Occultation event with (11552) Boucolion, event index number 4743
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/18 01:45:01 UTC
J2000 position of star is 06:43:41.5 +11:07:26
Equinox of date position of star is 06:45:11.1 +11:05:43
Star is 128 degrees from the moon. Moon is 56% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.8
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 6.1 per integration for unocculted signal
Expected flux drop is 49% with SNR of 3.0 for the occulted depth (per occulted point)
Apparent velocity is 10.3 km/sec on the sky relative to the star, or, 10.1 arcsec/hr.
Position angle of asteroid motion is 83.6 degrees
The recommended exposure time corresponds to 12.3 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 30.6 km.
The sky-plane scale is 3645.4 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, (2026/11/18 01:45UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.7 +07:24:35 0.4 12.53 116 Alhena 06:39:15.9 +16:22:26 1.9 5.47 127 31Xi Gem 06:46:47.9 +12:51:52 3.4 1.81 128 PPM 122922 06:44:30.7 +10:58:55 8.0 0.20 128 PPM 122936 06:45:03.4 +11:07:22 8.7 0.04 128 11552_Boucolio 06:45:11.1 +11:05:43 15.8 128 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/11/18 01:45UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 12.53 116 Alhena 06:37:42.8 +16:23:56 1.9 5.47 127 31Xi Gem 06:45:17.2 +12:53:39 3.4 1.81 128 PPM 122922 06:43:01.2 +11:00:37 8.0 0.20 128 PPM 122936 06:43:33.8 +11:09:05 8.7 0.04 128 11552_Boucolio 06:43:41.5 +11:07:26 15.8 128 Positions are for J2000