Occultation event with (13060) 91EJ, event index number 3715
Regions able to see the event: Europe,SAfrica
Geocentric closest approach at 2026/05/04 18:51:54 UTC
J2000 position of star is 10:17:59.7 -15:27:59
Equinox of date position of star is 10:19:16.5 -15:35:56
Star is 93 degrees from the moon. Moon is 91% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=16.6
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 9.4 per integration for unocculted signal
Expected flux drop is 90% with SNR of 8.5 for the occulted depth (per occulted point)
Apparent velocity is 8.8 km/sec on the sky relative to the star, or, 8.4 arcsec/hr.
Position angle of asteroid motion is 3.6 degrees
The recommended exposure time corresponds to 2.7 km per image.
The 1-sigma error in the time of the event is 3.3 seconds.
The 1-sigma cross-track error in the shadow position is 22.9 km.
The sky-plane scale is 3767.3 km/arcsec.
Diameter estimates:
41.9 km assuming a 5% albedo, maximum of 4.7 sec for a central chord
17.1 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 13060_91EJ, (2026/05/04 18:52UT) Object RA Dec mag sep mel Regulus 10:09:46.3 +11:50:15 1.3 27.54 108 Alphard 09:28:52.9 -08:46:27 2.0 14.07 107 42Mu Hya 10:27:22.0 -16:58:18 3.8 2.38 91 PPM 222824 10:22:06.5 -15:36:40 7.5 0.68 92 PPM 222746 10:19:21.3 -15:45:13 9.5 0.16 93 13060_91EJ 10:19:16.5 -15:35:56 16.6 93 Positions are for equinox of date
Star training set for 13060_91EJ, (2026/05/04 18:52UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 27.54 108 Alphard 09:27:35.2 -08:39:30 2.0 14.07 107 42Mu Hya 10:26:05.2 -16:50:13 3.8 2.38 91 PPM 222824 10:20:49.6 -15:28:40 7.5 0.68 92 PPM 222746 10:18:04.5 -15:37:16 9.5 0.16 93 13060_91EJ 10:17:59.7 -15:27:59 16.6 93 Positions are for J2000