Occultation event with (1172) Aneas, event index number 5054
Regions able to see the event: Australia
Geocentric closest approach at 2026/12/05 18:28:38 UTC
J2000 position of star is 05:52:39.8 +16:56:48
Equinox of date position of star is 05:54:13.6 +16:57:03
Star is 128 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=13.4
Use an exposure time of 1.90 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 6% with SNR of 0.2 for the occulted depth (per occulted point)
Apparent velocity is 18.3 km/sec on the sky relative to the star, or, 19.2 arcsec/hr.
Position angle of asteroid motion is 76.5 degrees
The recommended exposure time corresponds to 34.7 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 3428.6 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, maximum of 7.6 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, (2026/12/05 18:29UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.8 +07:24:35 0.4 9.56 125 Alhena 06:39:16.0 +16:22:26 1.9 10.80 117 126 Tau 05:42:51.1 +16:32:44 4.6 2.75 130 PPM 121567 05:55:45.6 +16:20:50 8.3 0.71 127 PPM 121489 05:52:51.0 +17:20:25 9.8 0.51 128 PPM 121542 05:55:01.1 +16:58:48 10.7 0.19 128 1172_Aneas 05:54:13.6 +16:57:03 13.4 127 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/12/05 18:29UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 9.56 125 Alhena 06:37:42.8 +16:23:56 1.9 10.80 117 126 Tau 05:41:17.7 +16:32:01 4.6 2.75 130 PPM 121567 05:54:12.2 +16:20:38 8.3 0.71 127 PPM 121489 05:51:16.9 +17:20:06 9.8 0.51 128 PPM 121542 05:53:27.3 +16:58:35 10.7 0.19 128 1172_Aneas 05:52:39.8 +16:56:48 13.4 128 Positions are for J2000