Occultation event with (1172) Aneas, event index number 4421
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/17 04:04:56 UTC
J2000 position of star is 06:07:24.6 +18:36:30
Equinox of date position of star is 06:08:59.0 +18:36:11
Star is 170 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=14.0
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 29% with SNR of 2.8 for the occulted depth (per occulted point)
Apparent velocity is 5.5 km/sec on the sky relative to the star, or, 5.2 arcsec/hr.
Position angle of asteroid motion is 3.1 degrees
The recommended exposure time corresponds to 6.8 km per image.
The 1-sigma error in the time of the event is 5.8 seconds.
The 1-sigma cross-track error in the shadow position is 11.2 km.
The sky-plane scale is 3781.8 km/arcsec.
Diameter estimates:
138.7 km assuming a 5% albedo, maximum of 25.3 sec for a central chord
56.6 km assuming a 30% albedo, maximum of 10.3 sec for a central chord
Cross-track diameter of 118.0 km used for deployment plan.
Star training set for 1172_Aneas, (2026/10/17 04:05UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.4 +07:24:35 0.4 11.59 158 Alhena 06:39:15.6 +16:22:27 1.9 7.55 169 64 Ori 06:05:02.5 +19:41:16 4.9 1.43 170 PPM 121950 06:09:36.4 +18:39:49 8.5 0.16 170 PPM 121922 06:08:32.7 +18:35:45 9.4 0.10 169 1172_Aneas 06:08:59.0 +18:36:11 14.0 170 Positions are for equinox of date
Star training set for 1172_Aneas, (2026/10/17 04:05UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 11.59 158 Alhena 06:37:42.8 +16:23:56 1.9 7.55 169 64 Ori 06:03:27.3 +19:41:26 4.9 1.43 170 PPM 121950 06:08:01.9 +18:40:10 8.5 0.16 170 PPM 121922 06:06:58.2 +18:36:03 9.4 0.10 169 1172_Aneas 06:07:24.6 +18:36:30 14.0 170 Positions are for J2000