Occultation event with (11397) 98XX93, event index number 1039
Regions able to see the event: Australia
Geocentric closest approach at 2025/06/07 13:52:24 UTC
J2000 position of star is 10:49:40.1 -15:37:34
Equinox of date position of star is 10:50:55.4 -15:45:40
Star is 48 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 4.0 per integration for unocculted signal
Expected flux drop is 49% with SNR of 1.9 for the occulted depth (per occulted point)
Apparent velocity is 14.8 km/sec on the sky relative to the star, or, 13.9 arcsec/hr.
Position angle of asteroid motion is 14.5 degrees
The recommended exposure time corresponds to 13.4 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 21.4 km.
The sky-plane scale is 3848.6 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 54.0 km used for deployment plan.
Star training set for 11397_98XX93, (2025/06/07 13:52UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 29.42 66 4Gam Crv 12:17:07.1 -17:40:59 2.6 20.72 27 Nu Hya 10:50:52.9 -16:19:39 3.1 0.57 48 PPM 223501 10:50:21.9 -15:17:59 8.0 0.48 48 PPM 223499 10:50:15.3 -15:41:39 9.6 0.17 48 11397_98XX93 10:50:55.4 -15:45:40 16.0 47 Positions are for equinox of date
Star training set for 11397_98XX93, (2025/06/07 13:52UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 29.42 66 4Gam Crv 12:15:48.1 -17:32:30 2.6 20.72 27 Nu Hya 10:49:37.7 -16:11:32 3.1 0.57 48 PPM 223501 10:49:06.5 -15:09:53 8.0 0.48 48 PPM 223499 10:49:00.0 -15:33:34 9.6 0.17 48 11397_98XX93 10:49:40.1 -15:37:34 16.0 48 Positions are for J2000