Occultation event with (1583) Antilochus, event index number 3540
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/03/30 04:13:59 UTC
J2000 position of star is 12:59:38.3 -21:24:28
Equinox of date position of star is 13:01:02.6 -21:32:56
Star is 49 degrees from the moon. Moon is 91% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=13.6
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 23% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 18.2 km/sec on the sky relative to the star, or, 20.4 arcsec/hr.
Position angle of asteroid motion is 125.9 degrees
The recommended exposure time corresponds to 24.6 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 29.7 km.
The sky-plane scale is 3207.0 km/arcsec.
Diameter estimates:
116.4 km assuming a 5% albedo, maximum of 6.4 sec for a central chord
47.5 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 108.8 km used for deployment plan.
Star training set for 1583_Antilochus, (2026/03/30 04:14UT) Object RA Dec mag sep mel Spica 13:26:34.8 -11:17:51 1.0 11.94 49 9Bet Crv 12:35:46.3 -23:32:29 2.6 6.17 46 PPM 261160 13:05:10.7 -20:43:25 5.5 1.27 49 PPM 261108 13:02:22.1 -21:34:02 8.0 0.31 49 PPM 261084 13:01:13.3 -21:31:36 9.1 0.05 49 1583_Antilochu 13:01:02.6 -21:32:56 13.6 49 Positions are for equinox of date
Star training set for 1583_Antilochus, (2026/03/30 04:14UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 11.94 49 9Bet Crv 12:34:23.2 -23:23:50 2.6 6.17 46 PPM 261160 13:03:46.4 -20:35:00 5.5 1.27 49 PPM 261108 13:00:57.7 -21:25:35 8.0 0.31 49 PPM 261084 12:59:49.0 -21:23:08 9.1 0.05 49 1583_Antilochu 12:59:38.3 -21:24:28 13.6 49 Positions are for J2000