Occultation event with (15502) 99NV27, event index number 1238
Regions able to see the event: Europe,UAE
Geocentric closest approach at 2025/08/16 21:21:21 UTC
J2000 position of star is 01:47:09.4 +30:04:23
Equinox of date position of star is 01:48:37.2 +30:12:01
Star is 30 degrees from the moon. Moon is 42% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.40 seconds with the standard RECON-QHY system.
SNR of 3.1 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 9.3 km/sec on the sky relative to the star, or, 9.8 arcsec/hr.
Position angle of asteroid motion is 0.1 degrees
The recommended exposure time corresponds to 13.1 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 9.6 km.
The sky-plane scale is 3438.8 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, maximum of 6.2 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 2.5 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2025/08/16 21:21UT) Object RA Dec mag sep mel Aldebaran 04:37:23.6 +16:33:31 0.8 40.79 12 Hamal 02:08:37.4 +23:34:57 2.0 7.98 26 2Alp Tri 01:54:33.0 +29:42:09 3.4 1.38 28 PPM 066663 01:51:52.3 +30:55:46 8.4 1.01 29 PPM 066605 01:48:06.9 +30:19:17 9.2 0.16 30 15502_99NV27 01:48:37.2 +30:12:01 15.5 29 Positions are for equinox of date
Star training set for 15502_99NV27, (2025/08/16 21:21UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 40.79 12 Hamal 02:07:10.8 +23:27:41 2.0 7.98 26 2Alp Tri 01:53:04.9 +29:34:38 3.4 1.38 28 PPM 066663 01:50:23.9 +30:48:12 8.4 1.01 29 PPM 066605 01:46:39.1 +30:11:39 9.2 0.16 30 15502_99NV27 01:47:09.4 +30:04:23 15.5 30 Positions are for J2000