Occultation event with (11552) Boucolion, event index number 1523
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/17 00:34:19 UTC
J2000 position of star is 04:42:22.5 +05:11:07
Equinox of date position of star is 04:43:45.1 +05:13:58
Star is 127 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=15.2
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 7.0 per integration for unocculted signal
Expected flux drop is 49% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 16.8 km/sec on the sky relative to the star, or, 18.7 arcsec/hr.
Position angle of asteroid motion is 79.0 degrees
The recommended exposure time corresponds to 12.6 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 28.6 km.
The sky-plane scale is 3226.5 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, aximum of 3.4 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2025/11/17 00:34UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 11.43 129 Bellatrix 05:26:31.2 +06:22:15 1.6 10.70 116 PPM 147967 04:48:40.9 +05:49:58 6.4 1.37 125 PPM 147869 04:44:49.7 +05:00:36 8.4 0.35 126 PPM 147865 04:44:45.8 +05:18:13 9.9 0.26 126 PPM 147840 04:44:01.3 +05:21:11 11.1 0.14 127 11552_Boucolio 04:43:45.1 +05:13:58 15.2 126 Positions are for equinox of date
Star training set for 11552_Boucolion, (2025/11/17 00:34UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.43 129 Bellatrix 05:25:07.8 +06:20:58 1.6 10.70 116 PPM 147967 04:47:18.0 +05:47:17 6.4 1.37 125 PPM 147869 04:43:27.3 +04:57:47 8.4 0.35 126 PPM 147865 04:43:23.2 +05:15:24 9.9 0.26 126 PPM 147840 04:42:38.7 +05:18:21 11.1 0.14 127 11552_Boucolio 04:42:22.5 +05:11:07 15.2 127 Positions are for J2000