Occultation event with (11552) Boucolion, event index number 3567
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/04/01 22:54:23 UTC
J2000 position of star is 04:34:30.4 +10:00:57
Equinox of date position of star is 04:35:56.9 +10:04:08
Star is 121 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=7.6, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 100.6 per integration for unocculted signal
Expected flux drop is 100% with SNR of 100.6 for the occulted depth (per occulted point)
Apparent velocity is 29.0 km/sec on the sky relative to the star, or, 24.0 arcsec/hr.
Position angle of asteroid motion is 69.0 degrees
The recommended exposure time corresponds to 3.5 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 24.6 km.
The sky-plane scale is 4350.0 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/04/01 22:54UT) Object RA Dec mag sep mel Aldebaran 04:37:25.8 +16:33:36 0.8 6.50 120 Bellatrix 05:26:32.4 +06:22:17 1.6 13.05 108 88 Tau 04:37:05.9 +10:12:46 4.5 0.32 120 PPM 120034 04:35:56.9 +10:04:08 8.4 0.00 121 11552_Boucolio 04:35:56.9 +10:04:08 16.1 120 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/04/01 22:54UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 6.50 120 Bellatrix 05:25:07.8 +06:20:58 1.6 13.05 108 88 Tau 04:35:39.3 +10:09:39 4.5 0.32 120 PPM 120034 04:34:30.4 +10:00:58 8.4 0.00 121 11552_Boucolio 04:34:30.4 +10:00:57 16.1 121 Positions are for J2000