Occultation event with (13385) 98XO79, event index number 1064
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/15 23:29:10 UTC
J2000 position of star is 09:30:25.8 +12:57:19
Equinox of date position of star is 09:31:48.8 +12:50:33
Star is 175 degrees from the moon. Moon is 79% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=16.9
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.8 per integration for unocculted signal
Expected flux drop is 98% with SNR of 13.5 for the occulted depth (per occulted point)
Apparent velocity is 28.4 km/sec on the sky relative to the star, or, 23.6 arcsec/hr.
Position angle of asteroid motion is 346.8 degrees
The recommended exposure time corresponds to 3.4 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 15.0 km.
The sky-plane scale is 4331.1 km/arcsec.
Diameter estimates:
38.7 km assuming a 5% albedo, aximum of 1.4 sec for a central chord
15.8 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 38.7 km used for deployment plan.
Star training set for 13385_98XO79, (2025/06/15 23:29UT) Object RA Dec mag sep mel Regulus 10:09:43.5 +11:50:31 1.3 9.31 170 5Xi Leo 09:33:18.9 +11:11:09 5.0 1.70 174 PPM 126520 09:31:46.6 +12:49:34 8.0 0.02 175 13385_98XO79 09:31:48.8 +12:50:33 16.9 175 Positions are for equinox of date
Star training set for 13385_98XO79, (2025/06/15 23:29UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 9.31 170 5Xi Leo 09:31:56.6 +11:17:57 5.0 1.70 174 PPM 126520 09:30:23.6 +12:56:20 8.0 0.02 175 13385_98XO79 09:30:25.8 +12:57:19 16.9 175 Positions are for J2000