Occultation event with (32499) 00YS11, event index number 4078
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/22 18:49:18 UTC
J2000 position of star is 05:06:22.1 +22:27:35
Equinox of date position of star is 05:07:58.4 +22:29:37
Star is 168 degrees from the moon. Moon is 74% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 7.9 per integration for unocculted signal
Expected flux drop is 83% with SNR of 6.6 for the occulted depth (per occulted point)
Apparent velocity is 20.6 km/sec on the sky relative to the star, or, 18.2 arcsec/hr.
Position angle of asteroid motion is 75.1 degrees
The recommended exposure time corresponds to 9.2 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 25.6 km.
The sky-plane scale is 4056.4 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, maximum of 2.2 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2026/08/22 18:49UT) Object RA Dec mag sep mel Aldebaran 04:37:27.2 +16:33:38 0.8 9.32 158 Alnath 05:27:58.7 +28:37:39 1.6 7.61 174 PPM 094053 05:07:14.4 +23:05:44 6.5 0.63 168 PPM 094066 05:08:17.2 +22:32:39 7.0 0.09 168 32499_00YS11 05:07:58.4 +22:29:37 16.5 168 Positions are for equinox of date
Star training set for 32499_00YS11, (2026/08/22 18:49UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 9.32 158 Alnath 05:26:17.6 +28:36:22 1.6 7.61 174 PPM 094053 05:05:37.7 +23:03:40 6.5 0.63 168 PPM 094066 05:06:40.9 +22:30:38 7.0 0.09 168 32499_00YS11 05:06:22.1 +22:27:35 16.5 168 Positions are for J2000