Occultation event with (11397) 98XX93, event index number 873
Regions able to see the event: Australia
Geocentric closest approach at 2025/04/01 15:08:04 UTC
J2000 position of star is 10:50:44.4 -20:02:08
Equinox of date position of star is 10:51:58.4 -20:10:11
Star is 115 degrees from the moon. Moon is 15% illuminated.
Stellar brightness G=11.8, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
Expected flux drop is 3% with SNR of 23.4 per integration
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 17.7 arcsec/hr.
The recommended exposure time corresponds to 1.9 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 31.3 km.
The sky-plane scale is 3302.3 km/arcsec.
Diameter estimates:
53.5 km assuming a 5% albedo, aximum of 3.3 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, (2025/04/01 15:08UT) Object RA Dec mag sep mel Regulus 10:09:42.8 +11:50:34 1.3 33.66 93 4Gam Crv 12:17:06.5 -17:40:55 2.6 20.27 134 PPM 258298 10:56:25.7 -20:48:00 6.4 1.22 116 PPM 223592 10:54:07.8 -19:41:45 8.1 0.69 115 PPM 258203 10:51:58.5 -20:10:13 8.7 0.00 115 11397_98XX93 10:51:58.4 -20:10:11 15.5 115 Positions are for equinox of date
Star training set for 11397_98XX93, (2025/04/01 15:08UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 33.66 93 4Gam Crv 12:15:48.1 -17:32:30 2.6 20.27 134 PPM 258298 10:55:11.6 -20:39:54 6.4 1.22 116 PPM 223592 10:52:53.6 -19:33:40 8.1 0.69 115 PPM 258203 10:50:44.5 -20:02:10 8.7 0.00 115 11397_98XX93 10:50:44.4 -20:02:08 15.5 115 Positions are for J2000