Occultation event with (36267) 99XB211, event index number 3417
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/03/13 06:50:58 UTC
J2000 position of star is 10:33:20.7 -02:27:24
Equinox of date position of star is 10:34:40.7 -02:35:32
Star is 121 degrees from the moon. Moon is 32% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.9 per integration for unocculted signal
Expected flux drop is 57% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 18.3 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 103.6 degrees
The recommended exposure time corresponds to 9.1 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 16.9 km.
The sky-plane scale is 3385.8 km/arcsec.
Diameter estimates:
42.5 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
17.3 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 39.4 km used for deployment plan.
Star training set for 36267_99XB211, (2026/03/13 06:51UT) Object RA Dec mag sep mel Regulus 10:09:45.9 +11:50:17 1.3 15.70 133 29Del Sex 10:30:48.6 -02:52:26 4.8 1.01 121 PPM 178213 10:33:27.0 -02:47:35 8.5 0.37 121 PPM 178217 10:34:39.9 -02:38:35 9.5 0.05 121 36267_99XB211 10:34:40.7 -02:35:32 15.9 120 Positions are for equinox of date
Star training set for 36267_99XB211, (2026/03/13 06:51UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.70 133 29Del Sex 10:29:28.7 -02:44:20 4.8 1.01 121 PPM 178213 10:32:07.1 -02:39:28 8.5 0.37 121 PPM 178217 10:33:19.9 -02:30:27 9.5 0.05 121 36267_99XB211 10:33:20.7 -02:27:24 15.9 121 Positions are for J2000