Occultation event with (1172) Aneas, event index number 5030
Regions able to see the event: Australia
Geocentric closest approach at 2026/12/04 16:53:09 UTC
J2000 position of star is 05:53:12.9 +16:58:43
Equinox of date position of star is 05:54:46.7 +16:58:57
Star is 115 degrees from the moon. Moon is 17% illuminated.
Stellar brightness G=13.4, apparent brightess of occulting body is G=13.4
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 50% with SNR of 4.9 for the occulted depth (per occulted point)
Apparent velocity is 18.1 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 76.3 degrees
The recommended exposure time corresponds to 3.6 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 33.8 km.
The sky-plane scale is 3431.5 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, maximum of 7.7 sec for a central chord
56.6 km assuming a 30% albedo, maximum of 3.1 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2026/12/04 16:53UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.8 +07:24:35 0.4 9.58 113 Alhena 06:39:16.0 +16:22:26 1.9 10.67 104 57 Ori 05:56:32.3 +19:45:08 5.6 2.80 115 PPM 121583 05:56:32.5 +17:24:17 8.3 0.60 114 PPM 121489 05:52:51.0 +17:20:25 9.8 0.58 115 PPM 121542 05:55:01.1 +16:58:48 10.7 0.06 115 1172_Aneas 05:54:46.7 +16:58:57 13.4 114 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/12/04 16:53UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.58 113 Alhena 06:37:42.8 +16:23:56 1.9 10.67 104 57 Ori 05:54:56.6 +19:44:58 5.6 2.80 115 PPM 121583 05:54:58.5 +17:24:07 8.3 0.60 114 PPM 121489 05:51:16.9 +17:20:06 9.8 0.58 115 PPM 121542 05:53:27.3 +16:58:35 10.7 0.06 115 1172_Aneas 05:53:12.9 +16:58:43 13.4 115 Positions are for J2000