Occultation event with (23958) 98VD30, event index number 3264
Regions able to see the event: SMexico
Geocentric closest approach at 2026/02/18 10:55:27 UTC
J2000 position of star is 11:43:26.8 -22:36:21
Equinox of date position of star is 11:44:46.1 -22:45:04
Star is 148 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.2
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 23% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 11.9 km/sec on the sky relative to the star, or, 13.8 arcsec/hr.
Position angle of asteroid motion is 104.0 degrees
The recommended exposure time corresponds to 13.0 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 38.9 km.
The sky-plane scale is 3090.8 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, (2026/02/18 10:55UT) Object RA Dec mag sep mel Spica 13:26:34.4 -11:17:49 1.0 26.83 138 4Gam Crv 12:17:09.2 -17:41:13 2.6 9.13 148 PPM 259219 11:38:18.7 -23:05:33 6.5 1.53 148 PPM 259431 11:47:49.5 -23:13:05 8.4 0.84 147 PPM 259382 11:45:23.2 -22:41:20 8.8 0.16 148 23958_98VD30 11:44:46.1 -22:45:04 15.2 147 Positions are for equinox of date
Star training set for 23958_98VD30, (2026/02/18 10:55UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 26.83 138 4Gam Crv 12:15:48.1 -17:32:30 2.6 9.13 148 PPM 259219 11:36:59.8 -22:56:52 6.5 1.53 148 PPM 259431 11:46:30.0 -23:04:22 8.4 0.84 147 PPM 259382 11:44:03.8 -22:32:38 8.8 0.16 148 23958_98VD30 11:43:26.8 -22:36:21 15.2 148 Positions are for J2000