Occultation event with (23958) 98VD30, event index number 3158
Regions able to see the event: Europe
Geocentric closest approach at 2026/01/19 04:29:32 UTC
J2000 position of star is 11:50:15.2 -22:17:16
Equinox of date position of star is 11:51:34.8 -22:25:58
Star is 113 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=10.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 41.9 per integration for unocculted signal
Expected flux drop is 99% with SNR of 41.4 for the occulted depth (per occulted point)
Apparent velocity is 5.8 km/sec on the sky relative to the star, or, 6.2 arcsec/hr.
Position angle of asteroid motion is 13.0 degrees
The recommended exposure time corresponds to 0.7 km per image.
The 1-sigma error in the time of the event is 6.8 seconds.
The 1-sigma cross-track error in the shadow position is 12.7 km.
The sky-plane scale is 3333.6 km/arcsec.
Diameter estimates:
55.5 km assuming a 5% albedo, maximum of 9.6 sec for a central chord
22.6 km assuming a 30% albedo, maximum of 3.9 sec for a central chord
Cross-track diameter of 46.0 km used for deployment plan.
Star training set for 23958_98VD30, (2026/01/19 04:30UT) Object RA Dec mag sep mel Spica 13:26:34.2 -11:17:47 1.0 25.25 99 4Gam Crv 12:17:09.0 -17:41:11 2.6 7.65 111 PPM 259219 11:38:18.5 -23:05:31 6.5 3.13 115 PPM 259533 11:52:08.8 -22:17:19 8.3 0.19 113 23958_98VD30 11:51:34.8 -22:25:58 15.5 113 Positions are for equinox of date
Star training set for 23958_98VD30, (2026/01/19 04:30UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 25.25 99 4Gam Crv 12:15:48.1 -17:32:30 2.6 7.65 111 PPM 259219 11:36:59.8 -22:56:52 6.5 3.13 115 PPM 259533 11:50:49.2 -22:08:38 8.3 0.19 113 23958_98VD30 11:50:15.2 -22:17:16 15.5 113 Positions are for J2000