Occultation event with (11552) Boucolion, event index number 1456
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/04 14:59:26 UTC
J2000 position of star is 04:47:57.7 +05:32:27
Equinox of date position of star is 04:49:20.3 +05:35:06
Star is 46 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 20% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 14.3 km/sec on the sky relative to the star, or, 15.8 arcsec/hr.
Position angle of asteroid motion is 71.8 degrees
The recommended exposure time corresponds to 23.7 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 26.1 km.
The sky-plane scale is 3266.7 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, aximum of 4.0 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2025/11/04 14:59UT) Object RA Dec mag sep mel Aldebaran 04:37:24.4 +16:33:33 0.8 11.36 42 Bellatrix 05:26:31.1 +06:22:15 1.6 9.28 55 PPM 147967 04:48:40.8 +05:49:57 6.4 0.30 46 PPM 147995 04:49:58.0 +05:38:57 8.9 0.17 46 11552_Boucolio 04:49:20.3 +05:35:06 15.3 47 Positions are for equinox of date
Star training set for 11552_Boucolion, (2025/11/04 14:59UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.36 42 Bellatrix 05:25:07.8 +06:20:58 1.6 9.28 55 PPM 147967 04:47:18.0 +05:47:17 6.4 0.30 46 PPM 147995 04:48:35.3 +05:36:19 8.9 0.17 46 11552_Boucolio 04:47:57.7 +05:32:27 15.3 46 Positions are for J2000