Occultation event with (11552) Boucolion, event index number 1471
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/08 02:55:40 UTC
J2000 position of star is 04:46:30.1 +05:25:45
Equinox of date position of star is 04:47:52.8 +05:28:27
Star is 25 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 6.3 per integration for unocculted signal
Expected flux drop is 47% with SNR of 2.9 for the occulted depth (per occulted point)
Apparent velocity is 15.1 km/sec on the sky relative to the star, or, 16.8 arcsec/hr.
Position angle of asteroid motion is 74.0 degrees
The recommended exposure time corresponds to 12.1 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 26.3 km.
The sky-plane scale is 3252.3 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, aximum of 3.8 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, (2025/11/08 02:56UT) Object RA Dec mag sep mel Aldebaran 04:37:24.4 +16:33:33 0.8 11.38 16 Bellatrix 05:26:31.1 +06:22:15 1.6 9.65 22 PPM 147967 04:48:40.8 +05:49:57 6.4 0.41 24 PPM 147961 04:48:17.7 +05:16:36 9.2 0.22 25 PPM 147940 04:47:37.9 +05:30:12 10.9 0.07 25 11552_Boucolio 04:47:52.8 +05:28:27 15.3 24 Positions are for equinox of date
Star training set for 11552_Boucolion, (2025/11/08 02:56UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.38 16 Bellatrix 05:25:07.8 +06:20:58 1.6 9.65 22 PPM 147967 04:47:18.0 +05:47:17 6.4 0.41 24 PPM 147961 04:46:55.2 +05:13:55 9.2 0.22 25 PPM 147940 04:46:15.2 +05:27:30 10.9 0.07 25 11552_Boucolio 04:46:30.1 +05:25:45 15.3 25 Positions are for J2000