Occultation event with (11552) Boucolion, event index number 4721
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/16 16:05:02 UTC
J2000 position of star is 06:44:03.9 +11:08:07
Equinox of date position of star is 06:45:33.5 +11:06:22
Star is 144 degrees from the moon. Moon is 42% illuminated.
Stellar brightness G=14.8, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 70% with SNR of 6.9 for the occulted depth (per occulted point)
Apparent velocity is 9.7 km/sec on the sky relative to the star, or, 9.6 arcsec/hr.
Position angle of asteroid motion is 82.5 degrees
The recommended exposure time corresponds to 7.3 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 30.5 km.
The sky-plane scale is 3656.1 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 5.9 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/11/16 16:05UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 12.62 131 Alhena 06:39:15.9 +16:22:26 1.9 5.48 143 31Xi Gem 06:46:47.8 +12:51:52 3.4 1.78 144 PPM 122922 06:44:30.7 +10:58:55 8.0 0.29 143 PPM 122936 06:45:03.4 +11:07:22 8.7 0.12 144 11552_Boucolio 06:45:33.5 +11:06:22 15.8 144 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/11/16 16:05UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.62 131 Alhena 06:37:42.8 +16:23:56 1.9 5.48 143 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.78 144 PPM 122922 06:43:01.2 +11:00:37 8.0 0.29 143 PPM 122936 06:43:33.8 +11:09:05 8.7 0.12 144 11552_Boucolio 06:44:03.9 +11:08:07 15.8 144 Positions are for J2000