Occultation event with (11552) Boucolion, event index number 4810
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/22 04:01:53 UTC
J2000 position of star is 06:42:28.9 +11:05:56
Equinox of date position of star is 06:43:58.6 +11:04:15
Star is 76 degrees from the moon. Moon is 92% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.7
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 5.2 per integration for unocculted signal
Expected flux drop is 46% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 11.7 km/sec on the sky relative to the star, or, 11.7 arcsec/hr.
Position angle of asteroid motion is 86.5 degrees
The recommended exposure time corresponds to 12.3 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 30.7 km.
The sky-plane scale is 3615.9 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 4.9 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/11/22 04:02UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 12.24 65 Alhena 06:39:15.9 +16:22:26 1.9 5.43 73 31Xi Gem 06:46:47.9 +12:51:52 3.4 1.92 76 PPM 122922 06:44:30.7 +10:58:55 8.0 0.16 76 11552_Boucolio 06:43:58.6 +11:04:15 15.7 76 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/11/22 04:02UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.24 65 Alhena 06:37:42.8 +16:23:56 1.9 5.43 73 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.92 76 PPM 122922 06:43:01.2 +11:00:37 8.0 0.16 76 11552_Boucolio 06:42:28.9 +11:05:56 15.7 76 Positions are for J2000