Occultation event with (32499) 00YS11, event index number 3911
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/07/30 10:17:57 UTC
J2000 position of star is 04:52:12.8 +21:39:52
Equinox of date position of star is 04:53:48.1 +21:42:25
Star is 118 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 61% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 29.4 km/sec on the sky relative to the star, or, 24.7 arcsec/hr.
Position angle of asteroid motion is 76.9 degrees
The recommended exposure time corresponds to 16.1 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 26.4 km.
The sky-plane scale is 4271.8 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, maximum of 1.5 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2026/07/30 10:18UT) Object RA Dec mag sep mel Aldebaran 04:37:26.9 +16:33:38 0.8 6.43 113 Alnath 05:27:58.5 +28:37:38 1.6 10.37 126 PPM 093742 04:47:19.0 +23:40:29 6.1 2.47 116 PPM 093881 04:56:25.0 +22:11:14 8.5 0.77 118 PPM 093852 04:54:41.6 +21:55:55 9.9 0.31 118 32499_00YS11 04:53:48.1 +21:42:25 16.5 118 Positions are for equinox of date
Star training set for 32499_00YS11, (2026/07/30 10:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 6.43 113 Alnath 05:26:17.6 +28:36:22 1.6 10.37 126 PPM 093742 04:45:42.5 +23:37:41 6.1 2.47 116 PPM 093881 04:54:49.3 +22:08:46 8.5 0.77 118 PPM 093852 04:53:06.1 +21:53:23 9.9 0.31 118 32499_00YS11 04:52:12.8 +21:39:52 16.5 118 Positions are for J2000