Occultation event with (13060) 91EJ, event index number 3138
Regions able to see the event: Australia
Geocentric closest approach at 2026/01/11 15:25:05 UTC
J2000 position of star is 10:58:18.8 -18:15:20
Equinox of date position of star is 10:59:35.8 -18:23:44
Star is 42 degrees from the moon. Moon is 41% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 84% with SNR of 8.4 for the occulted depth (per occulted point)
Apparent velocity is 12.0 km/sec on the sky relative to the star, or, 11.5 arcsec/hr.
Position angle of asteroid motion is 36.7 degrees
The recommended exposure time corresponds to 7.2 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 35.8 km.
The sky-plane scale is 3745.2 km/arcsec.
Diameter estimates:
41.9 km assuming a 5% albedo, maximum of 3.5 sec for a central chord
17.1 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 13060_91EJ, (2026/01/11 15:25UT) Object RA Dec mag sep mel Regulus 10:09:45.3 +11:50:20 1.3 32.64 63 4Gam Crv 12:17:08.9 -17:41:11 2.6 18.44 24 7Alp Crt 11:01:02.7 -18:26:16 4.1 0.35 42 PPM 223750 11:00:33.3 -17:45:48 8.0 0.67 42 PPM 223695 10:58:15.0 -18:21:40 9.0 0.32 42 13060_91EJ 10:59:35.8 -18:23:44 16.5 42 Positions are for equinox of date
Star training set for 13060_91EJ, (2026/01/11 15:25UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 32.64 63 4Gam Crv 12:15:48.1 -17:32:30 2.6 18.44 24 7Alp Crt 10:59:45.6 -18:17:52 4.1 0.35 42 PPM 223750 10:59:16.1 -17:37:24 8.0 0.67 42 PPM 223695 10:56:58.1 -18:13:18 9.0 0.32 42 13060_91EJ 10:58:18.8 -18:15:20 16.5 42 Positions are for J2000