Occultation event with (23958) 98VD30, event index number 3754
Regions able to see the event: NZ
Geocentric closest approach at 2026/05/20 10:39:12 UTC
J2000 position of star is 11:15:45.6 -15:00:24
Equinox of date position of star is 11:17:04.9 -15:09:03
Star is 68 degrees from the moon. Moon is 19% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 9.2 per integration for unocculted signal
Expected flux drop is 59% with SNR of 5.4 for the occulted depth (per occulted point)
Apparent velocity is 11.8 km/sec on the sky relative to the star, or, 12.8 arcsec/hr.
Position angle of asteroid motion is 20.2 degrees
The recommended exposure time corresponds to 11.2 km per image.
The 1-sigma error in the time of the event is 3.1 seconds.
The 1-sigma cross-track error in the shadow position is 19.5 km.
The sky-plane scale is 3330.4 km/arcsec.
Diameter estimates:
55.5 km assuming a 5% albedo, maximum of 4.7 sec for a central chord
22.6 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 46.0 km used for deployment plan.
Star training set for 23958_98VD30, (2026/05/20 10:39UT) Object RA Dec mag sep mel Regulus 10:09:46.5 +11:50:14 1.3 31.72 40 4Gam Crv 12:17:10.0 -17:41:18 2.6 14.63 82 12Del Crt 11:20:39.7 -14:55:18 3.6 0.89 69 PPM 224110 11:15:04.0 -15:08:05 8.4 0.49 68 PPM 224147 11:16:27.2 -15:17:26 8.9 0.21 68 23958_98VD30 11:17:04.9 -15:09:03 15.5 69 Positions are for equinox of date
Star training set for 23958_98VD30, (2026/05/20 10:39UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 31.72 40 4Gam Crv 12:15:48.1 -17:32:30 2.6 14.63 82 12Del Crt 11:19:20.2 -14:46:38 3.6 0.89 69 PPM 224110 11:13:44.7 -14:59:27 8.4 0.49 68 PPM 224147 11:15:07.9 -15:08:48 8.9 0.21 68 23958_98VD30 11:15:45.6 -15:00:24 15.5 68 Positions are for J2000