Occultation event with (36267) 99XB211, event index number 5087
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/07 04:18:39 UTC
J2000 position of star is 12:19:45.0 -16:36:53
Equinox of date position of star is 12:21:08.8 -16:45:50
Star is 43 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=16.8
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 5.6 per integration for unocculted signal
Expected flux drop is 84% with SNR of 4.7 for the occulted depth (per occulted point)
Apparent velocity is 26.6 km/sec on the sky relative to the star, or, 22.4 arcsec/hr.
Position angle of asteroid motion is 133.1 degrees
The recommended exposure time corresponds to 9.3 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 6.2 km.
The sky-plane scale is 4282.5 km/arcsec.
Diameter estimates:
42.5 km assuming a 5% albedo, maximum of 1.6 sec for a central chord
17.3 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 39.4 km used for deployment plan.
Star training set for 36267_99XB211, (2026/12/07 04:19UT) Object RA Dec mag sep mel Spica 13:26:37.0 -11:18:04 1.0 16.78 31 4Gam Crv 12:17:11.7 -17:41:29 2.6 1.32 44 PPM 225621 12:18:26.9 -16:50:36 6.3 0.65 44 PPM 225665 12:20:42.5 -16:25:23 7.4 0.36 44 PPM 225658 12:20:08.7 -16:58:32 8.8 0.32 44 PPM 225667 12:20:45.4 -16:49:23 10.1 0.11 44 36267_99XB211 12:21:08.8 -16:45:50 16.8 43 Positions are for equinox of date
Star training set for 36267_99XB211, (2026/12/07 04:19UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 16.78 31 4Gam Crv 12:15:48.1 -17:32:30 2.6 1.32 44 PPM 225621 12:17:03.3 -16:41:38 6.3 0.65 44 PPM 225665 12:19:18.7 -16:16:25 7.4 0.36 44 PPM 225658 12:18:45.0 -16:49:34 8.8 0.32 44 PPM 225667 12:19:21.6 -16:40:25 10.1 0.11 44 36267_99XB211 12:19:45.0 -16:36:53 16.8 43 Positions are for J2000