Occultation event with (2207) Antenor, event index number 1691
Regions able to see the event: SMexico
Geocentric closest approach at 2025/12/17 08:47:46 UTC
J2000 position of star is 03:08:12.3 +09:29:36
Equinox of date position of star is 03:09:36.4 +09:35:30
Star is 165 degrees from the moon. Moon is 7% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 4.8 per integration for unocculted signal
Expected flux drop is 12% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 10.8 km/sec on the sky relative to the star, or, 12.5 arcsec/hr.
Position angle of asteroid motion is 84.4 degrees
The recommended exposure time corresponds to 21.7 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 37.8 km.
The sky-plane scale is 3131.0 km/arcsec.
Diameter estimates:
98.6 km assuming a 5% albedo, aximum of 9.1 sec for a central chord
40.3 km assuming a 30% albedo, maximum of 3.7 sec for a central chord
Cross-track diameter of 97.7 km used for deployment plan.
Star training set for 2207_Antenor, (2025/12/17 08:48UT) Object RA Dec mag sep mel Aldebaran 04:37:24.8 +16:33:34 0.8 22.47 163 Menkar 03:03:38.4 +04:11:24 2.5 5.60 159 91Lam Cet 03:01:06.6 +09:00:33 4.7 2.18 163 PPM 146265 03:09:14.3 +10:01:17 7.8 0.44 165 PPM 146274 03:09:41.6 +09:24:33 10.0 0.18 164 2207_Antenor 03:09:36.4 +09:35:30 14.0 165 Positions are for equinox of date
Star training set for 2207_Antenor, (2025/12/17 08:48UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 22.47 163 Menkar 03:02:16.8 +04:05:21 2.5 5.60 159 91Lam Cet 02:59:42.9 +08:54:26 4.7 2.18 163 PPM 146265 03:07:50.0 +09:55:23 7.8 0.44 165 PPM 146274 03:08:17.5 +09:18:40 10.0 0.18 164 2207_Antenor 03:08:12.3 +09:29:36 14.0 165 Positions are for J2000