Occultation event with (11552) Boucolion, event index number 1583
Regions able to see the event: SAmericaS
Geocentric closest approach at 2025/11/25 05:38:12 UTC
J2000 position of star is 04:38:11.8 +05:01:19
Equinox of date position of star is 04:39:34.3 +05:04:19
Star is 127 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 22% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 17.6 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 83.1 degrees
The recommended exposure time corresponds to 20.2 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 29.2 km.
The sky-plane scale is 3217.5 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, aximum of 3.3 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2025/11/25 05:38UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 11.50 131 Bellatrix 05:26:31.3 +06:22:15 1.6 11.75 138 PPM 147685 04:35:31.0 +05:37:16 5.8 1.15 127 PPM 147753 04:38:59.7 +05:01:59 7.4 0.15 127 11552_Boucolio 04:39:34.3 +05:04:19 15.1 128 Positions are for equinox of date
Star training set for 11552_Boucolion, (2025/11/25 05:38UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.50 131 Bellatrix 05:25:07.8 +06:20:58 1.6 11.75 138 PPM 147685 04:34:08.2 +05:34:08 5.8 1.15 127 PPM 147753 04:37:37.3 +04:58:58 7.4 0.15 127 11552_Boucolio 04:38:11.8 +05:01:19 15.1 127 Positions are for J2000