Occultation event with (1173) Anchises, event index number 1733
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/30 01:51:09 UTC
J2000 position of star is 01:12:13.4 +15:12:55
Equinox of date position of star is 01:13:36.3 +15:21:10
Star is 16 degrees from the moon. Moon is 75% illuminated.
Stellar brightness G=11.9, apparent brightess of occulting body is G=14.2
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 22.6 per integration for unocculted signal
Expected flux drop is 90% with SNR of 20.3 for the occulted depth (per occulted point)
Apparent velocity is 7.5 km/sec on the sky relative to the star, or, 8.1 arcsec/hr.
Position angle of asteroid motion is 98.2 degrees
The recommended exposure time corresponds to 0.9 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 33.4 km.
The sky-plane scale is 3326.4 km/arcsec.
Diameter estimates:
97.7 km assuming a 5% albedo, aximum of 13.0 sec for a central chord
39.9 km assuming a 30% albedo, maximum of 5.3 sec for a central chord
Cross-track diameter of 99.5 km used for deployment plan.
Star training set for 1173_Anchises, (2025/12/30 01:51UT) Object RA Dec mag sep mel Aldebaran 04:37:24.9 +16:33:34 0.8 48.87 33 6Bet Ari 01:56:04.9 +20:56:02 2.6 11.53 6 87 Psc 01:15:30.7 +16:16:13 5.7 1.03 15 PPM 117067 01:09:14.3 +16:00:04 8.5 1.23 17 PPM 117133 01:13:38.8 +15:23:40 9.9 0.04 16 1173_Anchises 01:13:36.3 +15:21:10 14.2 16 Positions are for equinox of date
Star training set for 1173_Anchises, (2025/12/30 01:51UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 48.87 33 6Bet Ari 01:54:38.6 +20:48:26 2.6 11.53 6 87 Psc 01:14:07.5 +16:07:59 5.7 1.03 15 PPM 117067 01:07:51.4 +15:51:46 8.5 1.23 17 PPM 117133 01:12:15.9 +15:15:26 9.9 0.04 16 1173_Anchises 01:12:13.4 +15:12:55 14.2 16 Positions are for J2000