Occultation event with (1583) Antilochus, event index number 3791
Regions able to see the event: Australia
Geocentric closest approach at 2026/06/13 10:52:24 UTC
J2000 position of star is 12:39:09.1 -14:39:07
Equinox of date position of star is 12:40:32.0 -14:47:49
Star is 136 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=14.1
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 19% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 9.9 km/sec on the sky relative to the star, or, 10.0 arcsec/hr.
Position angle of asteroid motion is 21.6 degrees
The recommended exposure time corresponds to 19.8 km per image.
The 1-sigma error in the time of the event is 3.3 seconds.
The 1-sigma cross-track error in the shadow position is 11.1 km.
The sky-plane scale is 3570.6 km/arcsec.
Diameter estimates:
116.4 km assuming a 5% albedo, maximum of 11.8 sec for a central chord
47.5 km assuming a 30% albedo, maximum of 4.8 sec for a central chord
Cross-track diameter of 108.8 km used for deployment plan.
Star training set for 1583_Antilochus, (2026/06/13 10:52UT) Object RA Dec mag sep mel Spica 13:26:35.4 -11:17:55 1.0 11.75 145 4Gam Crv 12:17:10.2 -17:41:19 2.6 6.31 132 PPM 226198 12:42:38.5 -13:09:32 6.0 1.72 136 PPM 226115 12:39:03.5 -15:00:00 8.5 0.41 136 PPM 226145 12:40:33.5 -14:24:52 9.5 0.38 136 1583_Antilochu 12:40:32.0 -14:47:49 14.1 137 Positions are for equinox of date
Star training set for 1583_Antilochus, (2026/06/13 10:52UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 11.75 145 4Gam Crv 12:15:48.1 -17:32:30 2.6 6.31 132 PPM 226198 12:41:15.6 -13:00:51 6.0 1.72 136 PPM 226115 12:37:40.6 -14:51:17 8.5 0.41 136 PPM 226145 12:39:10.6 -14:16:10 9.5 0.38 136 1583_Antilochu 12:39:09.1 -14:39:07 14.1 136 Positions are for J2000