Occultation event with (15502) 99NV27, event index number 3834
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/07 10:10:14 UTC
J2000 position of star is 03:43:58.5 +34:31:48
Equinox of date position of star is 03:45:40.3 +34:36:44
Star is 52 degrees from the moon. Moon is 54% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 43% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 34.5 km/sec on the sky relative to the star, or, 29.8 arcsec/hr.
Position angle of asteroid motion is 70.8 degrees
The recommended exposure time corresponds to 22.4 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 25.1 km.
The sky-plane scale is 4176.1 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2026/07/07 10:10UT) Object RA Dec mag sep mel Aldebaran 04:37:26.7 +16:33:37 0.8 21.45 60 44Zet Per 03:55:48.3 +31:57:36 2.8 3.39 53 40 Per 03:44:03.9 +34:02:53 4.8 0.65 51 PPM 068723 03:45:05.5 +34:11:55 7.6 0.43 51 PPM 068735 03:45:48.8 +34:46:50 10.6 0.17 52 15502_99NV27 03:45:40.3 +34:36:44 15.8 52 Positions are for equinox of date
Star training set for 15502_99NV27, (2026/07/07 10:10UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.45 60 44Zet Per 03:54:07.9 +31:53:01 2.8 3.39 53 40 Per 03:42:22.6 +33:57:54 4.8 0.65 51 PPM 068723 03:43:24.0 +34:06:58 7.6 0.43 51 PPM 068735 03:44:06.9 +34:41:55 10.6 0.17 52 15502_99NV27 03:43:58.5 +34:31:48 15.8 52 Positions are for J2000