Occultation event with (11552) Boucolion, event index number 4670
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/13 16:58:12 UTC
J2000 position of star is 06:44:46.9 +11:09:46
Equinox of date position of star is 06:46:16.4 +11:07:59
Star is 165 degrees from the moon. Moon is 17% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.45 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 32% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 8.6 km/sec on the sky relative to the star, or, 8.4 arcsec/hr.
Position angle of asteroid motion is 79.5 degrees
The recommended exposure time corresponds to 12.5 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 29.3 km.
The sky-plane scale is 3679.6 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 6.7 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 2.7 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/11/13 16:58UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.6 +07:24:35 0.4 12.80 157 Alhena 06:39:15.8 +16:22:26 1.9 5.51 170 31Xi Gem 06:46:47.8 +12:51:52 3.4 1.74 166 PPM 122922 06:44:30.6 +10:58:55 8.0 0.46 164 PPM 122936 06:45:03.4 +11:07:22 8.7 0.30 165 11552_Boucolio 06:46:16.4 +11:07:59 15.8 165 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/11/13 16:58UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.80 157 Alhena 06:37:42.8 +16:23:56 1.9 5.51 170 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.74 166 PPM 122922 06:43:01.2 +11:00:37 8.0 0.46 164 PPM 122936 06:43:33.8 +11:09:05 8.7 0.30 165 11552_Boucolio 06:44:46.9 +11:09:46 15.8 165 Positions are for J2000