Occultation event with (22149) 00WD49, event index number 1721
Regions able to see the event: Senegal
Geocentric closest approach at 2025/12/26 04:51:16 UTC
J2000 position of star is 11:57:30.7 -21:07:55
Equinox of date position of star is 11:58:50.5 -21:16:36
Star is 150 degrees from the moon. Moon is 33% illuminated.
Stellar brightness G=10.3, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 51.7 per integration for unocculted signal
Expected flux drop is 99% with SNR of 51.4 for the occulted depth (per occulted point)
Apparent velocity is 19.0 km/sec on the sky relative to the star, or, 19.2 arcsec/hr.
Position angle of asteroid motion is 151.7 degrees
The recommended exposure time corresponds to 2.3 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 1.4 km.
The sky-plane scale is 3563.0 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, aximum of 2.7 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 22149_00WD49, (2025/12/26 04:51UT) Object RA Dec mag sep mel Spica 13:26:33.9 -11:17:46 1.0 23.26 141 4Gam Crv 12:17:08.8 -17:41:10 2.6 5.61 151 PPM 225249 12:02:11.1 -19:48:13 5.4 1.67 151 PPM 259745 12:02:17.2 -21:23:44 8.3 0.81 150 PPM 259687 11:59:15.2 -21:28:18 8.7 0.22 150 PPM 259680 11:58:49.1 -21:26:56 10.1 0.17 150 22149_00WD49 11:58:50.5 -21:16:36 15.8 150 Positions are for equinox of date
Star training set for 22149_00WD49, (2025/12/26 04:51UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 23.26 141 4Gam Crv 12:15:48.1 -17:32:30 2.6 5.61 151 PPM 225249 12:00:51.1 -19:39:32 5.4 1.67 151 PPM 259745 12:00:57.2 -21:15:04 8.3 0.81 150 PPM 259687 11:57:55.4 -21:19:37 8.7 0.22 150 PPM 259680 11:57:29.3 -21:18:15 10.1 0.17 150 22149_00WD49 11:57:30.7 -21:07:55 15.8 150 Positions are for J2000