Occultation event with (1172) Aneas, event index number 3462
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/03/18 23:42:37 UTC
J2000 position of star is 03:46:06.2 +19:44:40
Equinox of date position of star is 03:47:37.4 +19:49:28
Star is 61 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=13.7, apparent brightess of occulting body is G=14.2
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 60% with SNR of 6.0 for the occulted depth (per occulted point)
Apparent velocity is 26.2 km/sec on the sky relative to the star, or, 21.8 arcsec/hr.
Position angle of asteroid motion is 84.9 degrees
The recommended exposure time corresponds to 6.6 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 33.1 km.
The sky-plane scale is 4321.9 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, maximum of 5.3 sec for a central chord
56.6 km assuming a 30% albedo, maximum of 2.2 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2026/03/18 23:43UT) Object RA Dec mag sep mel Aldebaran 04:37:25.7 +16:33:35 0.8 12.27 73 44Zet Per 03:55:47.2 +31:57:33 2.8 12.27 66 13 Tau 03:43:49.9 +19:46:56 5.7 0.89 60 PPM 092759 03:44:01.1 +20:13:53 8.5 0.94 61 PPM 119328 03:46:24.2 +19:54:40 8.7 0.30 61 1172_Aneas 03:47:37.4 +19:49:28 14.2 62 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/03/18 23:43UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 12.27 73 44Zet Per 03:54:07.9 +31:53:01 2.8 12.27 66 13 Tau 03:42:18.9 +19:42:01 5.7 0.89 60 PPM 092759 03:42:29.9 +20:08:58 8.5 0.94 61 PPM 119328 03:44:53.1 +19:49:50 8.7 0.30 61 1172_Aneas 03:46:06.2 +19:44:40 14.2 61 Positions are for J2000