Occultation event with (11552) Boucolion, event index number 1565
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/21 23:27:38 UTC
J2000 position of star is 04:39:53.0 +05:04:43
Equinox of date position of star is 04:41:15.5 +05:07:39
Star is 156 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 6.0 per integration for unocculted signal
Expected flux drop is 45% with SNR of 2.7 for the occulted depth (per occulted point)
Apparent velocity is 17.3 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 81.5 degrees
The recommended exposure time corresponds to 12.1 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 29.1 km.
The sky-plane scale is 3219.3 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, (2025/11/21 23:28UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 11.47 167 Bellatrix 05:26:31.3 +06:22:15 1.6 11.33 158 PPM 147685 04:35:31.0 +05:37:16 5.8 1.51 156 PPM 147753 04:38:59.7 +05:01:59 7.4 0.57 156 PPM 147813 04:42:23.3 +05:15:58 10.0 0.31 156 11552_Boucolio 04:41:15.5 +05:07:39 15.1 156 Positions are for equinox of date
Star training set for 11552_Boucolion, (2025/11/21 23:28UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.47 167 Bellatrix 05:25:07.8 +06:20:58 1.6 11.33 158 PPM 147685 04:34:08.2 +05:34:08 5.8 1.51 156 PPM 147753 04:37:37.3 +04:58:58 7.4 0.57 156 PPM 147813 04:41:00.7 +05:13:04 10.0 0.31 156 11552_Boucolio 04:39:53.0 +05:04:43 15.1 156 Positions are for J2000