Occultation event with (32499) 00YS11, event index number 1417
Regions able to see the event: NMexico,SMexico
Geocentric closest approach at 2025/10/26 06:28:03 UTC
J2000 position of star is 03:05:12.1 +07:56:38
Equinox of date position of star is 03:06:35.0 +08:02:35
Star is 139 degrees from the moon. Moon is 19% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 6.5 per integration for unocculted signal
Expected flux drop is 55% with SNR of 3.5 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 20.5 arcsec/hr.
Position angle of asteroid motion is 82.9 degrees
The recommended exposure time corresponds to 9.2 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 25.7 km.
The sky-plane scale is 2928.4 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, aximum of 2.7 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2025/10/26 06:28UT) Object RA Dec mag sep mel Aldebaran 04:37:24.3 +16:33:33 0.8 23.73 162 Menkar 03:03:37.9 +04:11:22 2.5 3.92 136 91Lam Cet 03:01:06.1 +09:00:31 4.7 1.66 138 PPM 146197 03:05:20.2 +07:22:52 7.9 0.73 138 PPM 146206 03:06:13.3 +08:12:47 9.7 0.19 139 32499_00YS11 03:06:35.0 +08:02:35 15.3 139 Positions are for equinox of date
Star training set for 32499_00YS11, (2025/10/26 06:28UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 23.73 162 Menkar 03:02:16.8 +04:05:21 2.5 3.92 136 91Lam Cet 02:59:42.9 +08:54:26 4.7 1.66 138 PPM 146197 03:03:57.7 +07:16:54 7.9 0.73 138 PPM 146206 03:04:50.3 +08:06:50 9.7 0.19 139 32499_00YS11 03:05:12.1 +07:56:38 15.3 139 Positions are for J2000