Occultation event with (36267) 99XB211, event index number 3488
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/03/23 03:16:31 UTC
J2000 position of star is 10:28:38.0 -02:08:47
Equinox of date position of star is 10:29:58.1 -02:16:52
Star is 103 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 7.5 per integration for unocculted signal
Expected flux drop is 74% with SNR of 5.5 for the occulted depth (per occulted point)
Apparent velocity is 16.5 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
Position angle of asteroid motion is 106.0 degrees
The recommended exposure time corresponds to 9.1 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 15.6 km.
The sky-plane scale is 3415.9 km/arcsec.
Diameter estimates:
42.5 km assuming a 5% albedo, maximum of 2.6 sec for a central chord
17.3 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 39.4 km used for deployment plan.
Star training set for 36267_99XB211, (2026/03/23 03:17UT) Object RA Dec mag sep mel Regulus 10:09:46.0 +11:50:17 1.3 14.99 93 29Del Sex 10:30:48.7 -02:52:26 4.8 0.63 104 PPM 178190 10:29:16.4 -02:50:50 8.5 0.59 104 PPM 178199 10:31:22.1 -02:20:18 8.9 0.35 104 PPM 178194 10:30:07.9 -02:24:36 10.9 0.14 104 36267_99XB211 10:29:58.1 -02:16:52 16.1 104 Positions are for equinox of date
Star training set for 36267_99XB211, (2026/03/23 03:17UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 14.99 93 29Del Sex 10:29:28.7 -02:44:20 4.8 0.63 104 PPM 178190 10:27:56.5 -02:42:46 8.5 0.59 104 PPM 178199 10:30:02.0 -02:12:11 8.9 0.35 104 PPM 178194 10:28:47.8 -02:16:31 10.9 0.14 104 36267_99XB211 10:28:38.0 -02:08:47 16.1 103 Positions are for J2000