Occultation event with (1172) Aneas, event index number 3956
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/08 08:42:59 UTC
J2000 position of star is 05:40:52.2 +20:35:39
Equinox of date position of star is 05:42:27.3 +20:36:22
Star is 12 degrees from the moon. Moon is 25% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.3
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 16% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 30.4 km/sec on the sky relative to the star, or, 24.2 arcsec/hr.
Position angle of asteroid motion is 96.5 degrees
The recommended exposure time corresponds to 28.9 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 32.5 km.
The sky-plane scale is 4511.4 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, maximum of 4.6 sec for a central chord
56.6 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2026/08/08 08:43UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.8 +07:24:35 0.4 13.63 25 Alnath 05:27:58.6 +28:37:38 1.6 8.67 7 123Zet Tau 05:39:14.2 +21:09:23 3.0 0.93 11 PPM 094568 05:38:37.5 +20:44:31 8.5 0.91 12 PPM 094691 05:43:30.4 +20:30:41 8.9 0.26 13 1172_Aneas 05:42:27.3 +20:36:22 14.3 13 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/08/08 08:43UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 13.63 25 Alnath 05:26:17.6 +28:36:22 1.6 8.67 7 123Zet Tau 05:37:38.7 +21:08:33 3.0 0.93 11 PPM 094568 05:37:02.3 +20:43:39 8.5 0.91 12 PPM 094691 05:41:55.3 +20:30:01 8.9 0.26 13 1172_Aneas 05:40:52.2 +20:35:39 14.3 12 Positions are for J2000