Occultation event with (15502) 99NV27, event index number 1637
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/12/04 20:04:36 UTC
J2000 position of star is 01:04:11.9 +28:00:53
Equinox of date position of star is 01:05:36.8 +28:09:12
Star is 46 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 12.2 per integration for unocculted signal
Expected flux drop is 90% with SNR of 11.0 for the occulted depth (per occulted point)
Apparent velocity is 9.9 km/sec on the sky relative to the star, or, 11.1 arcsec/hr.
Position angle of asteroid motion is 25.6 degrees
The recommended exposure time corresponds to 1.2 km per image.
The 1-sigma error in the time of the event is 2.6 seconds.
The 1-sigma cross-track error in the shadow position is 1.4 km.
The sky-plane scale is 3211.1 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, maximum of 5.8 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2025/12/04 20:05UT) Object RA Dec mag sep mel Aldebaran 04:37:24.7 +16:33:33 0.8 49.93 11 6Bet Ari 01:56:04.7 +20:56:01 2.6 13.54 37 68 Psc 00:59:14.8 +29:07:54 5.4 1.71 47 PPM 090411 01:04:00.5 +27:53:13 7.1 0.44 47 PPM 090431 01:05:13.3 +28:01:14 9.4 0.16 46 PPM 090440 01:05:36.8 +28:09:12 10.8 0.00 46 15502_99NV27 01:05:36.8 +28:09:12 15.3 46 Positions are for equinox of date
Star training set for 15502_99NV27, (2025/12/04 20:05UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 49.93 11 6Bet Ari 01:54:38.6 +20:48:26 2.6 13.54 37 68 Psc 00:57:50.2 +28:59:32 5.4 1.71 47 PPM 090411 01:02:35.8 +27:44:53 7.1 0.44 47 PPM 090431 01:03:48.5 +27:52:55 9.4 0.16 46 PPM 090440 01:04:12.0 +28:00:54 10.8 0.00 46 15502_99NV27 01:04:11.9 +28:00:53 15.3 46 Positions are for J2000