Occultation event with (15502) 99NV27, event index number 1336
Regions able to see the event: Europe,SAmericaN
Geocentric closest approach at 2025/10/05 00:50:31 UTC
J2000 position of star is 01:31:50.2 +31:26:06
Equinox of date position of star is 01:33:17.7 +31:34:01
Star is 53 degrees from the moon. Moon is 94% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 8.2 per integration for unocculted signal
Expected flux drop is 48% with SNR of 4.0 for the occulted depth (per occulted point)
Apparent velocity is 15.3 km/sec on the sky relative to the star, or, 17.9 arcsec/hr.
Position angle of asteroid motion is 81.9 degrees
The recommended exposure time corresponds to 13.0 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 21.6 km.
The sky-plane scale is 3068.2 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, aximum of 3.8 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2025/10/05 00:51UT) Object RA Dec mag sep mel Aldebaran 04:37:24.1 +16:33:32 0.8 44.25 87 Hamal 02:08:37.9 +23:34:59 2.0 11.17 55 PPM 066368 01:33:36.2 +34:55:54 6.4 3.37 55 PPM 066336 01:30:54.8 +31:01:35 8.4 0.74 52 PPM 066376 01:33:46.8 +32:02:41 10.0 0.49 53 PPM 066387 01:34:33.5 +31:44:38 11.0 0.32 53 15502_99NV27 01:33:17.7 +31:34:01 15.0 53 Positions are for equinox of date
Star training set for 15502_99NV27, (2025/10/05 00:51UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 44.25 87 Hamal 02:07:10.8 +23:27:41 2.0 11.17 55 PPM 066368 01:32:07.6 +34:48:00 6.4 3.37 55 PPM 066336 01:29:27.7 +30:53:38 8.4 0.74 52 PPM 066376 01:32:19.1 +31:54:46 10.0 0.49 53 PPM 066387 01:33:05.9 +31:36:45 11.0 0.32 53 15502_99NV27 01:31:50.2 +31:26:06 15.0 53 Positions are for J2000