Occultation event with (15502) 99NV27, event index number 3999
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/13 20:13:02 UTC
J2000 position of star is 04:13:19.0 +36:51:54
Equinox of date position of star is 04:15:04.8 +36:55:51
Star is 88 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 5.9 per integration for unocculted signal
Expected flux drop is 60% with SNR of 3.5 for the occulted depth (per occulted point)
Apparent velocity is 22.1 km/sec on the sky relative to the star, or, 20.8 arcsec/hr.
Position angle of asteroid motion is 64.6 degrees
The recommended exposure time corresponds to 13.3 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 24.9 km.
The sky-plane scale is 3835.0 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, maximum of 2.6 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2026/08/13 20:13UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 20.96 86 44Zet Per 03:55:48.7 +31:57:38 2.8 6.36 93 50 Per 04:10:23.5 +38:06:25 5.5 1.50 89 PPM 069246 04:16:43.9 +36:34:01 7.6 0.49 88 PPM 069225 04:15:40.1 +37:00:46 9.7 0.14 88 15502_99NV27 04:15:04.8 +36:55:51 15.7 88 Positions are for equinox of date
Star training set for 15502_99NV27, (2026/08/13 20:13UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 20.96 86 44Zet Per 03:54:07.9 +31:53:01 2.8 6.36 93 50 Per 04:08:37.0 +38:02:18 5.5 1.50 89 PPM 069246 04:14:58.3 +36:30:07 7.6 0.49 88 PPM 069225 04:13:54.3 +36:56:50 9.7 0.14 88 15502_99NV27 04:13:19.0 +36:51:54 15.7 88 Positions are for J2000