Occultation event with (2920) Automedon, event index number 3849
Regions able to see the event: Australia
Geocentric closest approach at 2026/07/15 09:26:38 UTC
J2000 position of star is 11:49:44.8 -12:35:39
Equinox of date position of star is 11:51:06.1 -12:44:30
Star is 58 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 6.9 per integration for unocculted signal
Expected flux drop is 34% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 24.3 km/sec on the sky relative to the star, or, 22.2 arcsec/hr.
Position angle of asteroid motion is 91.8 degrees
The recommended exposure time corresponds to 21.8 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 41.7 km.
The sky-plane scale is 3939.5 km/arcsec.
Diameter estimates:
102.3 km assuming a 5% albedo, maximum of 4.2 sec for a central chord
41.8 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 88.6 km used for deployment plan.
Star training set for 2920_Automedon, (2026/07/15 09:27UT) Object RA Dec mag sep mel Spica 13:26:35.7 -11:17:56 1.0 23.39 77 4Gam Crv 12:17:10.5 -17:41:21 2.6 8.00 66 PPM 225013 11:52:42.8 -12:20:06 6.3 0.57 58 PPM 224961 11:50:25.9 -12:45:46 8.5 0.16 57 2920_Automedon 11:51:06.1 -12:44:30 14.6 58 Positions are for equinox of date
Star training set for 2920_Automedon, (2026/07/15 09:27UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 23.39 77 4Gam Crv 12:15:48.1 -17:32:30 2.6 8.00 66 PPM 225013 11:51:21.5 -12:11:15 6.3 0.57 58 PPM 224961 11:49:04.6 -12:36:55 8.5 0.16 57 2920_Automedon 11:49:44.8 -12:35:39 14.6 58 Positions are for J2000