Occultation event with (1583) Antilochus, event index number 1578
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/24 10:10:03 UTC
J2000 position of star is 12:44:51.8 -19:52:15
Equinox of date position of star is 12:46:13.9 -20:00:44
Star is 89 degrees from the moon. Moon is 15% illuminated.
Stellar brightness G=12.9, apparent brightess of occulting body is G=14.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 11.8 per integration for unocculted signal
Expected flux drop is 81% with SNR of 9.6 for the occulted depth (per occulted point)
Apparent velocity is 32.7 km/sec on the sky relative to the star, or, 27.1 arcsec/hr.
Position angle of asteroid motion is 112.9 degrees
The recommended exposure time corresponds to 3.9 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 32.6 km.
The sky-plane scale is 4344.0 km/arcsec.
Diameter estimates:
116.4 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
47.5 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 108.8 km used for deployment plan.
Star training set for 1583_Antilochus, (2025/11/24 10:10UT) Object RA Dec mag sep mel Spica 13:26:33.7 -11:17:44 1.0 13.04 84 9Bet Crv 12:35:45.2 -23:32:23 2.6 4.28 89 PPM 226209 12:43:11.0 -19:54:02 6.1 0.72 89 PPM 260765 12:46:54.9 -20:17:13 8.0 0.32 88 PPM 226291 12:46:15.8 -20:03:27 8.6 0.05 89 1583_Antilochu 12:46:13.9 -20:00:44 14.5 88 Positions are for equinox of date
Star training set for 1583_Antilochus, (2025/11/24 10:10UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 13.04 84 9Bet Crv 12:34:23.2 -23:23:50 2.6 4.28 89 PPM 226209 12:41:49.1 -19:45:32 6.1 0.72 89 PPM 260765 12:45:32.7 -20:08:45 8.0 0.32 88 PPM 226291 12:44:53.7 -19:54:58 8.6 0.05 89 1583_Antilochu 12:44:51.8 -19:52:15 14.5 89 Positions are for J2000