Occultation event with (32499) 00YS11, event index number 1338
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/05 12:47:42 UTC
J2000 position of star is 03:14:58.1 +08:19:12
Equinox of date position of star is 03:16:21.2 +08:24:51
Star is 59 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=13.6, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.18 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 86% with SNR of 8.3 for the occulted depth (per occulted point)
Apparent velocity is 11.7 km/sec on the sky relative to the star, or, 14.0 arcsec/hr.
Position angle of asteroid motion is 79.2 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 24.4 km.
The sky-plane scale is 3005.1 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, aximum of 3.8 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2025/10/05 12:48UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 21.37 80 Menkar 03:03:37.8 +04:11:21 2.5 5.28 55 PPM 146333 03:13:48.6 +06:45:22 5.6 1.77 58 PPM 146336 03:13:58.2 +08:41:20 8.3 0.65 58 PPM 146355 03:14:56.4 +07:53:38 9.2 0.63 58 PPM 146395 03:17:57.2 +08:18:32 10.9 0.41 59 32499_00YS11 03:16:21.2 +08:24:51 15.5 59 Positions are for equinox of date
Star training set for 32499_00YS11, (2025/10/05 12:48UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.37 80 Menkar 03:02:16.8 +04:05:21 2.5 5.28 55 PPM 146333 03:12:26.3 +06:39:39 5.6 1.77 58 PPM 146336 03:12:35.1 +08:35:37 8.3 0.65 58 PPM 146355 03:13:33.6 +07:47:56 9.2 0.63 58 PPM 146395 03:16:34.2 +08:12:55 10.9 0.41 59 32499_00YS11 03:14:58.1 +08:19:12 15.5 59 Positions are for J2000