Occultation event with (1172) Aneas, event index number 4868
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/11/25 02:22:57 UTC
J2000 position of star is 05:57:52.5 +17:16:41
Equinox of date position of star is 05:59:26.4 +17:16:44
Star is 23 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=13.6
Use an exposure time of 1.80 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 20% with SNR of 1.9 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 16.9 arcsec/hr.
Position angle of asteroid motion is 73.4 degrees
The recommended exposure time corresponds to 29.2 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 34.6 km.
The sky-plane scale is 3468.7 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, maximum of 8.5 sec for a central chord
56.6 km assuming a 30% albedo, maximum of 3.5 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2026/11/25 02:23UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 9.89 28 Alhena 06:39:15.9 +16:22:26 1.9 9.57 32 57 Ori 05:56:32.2 +19:45:08 5.6 2.57 21 PPM 121709 06:00:58.8 +17:48:49 8.2 0.65 23 PPM 121657 05:59:08.3 +17:22:57 10.0 0.13 23 1172_Aneas 05:59:26.4 +17:16:44 13.6 23 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/11/25 02:23UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.89 28 Alhena 06:37:42.8 +16:23:56 1.9 9.57 32 57 Ori 05:54:56.6 +19:44:58 5.6 2.57 21 PPM 121709 05:59:24.5 +17:48:50 8.2 0.65 23 PPM 121657 05:57:34.3 +17:22:53 10.0 0.13 23 1172_Aneas 05:57:52.5 +17:16:41 13.6 23 Positions are for J2000