Occultation event with (22149) 00WD49, event index number 1700
Regions able to see the event: Australia
Geocentric closest approach at 2025/12/19 18:23:17 UTC
J2000 position of star is 11:55:35.4 -20:23:24
Equinox of date position of star is 11:56:55.0 -20:32:04
Star is 76 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 5.3 per integration for unocculted signal
Expected flux drop is 60% with SNR of 3.2 for the occulted depth (per occulted point)
Apparent velocity is 21.4 km/sec on the sky relative to the star, or, 21.2 arcsec/hr.
Position angle of asteroid motion is 146.2 degrees
The recommended exposure time corresponds to 11.8 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 2.1 km.
The sky-plane scale is 3631.8 km/arcsec.
Diameter estimates:
52.0 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
21.2 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 48.2 km used for deployment plan.
Star training set for 22149_00WD49, (2025/12/19 18:23UT) Object RA Dec mag sep mel Spica 13:26:33.9 -11:17:46 1.0 23.41 61 4Gam Crv 12:17:08.7 -17:41:09 2.6 5.56 73 PPM 225249 12:02:11.1 -19:48:13 5.4 1.44 76 PPM 259710 12:00:30.1 -20:30:05 8.0 0.84 76 PPM 259627 11:56:13.5 -20:38:53 9.8 0.20 77 PPM 259637 11:56:42.4 -20:43:07 10.4 0.19 76 22149_00WD49 11:56:55.0 -20:32:04 15.8 76 Positions are for equinox of date
Star training set for 22149_00WD49, (2025/12/19 18:23UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 23.41 61 4Gam Crv 12:15:48.1 -17:32:30 2.6 5.56 73 PPM 225249 12:00:51.1 -19:39:32 5.4 1.44 76 PPM 259710 11:59:10.3 -20:21:25 8.0 0.84 76 PPM 259627 11:54:53.9 -20:30:13 9.8 0.20 77 PPM 259637 11:55:22.8 -20:34:27 10.4 0.19 76 22149_00WD49 11:55:35.4 -20:23:24 15.8 76 Positions are for J2000