII_Real::km:Displacement of the fitted ellipse in Y from DOUB_CENTER_Y_SOLN_4 when the ellipse is aligned to fit the primary star for DOUB_PA_SOLN_4/DOUB_SEP_SOLN_4.
DOUB_SOLUTION_ID_4:ASCII_Integer::none:Solution number.
JDSO_SubmitDate:UTF8_String::none:Date of submission to the JDSO (Journal of Double Star Observations)
JDSO_Reference:UTF8_String::none:Publication reference in the JDSO (Journal of Double Star Observations)

Astrometry fields Main body.
EVENT_DATE:ASCII_Date_YMD::none:Date of the astrometric position from the event.
EVENT_HOUR:ASCII_Real::hr:Hour of the astrometric position from the event.
EVENT_TIME_UNCERT:ASCII_Real:%7.3f:s:Uncertainty in the time of the astrometric position from the event. It includes the along-path uncertainty caused by the Earth's rotation during the uncertainty interval.
EVENT_TIME_UNCERT_ACROSSPATH:ASCII_Real:%7.2f:milliarcsec:The across-path uncertainty caused by the Earth's rotation during the uncertainty interval.
IAU_DESIG_MAIN:UTF8_String::none:IAU identifier of the asteroid.
FPLANE_X_MAIN:UTF8_String::km:X coordinate of the Center of Figure on the fundamental plane. If POSN_ON_MODEL is true, this is a Center of Mass coordinate.
FPLANE_Y_MAIN:UTF8_String::km:Y coordinate on the Center of Figure on the fundamental plane  If POSN_ON_MODEL is true, this is a Center of Mass coordinate.
CENTER_MASS_X:UTF8_String::km:X Offset of the Center of Mass from the Center of Figure, on the fundamental plane.
CENTER_MASS_Y:UTF8_String::km:Y Offset of the Center of Mass from the Center of Figure, on the fundamental plane.
EQU_X_MAIN:ASCII_Real:%10.3f:km:Geocentric equatorial X coordinate of the location of the Center of Mass on the fundamental plane.
EQU_Y_MAIN:ASCII_Real:%10.3f:km:Geocentric equatorial Y coordinate of the location of the Center of Mass on the fundamental plane.
EQU_Z_MAIN:ASCII_Real:%10.3f:km:Geocentric equatorial Z coordinate of the location of the shadow axis on the fundamental plane.
DELTA_RACOSDEC_MAIN:ASCII_Real:%8.4f:arcsec:Geocentric offset of the asteroid from the star in Right Ascension, GCRS J2000   [ STAR_RA + DOUBLE_SOLN_RA_OFFSET ].
DELTA_DEC_MAIN:ASCII_Real:%8.4f:arcsec:Geocentric offset of the asteroid from the star in Declination, GCRS J2000   [ STAR_DEC + DOUBLE_SOLN_DEC_OFFSET ].
RA_UNCERT_MAIN:ASCII_Real:%6.4f:arcsec:Uncertainty in DELTA_RACOSDEC_MAIN, including the effect of EVENT_TIME_UNCERT.
DEC_UNCERT_MAIN:ASCII_Real:%6.4f:arcsec:Uncertainty in DELTA_DEC_MAIN, including the effect of EVENT_TIME_UNCERT.
POSN_ON_MODEL:ASCII_Integer::none:0 = false, 1 = true. Astrometric position is based on the center of volume of a fitted shape model. ~NOTE. This setting is only set if both CENTRE_MASS_X and CENTER_MASS_Y  are non-zero.
CHORD_NUM_MAIN:ASCII_Integer::none:Number of positive chords used in the astrometric solution.
NOT_SEEN_MAIN:ASCII_Integer::none:0 = false, 1 = true. When this flag is true, Astrometry for the Main body must not be used. This setting is True when an occultation by a satellite is observed, but there is no observation of the Main body. The position of the Main body is an artificial position, typically set on the basis of a prediction. The Astrometric position of the Satellite is a combination of the offset of the Satellite from this artificial position and the astrometric position of this artificial position.
FIT_CODE_MAIN:UTF8_String::none:A code that sets out the corrections made to RA_UNCERT_MAIN and DEC_UNCERT_MAIN to incorporate a range of factors that affect the uncertainty. The code has 20 values; the codes and their meaning is explained in the PACKAGE DESCRIPTION file, under the heading 'Astrometric uncertainties - Error Code'.
ACROSS_PATH_UNCERT_ADJUST_MAIN:ASCII_Real:%8.1f:km:The numerical increase in the uncertainty from (ELLIPSE_CENTER_X_UNCERT, ELLIPSE_CENTER_Y_UNCERT) as resolved in the Across-path direction, arising from the considerations under FIT_CODE_MAIN.
ALONG_PATH_UNCERT_ADJUST_MAIN:ASCII_Real:%8.1f:km:The numerical increase in the uncertainty from (ELLIPSE_CENTER_X_UNCERT, ELLIPSE_CENTER_Y_UNCERT) as resolved in the Along-path direction, arising from the considerations under FIT_CODE_MAIN.
MAX_HIT_PLUS:ASCII_Real:%5.2f:none:Distance of the observed chord most distant from the center of the fitted ellipse in the +'ve direction, in asteroid radii. 0 = no Hit Plus chord.
MAX_HIT_MINUS:ASCII_Real:%5.2f:none:Distance of the observed chord most distant from the center of the fitted ellipse in the -'ve direction, in asteroid radii.  0 = no Hit Minus chord.
MIN_MISS_PLUS:ASCII_Real:%5.2f:none:Distance of the Miss chord closest the center of the fitted ellipse in the +'ve direction, in asteroid radii. 9 = no Miss Plus chord.
MIN_MISS_MINUS:ASCII_Real:%5.2f:none:Distance of the Miss chord closest to the center of the fitted ellipse in the -'ve direction, in asteroid radii. 9 = no Miss Minus chord.

Main at conjunction.
CONJ_IAU_DESIG_MAIN:UTF8_String::none:IAU identifier of the asteroid.
CONJ_GEO_X_MAIN:UTF8_String::km:X coordinate on the fundamental plane at geocentric conjunction.
CONJ_GEO_Y_MAIN:UTF8_String::km:Y coordinate on the fundamental plane at geocentric conjunction.
CONJ_DATE_MAIN:ASCII_Date_YMD::none:Date of Geocentric conjunction.
CONJ_PARTDAY_MAIN:ASCII_Real:%9.7f:day:Fraction of the day at conjunction.
CONJ_PARTDAY_UNCERT_MAIN:ASCII_Real:%9.7f:day:Uncertainty in the time of conjunction.
CONJ_ALONGPATH_UNCERT:ASCII_Real::milliarcsec:Uncertainty in the Along-path direction of the center of the asteroid's shadow on the fundamental plane, NOT including the effect of EVENT_TIME_UNCERT.
CONJ_SEP_MAIN:ASCII_Real:%9.4f:arcsec:Separation from the star at conjunction.
CONJ_UNCERT_SEP_MAIN:ASCII_Real::milliarcsec:Uncertainty in the separation at conjunction.
CONJ_PA_MAIN:ASCII_Real:%8.3f:deg:Position angle at conjunction, in GCRS J2000.
CONJ_NOT_SEEN_MAIN:ASCII_Integer::none:0 = false, 1 = true. When this flag is true, Astrometry for the Main body must not be used. This setting is True when an occultation by a satellite is observed, but there is no observation of the Main body. The position of the Main body is an artificial position, typically set on the basis of a prediction. The Astrometric position of the Satellite is a combination of the offset of the Satellite from this artificial position and the astrometric position of this artificial position.

Astrometry field Satellite #1.
IAU_DESIG_SAT1:UTF8_String::none:IAU identifier of the first satellite.
FPLANE_X_SAT1:UTF8_String::km:X coordinate on the fundamental plane.
FPLANE_Y_SAT1:UTF8_String::km:Y coordinate on the fundamental plane.
EQU_X_SAT1:ASCII_Real:%10.3f:km:Geocentric equatorial X coordinate of the location of the shadow axis on the fundamental plane.
EQU_Y_SAT1:ASCII_Real:%10.3f:km:Geocentric equatorial Y coordinate of the location of the shadow axis on the fundamental plane.
EQU_Z_SAT1:ASCII_Real:%10.3f:km:Geocentric equatorial Z coordinate of the location of the shadow axis on the fundamental plane.
PA_SAT1:ASCII_Real::deg:Position angle of the satellite relative to the main body, GCRS J2000.
DELTA_RACOSDEC_SAT1:ASCII_Real:%9.4f:arcsec:Geocentric offset of the satellite from the star in Right Ascension, GCRS J2000  [ STAR_RA + DOUBLE_SOLN_RA_OFFSET ].
DELTA_DEC_SAT1:ASCII_Real:%9.4f:arcsec:Geocentric offset of the satellite from the star in Declination, GCRS J2000  [ STAR_DEC + DOUBLE_SOLN_DEC_OFFSET ].
RA_UNCERT_SAT1:ASCII_Real:%6.4f:arcsec:Uncertainty in DELTA_RACOSDEC_SAT1, including the effect of EVENT_TIME_UNCERT.
DEC_UNCERT_SAT1:ASCII_Real:%6.4f:arcsec:Uncertainty in DELTA_DEC_SAT1, including the effect of EVENT_TIME_UNCERT.
CHORD_NUM_SAT1:ASCII_Integer::none:Number of positive chords of SAT1 used in the solution.
CONJ_IAU_DESIG_SAT1:UTF8_String::none:IAU identifier of the first satellite.
MOTION_SAT1:ASCII_Integer::none:0 = false, 1 = true. Motion of SAT1 from Miriade included in solution.
CONJ_GEO_X_SAT1:ASCII_Real::km:X coordinate on the fundamental plane at geocentric conjunction.
CONJ_GEO_Y_SAT1:ASCII_Real::km:Y coordinate on the fundamental plane at geocentric conjunction.
CONJ_DATE_SAT1:ASCII_Date_YMD::none:Date of geocentric conjunction.
CONJ_PARTDAY_SAT1:ASCII_Real:%9.7f:day:Fraction of the day at conjunction.
CONJ_PARTDAY_UNCERT_SAT1:ASCII_Real:%9.7f:day:Uncertainty in the time of conjunction.
CONJ_ALONGPATH_UNCERT_SAT1:ASCII_Real:%6.1f:milliarcsec:Uncertainty in the along-path direction of the center of the asteroid's shadow on the fundamental plane.
CONJ_SEP_SAT1:ASCII_Real:%9.4f:arcsec:Separation from the star at conjunction.
CONJ_ACROSSPATH_UNCERT_SAT1:ASCII_Real:%6.1f:milliarcsec:Uncertainty in the across-path direction of the center of the asteroid's shadow on the fundamental plane.
PA_CONJUNCTION_SAT1:ASCII_Real:%8.3f:deg:Position angle at conjunction, in GCRS J2000.

Astrometry field Satellite #2.
IAU_DESIG_SAT2:UTF8_String::none:IAU identifier of the second satellite.
FPLANE_X_SAT2:UTF8_String::km:X coordinate on the fundamental plane.
FPLANE_Y_SAT2:UTF8_String::km:Y coordinate on the fundamental plane.
EQU_X_SAT2:ASCII_Real:%10.3f:km:Geocentric equatorial X coordinate of the location of the shadow axis on the fundamental plane.
EQU_Y_SAT2:ASCII_Real:%10.3f:km:Geocentric equatorial Y  coordinate of the location of the shadow axis on the fundamental plane.
EQU_Z_SAT2:ASCII_Real:%10.3f:km:Geocentric equatorial Z coordinate of the location of the shadow axis on the fundamental plane.
PA_SAT2:ASCII_Real::deg:Position angle of the satellite relative to the main body, GCRS J2000.
DELTA_RACOSDEC_SAT2:ASCII_Real:%9.4f:arcsec:Geocentric offset of the satellite from the star in Right Ascension, GCRS J2000  [ STAR_RA + DOUBLE_SOLN_RA_OFFSET ].
DELTA_DEC_SAT2:ASCII_Real:%9.4f:arcsec:Geocentric offset of the satellite from the star in Declination, GCRS J2000    [ STAR_DEC + DOUBLE_SOLN_DEC_OFFSET ].
RA_UNCERT_SAT2:ASCII_Real:%6.4f:arcsec:Uncertainty in DELTA_RACOSDEC_SAT2, including the effect of EVENT_TIME_UNCERT.
DEC_UNCERT_SAT2:ASCII_Real:%6.4f:arcsec:Uncertainty in DELTA_DEC_SAT2, including the effect of EVENT_TIME_UNCERT.
CHORD_NUM_SAT2:ASCII_Integer::none:Number of positive chords of SAT2 used in the solution.
CONJ_IAU_DESIG_SAT2:UTF8_String::none:IAU identifier of the second satellite.
MOTION_SAT2:ASCII_Integer::none:0 = false, 1 = true. Motion of SAT2 from Miriade included in solution.
CONJ_GEO_X_SAT2:ASCII_Real::km:X coordinate on the fundamental plane at geocentric conjunction.
CONJ_GEO_Y_SAT2:ASCII_Real::km:Y coordinate on the fundamental plane at geocentric conjunction.
CONJ_DATE_SAT2:ASCII_Date_YMD::none:Date of geocentric conjunction.
CONJ_PARTDAY_SAT2:ASCII_Real:%9.7f:day:Fraction of the day at conjunction.
CONJ_PARTDAY_UNCERT_SAT2:ASCII_Real:%9.7f:day:Uncertainty in the time of conjunction.
CONJ_ALONGPATH_UNCERT_SAT2:ASCII_Real:%6.1f:milliarcsec:Uncertainty in the along-path direction of the center of the asteroid's shadow on the fundamental plane.
CONJ_SEP_SAT2:ASCII_Real:%9.4f:arcsec:Separation from the star at conjunction.
CONJ_ACROSSPATH_UNCERT_SAT2:ASCII_Real:%6.1f:milliarcsec:Uncertainty in the across-path direction of the center of the asteroid's shadow on the fundamental plane.
PA_CONJUNCTION_SAT2:ASCII_Real:%8.3f:deg:Position angle at conjunction, in GCRS J2000.

MPC and edit fields.
MPC_DATE:UTF8_String::none:The date of submission/acceptance of the astrometry to the Minor Planet Center.
MPC_NUMBER:ASCII_Integer::none:Minor Planet Circular number.
MPC_SubmissionID:UTF8_String::none:Unique ObservationID allocated by the Minor Planet Center when an astrometric position is accepted. For observations submitted in 2024 February, this field is set to 'Not known'
DATE_ADDED:ASCII_Date_YMD::none:Date when the record was added.
DATE_EDITED:ASCII_Date_YMD::none:Date when the record was last edited.
