Occultation event with (1583) Antilochus, event index number 3482
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/22 01:39:07 UTC
J2000 position of star is 13:03:22.7 -22:00:30
Equinox of date position of star is 13:04:47.2 -22:08:55
Star is 160 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=13.7
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 32% with SNR of 3.2 for the occulted depth (per occulted point)
Apparent velocity is 16.6 km/sec on the sky relative to the star, or, 18.5 arcsec/hr.
Position angle of asteroid motion is 123.3 degrees
The recommended exposure time corresponds to 11.7 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.1 km.
The sky-plane scale is 3235.5 km/arcsec.
Diameter estimates:
116.4 km assuming a 5% albedo, maximum of 7.0 sec for a central chord
47.5 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 108.8 km used for deployment plan.
Star training set for 1583_Antilochus, (2026/03/22 01:39UT) Object RA Dec mag sep mel Spica 13:26:34.7 -11:17:50 1.0 12.04 162 9Bet Crv 12:35:46.2 -23:32:29 2.6 6.83 153 PPM 261160 13:05:10.6 -20:43:25 5.5 1.43 160 PPM 261192 13:07:00.5 -22:12:42 7.6 0.52 160 PPM 261173 13:05:53.6 -21:45:00 9.3 0.47 160 1583_Antilochu 13:04:47.2 -22:08:55 13.7 160 Positions are for equinox of date
Star training set for 1583_Antilochus, (2026/03/22 01:39UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 12.04 162 9Bet Crv 12:34:23.2 -23:23:50 2.6 6.83 153 PPM 261160 13:03:46.4 -20:35:00 5.5 1.43 160 PPM 261192 13:05:35.8 -22:04:18 7.6 0.52 160 PPM 261173 13:04:29.1 -21:36:36 9.3 0.47 160 1583_Antilochu 13:03:22.7 -22:00:30 13.7 160 Positions are for J2000