Occultation event with (15502) 99NV27, event index number 4140
Regions able to see the event: Europe
Geocentric closest approach at 2026/08/31 23:10:34 UTC
J2000 position of star is 04:22:46.7 +37:54:14
Equinox of date position of star is 04:24:34.1 +37:57:52
Star is 46 degrees from the moon. Moon is 84% illuminated.
Stellar brightness G=13.7, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 9.5 per integration for unocculted signal
Expected flux drop is 86% with SNR of 8.1 for the occulted depth (per occulted point)
Apparent velocity is 14.9 km/sec on the sky relative to the star, or, 14.7 arcsec/hr.
Position angle of asteroid motion is 55.7 degrees
The recommended exposure time corresponds to 3.0 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 22.8 km.
The sky-plane scale is 3641.2 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2026/08/31 23:11UT) Object RA Dec mag sep mel Aldebaran 04:37:27.2 +16:33:39 0.8 21.59 46 44Zet Per 03:55:48.9 +31:57:38 2.8 8.41 38 50 Per 04:10:23.7 +38:06:26 5.5 2.79 43 PPM 069352 04:23:04.1 +38:18:19 8.0 0.45 46 PPM 069368 04:24:41.0 +38:00:43 9.0 0.05 46 15502_99NV27 04:24:34.1 +37:57:52 15.6 46 Positions are for equinox of date
Star training set for 15502_99NV27, (2026/08/31 23:11UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.59 46 44Zet Per 03:54:07.9 +31:53:01 2.8 8.41 38 50 Per 04:08:37.0 +38:02:18 5.5 2.79 43 PPM 069352 04:21:16.5 +38:14:38 8.0 0.45 46 PPM 069368 04:22:53.6 +37:57:05 9.0 0.05 46 15502_99NV27 04:22:46.7 +37:54:14 15.6 46 Positions are for J2000