Occultation event with (1172) Aneas, event index number 5012
Regions able to see the event: Australia
Geocentric closest approach at 2026/12/03 19:44:19 UTC
J2000 position of star is 05:53:40.0 +17:00:18
Equinox of date position of star is 05:55:13.8 +17:00:32
Star is 104 degrees from the moon. Moon is 24% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=13.5
Use an exposure time of 1.60 seconds with the standard RECON-QHY system.
SNR of 3.7 per integration for unocculted signal
Expected flux drop is 8% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 18.8 arcsec/hr.
Position angle of asteroid motion is 76.0 degrees
The recommended exposure time corresponds to 28.8 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 34.5 km.
The sky-plane scale is 3434.1 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 3.2 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2026/12/03 19:44UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.8 +07:24:35 0.4 9.61 102 Alhena 06:39:16.0 +16:22:26 1.9 10.56 93 57 Ori 05:56:32.3 +19:45:08 5.6 2.76 104 PPM 121583 05:56:32.5 +17:24:17 8.3 0.50 103 PPM 121542 05:55:01.1 +16:58:48 10.7 0.06 104 1172_Aneas 05:55:13.8 +17:00:32 13.5 103 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/12/03 19:44UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.61 102 Alhena 06:37:42.8 +16:23:56 1.9 10.56 93 57 Ori 05:54:56.6 +19:44:58 5.6 2.76 104 PPM 121583 05:54:58.5 +17:24:07 8.3 0.50 103 PPM 121542 05:53:27.3 +16:58:35 10.7 0.06 104 1172_Aneas 05:53:40.0 +17:00:18 13.5 104 Positions are for J2000