Occultation event with (11397) 98XX93, event index number 937
Regions able to see the event: Australia
Geocentric closest approach at 2025/04/30 10:59:05 UTC
J2000 position of star is 10:43:53.2 -17:46:45
Equinox of date position of star is 10:45:07.6 -17:54:45
Star is 94 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.7
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 5.2 per integration for unocculted signal
Expected flux drop is 44% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 11.2 km/sec on the sky relative to the star, or, 11.5 arcsec/hr.
Position angle of asteroid motion is 106.5 degrees
The recommended exposure time corresponds to 13.4 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 36.5 km.
The sky-plane scale is 3475.7 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, aximum of 4.8 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 11397_98XX93, (2025/04/30 10:59UT) Object RA Dec mag sep mel Regulus 10:09:43.1 +11:50:33 1.3 31.01 72 Alphard 09:28:49.9 -08:46:11 2.0 20.66 73 PPM 223444 10:48:06.7 -17:25:52 5.7 0.86 94 PPM 223344 10:43:54.4 -17:51:46 8.3 0.29 94 PPM 223367 10:44:43.4 -18:07:39 9.5 0.24 94 11397_98XX93 10:45:07.6 -17:54:45 15.7 94 Positions are for equinox of date
Star training set for 11397_98XX93, (2025/04/30 10:59UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 31.01 72 Alphard 09:27:35.2 -08:39:30 2.0 20.66 73 PPM 223444 10:46:52.1 -17:17:50 5.7 0.86 94 PPM 223344 10:42:40.0 -17:43:47 8.3 0.29 94 PPM 223367 10:43:29.1 -17:59:39 9.5 0.24 94 11397_98XX93 10:43:53.2 -17:46:45 15.7 94 Positions are for J2000