Occultation event with (15502) 99NV27, event index number 1043
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/09 08:00:47 UTC
J2000 position of star is 01:20:36.5 +23:53:18
Equinox of date position of star is 01:21:59.9 +24:01:16
Star is 150 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 48% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 32.3 km/sec on the sky relative to the star, or, 28.1 arcsec/hr.
The recommended exposure time corresponds to 17.8 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 34.2 km.
The sky-plane scale is 4134.5 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, aximum of 1.8 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 57.5 km used for deployment plan.
Star training set for 15502_99NV27, (2025/06/09 08:01UT) Object RA Dec mag sep mel Aldebaran 04:37:23.0 +16:33:30 0.8 46.20 163 6Bet Ari 01:56:03.0 +20:55:53 2.6 8.45 157 PPM 090772 01:26:59.4 +23:38:35 6.5 1.20 151 PPM 090734 01:24:39.1 +24:39:07 8.2 0.87 151 PPM 090699 01:22:34.3 +24:00:12 9.6 0.13 150 15502_99NV27 01:21:59.9 +24:01:16 15.9 150 Positions are for equinox of date
Star training set for 15502_99NV27, (2025/06/09 08:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 46.20 163 6Bet Ari 01:54:38.6 +20:48:26 2.6 8.45 157 PPM 090772 01:25:35.7 +23:30:41 6.5 1.20 151 PPM 090734 01:23:15.3 +24:31:11 8.2 0.87 151 PPM 090699 01:21:10.8 +23:52:15 9.6 0.13 150 15502_99NV27 01:20:36.5 +23:53:18 15.9 150 Positions are for J2000