Occultation event with (1173) Anchises, event index number 1285
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/09/15 09:15:44 UTC
J2000 position of star is 01:44:03.4 +19:35:16
Equinox of date position of star is 01:45:27.8 +19:42:58
Star is 63 degrees from the moon. Moon is 40% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=13.7
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 35% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 9.9 km/sec on the sky relative to the star, or, 12.2 arcsec/hr.
Position angle of asteroid motion is 80.6 degrees
The recommended exposure time corresponds to 6.4 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 30.6 km.
The sky-plane scale is 2902.5 km/arcsec.
Diameter estimates:
97.7 km assuming a 5% albedo, aximum of 9.9 sec for a central chord
39.9 km assuming a 30% albedo, maximum of 4.0 sec for a central chord
Cross-track diameter of 99.5 km used for deployment plan.
Star training set for 1173_Anchises, (2025/09/15 09:16UT) Object RA Dec mag sep mel Aldebaran 04:37:23.9 +16:33:32 0.8 40.87 27 6Bet Ari 01:56:03.9 +20:55:57 2.6 2.77 61 107 Psc 01:43:53.8 +20:23:33 6.0 0.77 64 109 Psc 01:46:20.4 +20:12:38 7.1 0.54 63 PPM 117632 01:45:53.4 +19:33:41 9.4 0.18 63 1173_Anchises 01:45:27.8 +19:42:58 13.7 63 Positions are for equinox of date
Star training set for 1173_Anchises, (2025/09/15 09:16UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 40.87 27 6Bet Ari 01:54:38.6 +20:48:26 2.6 2.77 61 107 Psc 01:42:29.2 +20:15:49 6.0 0.77 64 109 Psc 01:44:55.7 +20:04:56 7.1 0.54 63 PPM 117632 01:44:29.0 +19:25:59 9.4 0.18 63 1173_Anchises 01:44:03.4 +19:35:16 13.7 63 Positions are for J2000