Occultation event with (11552) Boucolion, event index number 5046
Regions able to see the event: SMexico
Geocentric closest approach at 2026/12/05 10:25:09 UTC
J2000 position of star is 06:37:26.9 +11:05:46
Equinox of date position of star is 06:38:56.7 +11:04:17
Star is 112 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 7.2 per integration for unocculted signal
Expected flux drop is 57% with SNR of 4.1 for the occulted depth (per occulted point)
Apparent velocity is 15.8 km/sec on the sky relative to the star, or, 16.1 arcsec/hr.
Position angle of asteroid motion is 92.5 degrees
The recommended exposure time corresponds to 12.6 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 31.6 km.
The sky-plane scale is 3540.1 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/12/05 10:25UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.8 +07:24:35 0.4 11.06 121 Alhena 06:39:16.0 +16:22:26 1.9 5.30 113 PPM 122614 06:33:18.4 +11:31:23 5.4 1.45 113 PPM 122765 06:38:52.8 +11:05:56 7.8 0.03 112 11552_Boucolio 06:38:56.7 +11:04:17 15.6 112 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/12/05 10:25UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 11.06 121 Alhena 06:37:42.8 +16:23:56 1.9 5.30 113 PPM 122614 06:31:48.3 +11:32:40 5.4 1.45 113 PPM 122765 06:37:23.0 +11:07:25 7.8 0.03 112 11552_Boucolio 06:37:26.9 +11:05:46 15.6 112 Positions are for J2000