Occultation event with (32499) 00YS11, event index number 4471
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/24 06:07:25 UTC
J2000 position of star is 05:15:25.0 +24:08:03
Equinox of date position of star is 05:17:03.2 +24:09:45
Star is 74 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 35% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 9.3 km/sec on the sky relative to the star, or, 9.8 arcsec/hr.
Position angle of asteroid motion is 110.6 degrees
The recommended exposure time corresponds to 12.6 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 32.1 km.
The sky-plane scale is 3431.5 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, maximum of 4.8 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2026/10/24 06:07UT) Object RA Dec mag sep mel Aldebaran 04:37:27.7 +16:33:40 0.8 11.99 65 Alnath 05:27:59.4 +28:37:39 1.6 5.09 77 103 Tau 05:09:44.8 +24:17:53 5.3 1.67 72 PPM 094241 05:19:09.9 +24:02:10 7.9 0.50 75 PPM 094229 05:18:18.8 +24:08:35 9.9 0.29 74 PPM 094210 05:17:06.4 +24:12:12 10.4 0.04 74 32499_00YS11 05:17:03.2 +24:09:45 16.1 74 Positions are for equinox of date
Star training set for 32499_00YS11, (2026/10/24 06:07UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.99 65 Alnath 05:26:17.6 +28:36:22 1.6 5.09 77 103 Tau 05:08:06.6 +24:15:54 5.3 1.67 72 PPM 094241 05:17:31.7 +24:00:33 7.9 0.50 75 PPM 094229 05:16:40.6 +24:06:56 9.9 0.29 74 PPM 094210 05:15:28.1 +24:10:31 10.4 0.04 74 32499_00YS11 05:15:25.0 +24:08:03 16.1 74 Positions are for J2000