Occultation event with (11552) Boucolion, event index number 4355
Regions able to see the event: Australia
Geocentric closest approach at 2026/10/06 16:45:47 UTC
J2000 position of star is 06:44:41.3 +11:52:16
Equinox of date position of star is 06:46:11.0 +11:50:30
Star is 44 degrees from the moon. Moon is 17% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 44% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 10.2 km/sec on the sky relative to the star, or, 9.1 arcsec/hr.
Position angle of asteroid motion is 113.4 degrees
The recommended exposure time corresponds to 12.8 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 29.8 km.
The sky-plane scale is 4053.7 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 5.6 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/10/06 16:46UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.3 +07:24:35 0.4 12.99 57 Alhena 06:39:15.5 +16:22:27 1.9 4.83 46 31Xi Gem 06:46:47.5 +12:51:52 3.4 1.03 44 PPM 122956 06:45:57.8 +11:49:53 8.1 0.05 44 11552_Boucolio 06:46:11.0 +11:50:30 16.1 44 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/10/06 16:46UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.99 57 Alhena 06:37:42.8 +16:23:56 1.9 4.83 46 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.03 44 PPM 122956 06:44:28.2 +11:51:38 8.1 0.05 44 11552_Boucolio 06:44:41.3 +11:52:16 16.1 44 Positions are for J2000