Occultation event with (32499) 00YS11, event index number 1638
Regions able to see the event: Europe
Geocentric closest approach at 2025/12/04 21:45:42 UTC
J2000 position of star is 02:43:39.5 +07:44:29
Equinox of date position of star is 02:45:02.4 +07:51:01
Star is 34 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 38% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 13.8 km/sec on the sky relative to the star, or, 16.3 arcsec/hr.
Position angle of asteroid motion is 96.2 degrees
The recommended exposure time corresponds to 9.7 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 29.4 km.
The sky-plane scale is 3039.4 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, aximum of 3.3 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 38.9 km used for deployment plan.
Star training set for 32499_00YS11, (2025/12/04 21:46UT) Object RA Dec mag sep mel Aldebaran 04:37:24.7 +16:33:33 0.8 28.77 11 Menkar 03:03:38.3 +04:11:24 2.5 5.90 33 PPM 145768 02:39:23.6 +07:48:22 6.2 1.40 35 PPM 145853 02:45:32.0 +07:29:43 8.4 0.38 34 PPM 145847 02:45:05.3 +08:08:28 10.4 0.29 33 32499_00YS11 02:45:02.4 +07:51:01 15.5 33 Positions are for equinox of date
Star training set for 32499_00YS11, (2025/12/04 21:46UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 28.77 11 Menkar 03:02:16.8 +04:05:21 2.5 5.90 33 PPM 145768 02:38:00.9 +07:41:42 6.2 1.40 35 PPM 145853 02:44:09.3 +07:23:12 8.4 0.38 34 PPM 145847 02:43:42.4 +08:01:56 10.4 0.29 33 32499_00YS11 02:43:39.5 +07:44:29 15.5 34 Positions are for J2000