Occultation event with (20424) 98VF30, event index number 1042
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/08 23:05:24 UTC
J2000 position of star is 10:21:24.9 +36:13:31
Equinox of date position of star is 10:22:53.4 +36:05:47
Star is 91 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 62% with SNR of 2.0 for the occulted depth (per occulted point)
Apparent velocity is 27.2 km/sec on the sky relative to the star, or, 25.3 arcsec/hr.
Position angle of asteroid motion is 317.6 degrees
The recommended exposure time corresponds to 10.9 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 34.2 km.
The sky-plane scale is 3866.8 km/arcsec.
Diameter estimates:
45.1 km assuming a 5% albedo, aximum of 1.7 sec for a central chord
18.4 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 45.1 km used for deployment plan.
Star training set for 20424_98VF30, (2025/06/08 23:05UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 24.44 82 68Del Leo 11:15:27.5 +20:23:02 2.6 19.47 73 31Bet LMi 10:29:20.8 +36:34:34 4.2 1.39 90 PPM 075206 10:26:58.6 +36:04:28 7.6 0.83 90 PPM 075159 10:23:12.0 +36:24:09 11.0 0.31 91 20424_98VF30 10:22:53.4 +36:05:47 16.3 90 Positions are for equinox of date
Star training set for 20424_98VF30, (2025/06/08 23:05UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 24.44 82 68Del Leo 11:14:06.7 +20:31:22 2.6 19.47 73 31Bet LMi 10:27:52.8 +36:42:24 4.2 1.39 90 PPM 075206 10:25:30.5 +36:12:16 7.6 0.83 90 PPM 075159 10:21:43.4 +36:31:53 11.0 0.31 91 20424_98VF30 10:21:24.9 +36:13:31 16.3 91 Positions are for J2000