Occultation event with (11397) 98XX93, event index number 834
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/03/20 21:47:51 UTC
J2000 position of star is 10:55:48.1 -20:50:59
Equinox of date position of star is 10:57:02.2 -20:59:05
Star is 78 degrees from the moon. Moon is 65% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
Expected flux drop is 59% with SNR of 4.3 per integration
Apparent velocity is 17.2 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
The recommended exposure time corresponds to 12.9 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 25.0 km.
The sky-plane scale is 3274.2 km/arcsec.
Diameter estimates:
53.5 km assuming a 5% albedo, aximum of 3.1 sec for a central chord
21.8 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 53.5 km used for deployment plan.
Star training set for 11397_98XX93, (2025/03/20 21:48UT) Object RA Dec mag sep mel Regulus 10:09:42.7 +11:50:35 1.3 34.83 103 4Gam Crv 12:17:06.4 -17:40:54 2.6 19.16 62 PPM 258298 10:56:25.6 -20:48:00 6.4 0.23 78 11397_98XX93 10:57:02.2 -20:59:05 15.4 77 Positions are for equinox of date
Star training set for 11397_98XX93, (2025/03/20 21:48UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 34.83 103 4Gam Crv 12:15:48.1 -17:32:30 2.6 19.16 62 PPM 258298 10:55:11.6 -20:39:54 6.4 0.23 78 11397_98XX93 10:55:48.1 -20:50:59 15.4 78 Positions are for J2000