Occultation event with (23958) 98VD30, event index number 835
Regions able to see the event: Europe,SAfrica
Geocentric closest approach at 2025/03/20 22:19:54 UTC
J2000 position of star is 08:43:26.0 -12:01:17
Equinox of date position of star is 08:44:38.1 -12:06:49
Star is 110 degrees from the moon. Moon is 65% illuminated.
Stellar brightness G=16.9, apparent brightess of occulting body is G=15.1
Use an exposure time of 1.95 seconds with the standard RECON-QHY system.
Expected flux drop is 83% with SNR of 3.0 per integration
Apparent velocity is 12.8 km/sec on the sky relative to the star, or, 15.3 arcsec/hr.
The recommended exposure time corresponds to 24.9 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 38.6 km.
The sky-plane scale is 2996.6 km/arcsec.
Diameter estimates:
54.5 km assuming a 5% albedo, aximum of 4.3 sec for a central chord
22.2 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 54.5 km used for deployment plan.
Star training set for 23958_98VD30, (2025/03/20 22:20UT) Object RA Dec mag sep mel Sirius 06:46:15.5 -16:45:08 -1.5 29.00 127 Alphard 09:28:49.6 -08:46:09 2.0 11.37 102 6 Hya 08:41:13.1 -12:33:57 5.0 0.95 110 PPM 220502 08:43:21.9 -12:03:27 6.9 0.32 110 23958_98VD30 08:44:38.1 -12:06:49 15.1 109 Positions are for equinox of date
Star training set for 23958_98VD30, (2025/03/20 22:20UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:28 -1.5 29.00 127 Alphard 09:27:35.2 -08:39:30 2.0 11.37 102 6 Hya 08:40:01.3 -12:28:32 5.0 0.95 110 PPM 220502 08:42:09.7 -11:57:58 6.9 0.32 110 23958_98VD30 08:43:26.0 -12:01:17 15.1 110 Positions are for J2000