Occultation event with (22149) 00WD49, event index number 3676
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/04/22 23:42:00 UTC
J2000 position of star is 11:20:46.1 -23:17:21
Equinox of date position of star is 11:22:04.5 -23:26:01
Star is 76 degrees from the moon. Moon is 38% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 12.0 per integration for unocculted signal
Expected flux drop is 90% with SNR of 10.8 for the occulted depth (per occulted point)
Apparent velocity is 12.8 km/sec on the sky relative to the star, or, 15.3 arcsec/hr.
Position angle of asteroid motion is 136.3 degrees
The recommended exposure time corresponds to 1.5 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 6.0 km.
The sky-plane scale is 3009.1 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, maximum of 4.1 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 22149_00WD49, (2026/04/22 23:42UT) Object RA Dec mag sep mel Spica 13:26:35.0 -11:17:52 1.0 31.99 96 4Gam Crv 12:17:09.8 -17:41:16 2.6 14.11 84 11Bet Crt 11:12:57.3 -22:58:12 4.5 2.15 74 PPM 258875 11:22:09.8 -23:21:47 8.2 0.07 76 22149_00WD49 11:22:04.5 -23:26:01 15.2 76 Positions are for equinox of date
Star training set for 22149_00WD49, (2026/04/22 23:42UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 31.99 96 4Gam Crv 12:15:48.1 -17:32:30 2.6 14.11 84 11Bet Crt 11:11:39.5 -22:49:36 4.5 2.15 74 PPM 258875 11:20:51.4 -23:13:07 8.2 0.07 76 22149_00WD49 11:20:46.1 -23:17:21 15.2 76 Positions are for J2000