Occultation event with (11552) Boucolion, event index number 3114
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/01/05 23:28:21 UTC
J2000 position of star is 04:18:48.3 +05:20:59
Equinox of date position of star is 04:20:11.3 +05:24:40
Star is 77 degrees from the moon. Moon is 91% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 7.4 per integration for unocculted signal
Expected flux drop is 51% with SNR of 3.8 for the occulted depth (per occulted point)
Apparent velocity is 11.9 km/sec on the sky relative to the star, or, 12.6 arcsec/hr.
Position angle of asteroid motion is 111.9 degrees
The recommended exposure time corresponds to 12.5 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 30.2 km.
The sky-plane scale is 3394.1 km/arcsec.
Diameter estimates:
57.3 km assuming a 5% albedo, maximum of 4.8 sec for a central chord
23.4 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 51.1 km used for deployment plan.
Star training set for 11552_Boucolion, (2026/01/05 23:28UT) Object RA Dec mag sep mel Aldebaran 04:37:25.0 +16:33:34 0.8 11.92 70 67Bet Eri 05:09:07.8 -05:03:17 2.8 16.09 69 45 Tau 04:12:43.5 +05:35:20 5.7 1.87 79 PPM 147386 04:18:34.1 +05:05:13 7.9 0.52 78 PPM 147428 04:20:55.1 +05:33:00 9.3 0.23 77 PPM 147413 04:20:16.1 +05:30:48 10.2 0.10 77 11552_Boucolio 04:20:11.3 +05:24:40 15.5 77 Positions are for equinox of date
Star training set for 11552_Boucolion, (2026/01/05 23:28UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.92 70 67Bet Eri 05:07:50.8 -05:05:13 2.8 16.09 69 45 Tau 04:11:20.5 +05:31:23 5.7 1.87 79 PPM 147386 04:17:11.4 +05:01:28 7.9 0.52 78 PPM 147428 04:19:32.1 +05:29:20 9.3 0.23 77 PPM 147413 04:18:53.1 +05:27:07 10.2 0.10 77 11552_Boucolio 04:18:48.3 +05:20:59 15.5 77 Positions are for J2000