Occultation event with (11552) Boucolion, event index number 4625
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/09 21:36:38 UTC
J2000 position of star is 06:45:33.2 +11:12:18
Equinox of date position of star is 06:47:02.8 +11:10:30
Star is 130 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.9, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.85 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 27% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 7.1 km/sec on the sky relative to the star, or, 6.9 arcsec/hr.
Position angle of asteroid motion is 74.4 degrees
The recommended exposure time corresponds to 13.2 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 28.8 km.
The sky-plane scale is 3711.5 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 8.1 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 3.3 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/11/09 21:37UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.6 +07:24:35 0.4 12.99 140 Alhena 06:39:15.8 +16:22:26 1.9 5.53 134 31Xi Gem 06:46:47.8 +12:51:52 3.4 1.69 131 PPM 123026 06:48:32.1 +11:01:03 7.7 0.40 130 PPM 122985 06:46:54.0 +11:32:50 8.6 0.37 130 PPM 122986 06:46:56.2 +10:48:19 10.3 0.37 130 11552_Boucolio 06:47:02.8 +11:10:30 15.8 130 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/11/09 21:37UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.99 140 Alhena 06:37:42.8 +16:23:56 1.9 5.53 134 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.69 131 PPM 123026 06:47:02.6 +11:02:54 7.7 0.40 130 PPM 122985 06:45:24.2 +11:34:38 8.6 0.37 130 PPM 122986 06:45:26.9 +10:50:07 10.3 0.37 130 11552_Boucolio 06:45:33.2 +11:12:18 15.8 130 Positions are for J2000