Occultation event with (11552) Boucolion, event index number 1571
Regions able to see the event: SMexico
Geocentric closest approach at 2025/11/23 02:36:17 UTC
J2000 position of star is 04:39:18.1 +05:03:27
Equinox of date position of star is 04:40:40.6 +05:06:24
Star is 149 degrees from the moon. Moon is 7% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 69% with SNR of 6.8 for the occulted depth (per occulted point)
Apparent velocity is 17.4 km/sec on the sky relative to the star, or, 19.5 arcsec/hr.
Position angle of asteroid motion is 82.0 degrees
The recommended exposure time corresponds to 7.0 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 29.3 km.
The sky-plane scale is 3218.4 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum 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, (2025/11/23 02:36UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 11.48 156 Bellatrix 05:26:31.3 +06:22:15 1.6 11.47 156 PPM 147685 04:35:31.0 +05:37:16 5.8 1.38 148 PPM 147753 04:38:59.7 +05:01:59 7.4 0.43 148 PPM 147784 04:40:36.7 +04:47:36 10.3 0.31 148 11552_Boucolio 04:40:40.6 +05:06:24 15.1 149 Positions are for equinox of date
Star training set for 11552_Boucolion, (2025/11/23 02:36UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.48 156 Bellatrix 05:25:07.8 +06:20:58 1.6 11.47 156 PPM 147685 04:34:08.2 +05:34:08 5.8 1.38 148 PPM 147753 04:37:37.3 +04:58:58 7.4 0.43 148 PPM 147784 04:39:14.3 +04:44:38 10.3 0.31 148 11552_Boucolio 04:39:18.1 +05:03:27 15.1 149 Positions are for J2000