Occultation event with (32499) 00YS11, event index number 4246
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/09/16 01:24:19 UTC
J2000 position of star is 05:15:41.2 +23:09:57
Equinox of date position of star is 05:17:18.3 +23:11:38
Star is 152 degrees from the moon. Moon is 24% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 75% with SNR of 7.0 for the occulted depth (per occulted point)
Apparent velocity is 10.0 km/sec on the sky relative to the star, or, 9.4 arcsec/hr.
Position angle of asteroid motion is 64.2 degrees
The recommended exposure time corresponds to 9.5 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 21.4 km.
The sky-plane scale is 3802.0 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, maximum of 4.5 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2026/09/16 01:24UT) Object RA Dec mag sep mel Aldebaran 04:37:27.4 +16:33:39 0.8 11.47 159 Alnath 05:27:59.0 +28:37:39 1.6 5.94 150 108 Tau 05:17:04.1 +22:18:47 6.2 0.88 152 PPM 094242 05:19:09.3 +22:51:22 9.6 0.54 152 PPM 094215 05:17:30.9 +23:12:18 11.2 0.05 152 32499_00YS11 05:17:18.3 +23:11:38 16.4 152 Positions are for equinox of date
Star training set for 32499_00YS11, (2026/09/16 01:24UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.47 159 Alnath 05:26:17.6 +28:36:22 1.6 5.94 150 108 Tau 05:15:27.6 +22:17:05 6.2 0.88 152 PPM 094242 05:17:32.4 +22:49:45 9.6 0.54 152 PPM 094215 05:15:53.8 +23:10:37 11.2 0.05 152 32499_00YS11 05:15:41.2 +23:09:57 16.4 152 Positions are for J2000