Occultation event with (36267) 99XB211, event index number 4749
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/11/18 08:18:02 UTC
J2000 position of star is 12:09:55.5 -14:38:43
Equinox of date position of star is 12:11:18.6 -14:47:41
Star is 146 degrees from the moon. Moon is 59% illuminated.
Stellar brightness G=13.5, apparent brightess of occulting body is G=16.8
Use an exposure time of 0.16 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 96% with SNR of 9.3 for the occulted depth (per occulted point)
Apparent velocity is 32.8 km/sec on the sky relative to the star, or, 26.4 arcsec/hr.
Position angle of asteroid motion is 127.1 degrees
The recommended exposure time corresponds to 5.3 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 8.9 km.
The sky-plane scale is 4466.5 km/arcsec.
Diameter estimates:
42.5 km assuming a 5% albedo, maximum of 1.3 sec for a central chord
17.3 km assuming a 30% albedo, maximum of 0.5 sec for a central chord
Cross-track diameter of 39.4 km used for deployment plan.
Star training set for 36267_99XB211, (2026/11/18 08:18UT) Object RA Dec mag sep mel Spica 13:26:36.8 -11:18:03 1.0 18.66 132 4Gam Crv 12:17:11.6 -17:41:28 2.6 3.22 143 PPM 225621 12:18:26.8 -16:50:35 6.3 2.67 143 PPM 225384 12:08:59.3 -15:00:33 8.5 0.60 146 PPM 225437 12:10:55.6 -14:55:05 9.5 0.15 146 36267_99XB211 12:11:18.6 -14:47:41 16.8 145 Positions are for equinox of date
Star training set for 36267_99XB211, (2026/11/18 08:18UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 18.66 132 4Gam Crv 12:15:48.1 -17:32:30 2.6 3.22 143 PPM 225621 12:17:03.3 -16:41:38 6.3 2.67 143 PPM 225384 12:07:36.3 -14:51:35 8.5 0.60 146 PPM 225437 12:09:32.5 -14:46:07 9.5 0.15 146 36267_99XB211 12:09:55.5 -14:38:43 16.8 146 Positions are for J2000