Occultation event with (11397) 98XX93, event index number 3680
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/24 13:19:36 UTC
J2000 position of star is 12:57:37.3 -29:02:56
Equinox of date position of star is 12:59:03.2 -29:11:26
Star is 77 degrees from the moon. Moon is 55% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 30% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 19.0 arcsec/hr.
Position angle of asteroid motion is 127.3 degrees
The recommended exposure time corresponds to 15.9 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 22.9 km.
The sky-plane scale is 3348.7 km/arcsec.
Diameter estimates:
54.5 km assuming a 5% albedo, maximum of 3.1 sec for a central chord
22.2 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 45.4 km used for deployment plan.
Star training set for 11397_98XX93, (2026/04/24 13:20UT) Object RA Dec mag sep mel Spica 13:26:35.0 -11:17:52 1.0 19.01 74 9Bet Crv 12:35:46.5 -23:32:31 2.6 7.68 69 PPM 260814 12:49:50.8 -27:44:27 5.6 2.49 74 PPM 260948 12:55:18.8 -29:27:00 7.8 0.86 76 PPM 261064 13:00:09.9 -29:08:17 9.9 0.25 77 11397_98XX93 12:59:03.2 -29:11:26 15.4 77 Positions are for equinox of date
Star training set for 11397_98XX93, (2026/04/24 13:20UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 19.01 74 9Bet Crv 12:34:23.2 -23:23:50 2.6 7.68 69 PPM 260814 12:48:26.0 -27:35:52 5.6 2.49 74 PPM 260948 12:53:53.2 -29:18:28 7.8 0.86 76 PPM 261064 12:58:44.0 -28:59:47 9.9 0.25 77 11397_98XX93 12:57:37.3 -29:02:56 15.4 77 Positions are for J2000