Occultation event with (15502) 99NV27, event index number 1387
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/19 11:06:17 UTC
J2000 position of star is 01:23:30.5 +30:59:55
Equinox of date position of star is 01:24:57.3 +31:07:58
Star is 147 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.35 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 18% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
Position angle of asteroid motion is 71.0 degrees
The recommended exposure time corresponds to 22.6 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 18.1 km.
The sky-plane scale is 3034.5 km/arcsec.
Diameter estimates:
57.5 km assuming a 5% albedo, aximum of 3.4 sec for a central chord
23.5 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 53.1 km used for deployment plan.
Star training set for 15502_99NV27, (2025/10/19 11:06UT) Object RA Dec mag sep mel Aldebaran 04:37:24.2 +16:33:32 0.8 45.96 114 Hamal 02:08:38.0 +23:34:59 2.0 12.28 145 82 Psc 01:12:32.6 +31:33:40 5.2 2.68 148 PPM 066207 01:23:38.5 +31:50:26 8.3 0.76 147 PPM 066230 01:25:01.1 +31:04:58 8.9 0.05 147 15502_99NV27 01:24:57.3 +31:07:58 14.9 147 Positions are for equinox of date
Star training set for 15502_99NV27, (2025/10/19 11:06UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 45.96 114 Hamal 02:07:10.8 +23:27:41 2.0 12.28 145 82 Psc 01:11:06.8 +31:25:28 5.2 2.68 148 PPM 066207 01:22:11.6 +31:42:22 8.3 0.76 147 PPM 066230 01:23:34.3 +30:56:55 8.9 0.05 147 15502_99NV27 01:23:30.5 +30:59:55 14.9 147 Positions are for J2000