Lunar Grazing Occultation Maps for North America for 2022 - New 2021 August 9

by Eberhard Riedel

Below are links to maps and data for the brighter lunar grazing 
occultations in North America during 2022. There are 6 maps of 
populated parts of North America showing grazing occultations of 
stars brighter than mag. 7.5, and some fainter during total lunar 
eclipses, that should be visible with small telescopes.

In the maps, the lines are dotted, dashed, or solid: 

- nighttime dark limb: solid lines

- nighttime bright limb: dotted lines (large dots for very 
                                            bright objects)

- daytime dark- and bright limb: small dots (vertical dashes 
                                    for very bright objects)

I use thick lines for all occulted bodies 1.5 mag. and brighter,
and for major planets, regardless of their magnitude.

Much information about observing occultations of all types is in 
"Chasing the Shadow:  The IOTA Occultation Observer's Manual" 
available for free download here.

Grazing occultations in North America during 2022 to mag. 7.5


Here are the maps: 

Map, Jan. 1 - Feb. 15
Map, Feb. 16 - April 30
Map, May 1 - June 30
Map, July 1 - Sept. 15
Map, Sept. 16 - Oct. 31
Map, Nov. 1 - Dec. 31

Path data

These maps, table, and path data were published previously in 
the RASC Observer's Handbook, for example, on pages 174-178 of 
the 2021 Handbook. But starting with 2022, only one map of the 
brighter grazes for the whole year will be published, while
these maps for over 200 grazes of stars of mag. 7.5 and 
brighter (but some fainter, to mag. 10.0, during total lunar 
eclipses) will be provided online, only at this Web site. 
During the gibbous phases, when glare is strong, especially 
near full moon, magnitude limits brighter than 7.5 are used.
A page like this for North American grazes during 2021 is here.

On the maps, time tick marks are on the north side of southern 
limits and on the south side of northern limits, that is, on 
the side of the limit that has a total occultation. The tick 
marks are at integral 10-minute intervals of U.T., with the 
U.T. at the western end of the path being given in the table.
The Moon's shadow always moves from west to east across the map.
The paths end in "A" when the altitude above the horizon equals 
the star's or planet's magnitude, and it ends in "S" if the Sun 
altitude equals the negative of the star's magnitude. The path 
ends in "B" if the graze goes onto the sunlit side of the Moon.

Predictions of grazing occultations during 2022 within 200 miles of 
Blue Springs, Missouri during 2022 are here.

Other information described below is on Bob Sandy's page of the main IOTA Web site.
These include predictions of total lunar occultations for 40 major 
North American cities, a list of all known successful grazing 
occultation expeditions, as published in Occultation Newsletter, 
that were conducted between 1974 and 1986.  Reduction profiles 
(plots of the observations relative to Watts' charts of the edge of 
the Moon), most prepared by Bob Sandy, are also available for many 
of the larger graze expeditions.

Dr. Eberhard Riedel 
IOTA-ES Public Relations 
Mobile +49 179 1253558 

Page set up by David Dunham
Cell phone 301-526-5590