Occultation event with (13385) 98XO79, event index number 1191
Regions able to see the event: NMexico
Geocentric closest approach at 2025/05/04 04:19:14 UTC
J2000 position of star is 09:10:03.3 +13:30:17
Equinox of date position of star is 09:11:26.7 +13:24:02
Star is 9 degrees from the moon. Moon is 46% illuminated.
Stellar brightness G=17.0, apparent brightess of occulting body is G=16.8
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 46% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 11.2 km/sec on the sky relative to the star, or, 10.4 arcsec/hr.
Position angle of asteroid motion is 8.8 degrees
The recommended exposure time corresponds to 19.0 km per image.
The 1-sigma error in the time of the event is 4.8 seconds.
The 1-sigma cross-track error in the shadow position is 8.9 km.
The sky-plane scale is 3870.8 km/arcsec.
Diameter estimates:
38.7 km assuming a 5% albedo, aximum of 3.5 sec for a central chord
15.8 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 38.7 km used for deployment plan.
Star training set for 13385_98XO79, (2025/05/04 04:19UT) Object RA Dec mag sep mel Regulus 10:09:43.1 +11:50:33 1.3 14.30 21 PPM 126297 09:19:13.6 +11:23:37 6.4 2.76 12 PPM 126138 09:09:30.1 +13:56:20 8.4 0.72 9 PPM 126155 09:10:54.4 +13:15:10 8.6 0.20 9 13385_98XO79 09:11:26.7 +13:24:02 16.8 10 Positions are for equinox of date
Star training set for 13385_98XO79, (2025/05/04 04:19UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 14.30 21 PPM 126297 09:17:51.3 +11:30:04 6.4 2.76 12 PPM 126138 09:08:06.4 +14:02:32 8.4 0.72 9 PPM 126155 09:09:31.1 +13:21:25 8.6 0.20 9 13385_98XO79 09:10:03.3 +13:30:17 16.8 9 Positions are for J2000