Occultation event with (11552) Boucolion, event index number 4312
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/26 05:19:13 UTC
J2000 position of star is 06:41:43.1 +12:07:35
Equinox of date position of star is 06:43:12.8 +12:05:56
Star is 103 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 15.0 km/sec on the sky relative to the star, or, 12.9 arcsec/hr.
Position angle of asteroid motion is 106.5 degrees
The recommended exposure time corresponds to 18.0 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 30.2 km.
The sky-plane scale is 4165.8 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 3.8 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/09/26 05:19UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.2 +07:24:35 0.4 12.40 92 Alhena 06:39:15.4 +16:22:27 1.9 4.38 102 31Xi Gem 06:46:47.4 +12:51:52 3.4 1.16 104 PPM 122877 06:42:48.5 +11:41:53 8.2 0.41 103 PPM 122901 06:43:45.7 +11:58:49 8.7 0.18 104 11552_Boucolio 06:43:12.8 +12:05:56 16.1 104 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/09/26 05:19UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.40 92 Alhena 06:37:42.8 +16:23:56 1.9 4.38 102 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.16 104 PPM 122877 06:41:19.0 +11:43:31 8.2 0.41 103 PPM 122901 06:42:16.1 +12:00:29 8.7 0.18 104 11552_Boucolio 06:41:43.1 +12:07:35 16.1 103 Positions are for J2000