Occultation event with (15502) 99NV27, event index number 1210
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/05 21:10:06 UTC
J2000 position of star is 01:46:20.5 +29:17:34
Equinox of date position of star is 01:47:47.9 +29:25:12
Star is 123 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.6
Use an exposure time of 1.50 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 26% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 12.2 km/sec on the sky relative to the star, or, 12.4 arcsec/hr.
Position angle of asteroid motion is 22.6 degrees
The recommended exposure time corresponds to 18.3 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 0.6 km.
The sky-plane scale is 3553.6 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, aximum of 4.7 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2025/08/05 21:10UT) Object RA Dec mag sep mel Aldebaran 04:37:23.5 +16:33:31 0.8 40.84 155 Hamal 02:08:37.3 +23:34:56 2.0 7.47 126 2Alp Tri 01:54:32.9 +29:42:09 3.4 1.49 125 PPM 091041 01:46:18.1 +28:35:09 7.4 0.90 123 PPM 091059 01:47:28.3 +29:17:30 9.5 0.15 123 15502_99NV27 01:47:47.9 +29:25:12 15.6 124 Positions are for equinox of date
Star training set for 15502_99NV27, (2025/08/05 21:10UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 40.84 155 Hamal 02:07:10.8 +23:27:41 2.0 7.47 126 2Alp Tri 01:53:04.9 +29:34:38 3.4 1.49 125 PPM 091041 01:44:51.2 +28:27:29 7.4 0.90 123 PPM 091059 01:46:01.0 +29:09:51 9.5 0.15 123 15502_99NV27 01:46:20.5 +29:17:34 15.6 123 Positions are for J2000