Occultation event with (23958) 98VD30, event index number 1511
Regions able to see the event: Senegal
Geocentric closest approach at 2025/11/14 05:10:17 UTC
J2000 position of star is 11:27:11.9 -17:08:24
Equinox of date position of star is 11:28:30.0 -17:16:57
Star is 24 degrees from the moon. Moon is 30% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.8
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 47% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 31.1 km/sec on the sky relative to the star, or, 28.1 arcsec/hr.
Position angle of asteroid motion is 121.8 degrees
The recommended exposure time corresponds to 15.5 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 31.8 km.
The sky-plane scale is 3976.0 km/arcsec.
Diameter estimates:
55.5 km assuming a 5% albedo, aximum of 1.8 sec for a central chord
22.6 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 46.0 km used for deployment plan.
Star training set for 23958_98VD30, (2025/11/14 05:10UT) Object RA Dec mag sep mel Spica 13:26:33.6 -11:17:44 1.0 29.19 39 4Gam Crv 12:17:08.4 -17:41:08 2.6 11.60 29 15Gam Crt 11:26:10.6 -17:49:35 4.1 0.78 24 PPM 224472 11:30:32.0 -17:29:39 8.3 0.53 24 PPM 224421 11:28:30.0 -17:37:56 9.8 0.35 24 23958_98VD30 11:28:30.0 -17:16:57 15.8 24 Positions are for equinox of date
Star training set for 23958_98VD30, (2025/11/14 05:10UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 29.19 39 4Gam Crv 12:15:48.1 -17:32:30 2.6 11.60 29 15Gam Crt 11:24:52.8 -17:41:02 4.1 0.78 24 PPM 224472 11:29:13.9 -17:21:05 8.3 0.53 24 PPM 224421 11:27:12.0 -17:29:23 9.8 0.35 24 23958_98VD30 11:27:11.9 -17:08:24 15.8 24 Positions are for J2000