Occultation event with (11397) 98XX93, event index number 1728
Regions able to see the event: US
Geocentric closest approach at 2025/12/27 13:21:31 UTC
J2000 position of star is 13:14:05.1 -27:21:19
Equinox of date position of star is 13:15:30.8 -27:29:33
Star is 151 degrees from the moon. Moon is 47% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 57% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 23.9 km/sec on the sky relative to the star, or, 20.4 arcsec/hr.
Position angle of asteroid motion is 128.1 degrees
The recommended exposure time corresponds to 11.9 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 23.0 km.
The sky-plane scale is 4206.3 km/arcsec.
Diameter estimates:
54.5 km assuming a 5% albedo, aximum of 2.3 sec for a central chord
22.2 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 45.4 km used for deployment plan.
Star training set for 11397_98XX93, (2025/12/27 13:22UT) Object RA Dec mag sep mel Spica 13:26:34.0 -11:17:46 1.0 16.40 159 Iot Cen 13:22:04.0 -36:50:55 2.8 9.46 142 PPM 261317 13:13:04.4 -26:41:21 6.5 0.97 152 PPM 261383 13:15:44.5 -27:43:25 9.9 0.24 151 11397_98XX93 13:15:30.8 -27:29:33 16.2 151 Positions are for equinox of date
Star training set for 11397_98XX93, (2025/12/27 13:22UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 16.40 159 Iot Cen 13:20:35.1 -36:42:46 2.8 9.46 142 PPM 261317 13:11:39.1 -26:33:06 6.5 0.97 152 PPM 261383 13:14:18.7 -27:35:12 9.9 0.24 151 11397_98XX93 13:14:05.1 -27:21:19 16.2 151 Positions are for J2000