Occultation event with (13060) 91EJ, event index number 3281
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/02/21 07:31:04 UTC
J2000 position of star is 10:42:36.5 -19:17:36
Equinox of date position of star is 10:43:52.8 -19:25:51
Star is 143 degrees from the moon. Moon is 17% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 6.4 per integration for unocculted signal
Expected flux drop is 74% with SNR of 4.7 for the occulted depth (per occulted point)
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 96.3 degrees
The recommended exposure time corresponds to 8.9 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 30.1 km.
The sky-plane scale is 3482.6 km/arcsec.
Diameter estimates:
41.9 km assuming a 5% albedo, maximum of 2.4 sec for a central chord
17.1 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 36.1 km used for deployment plan.
Star training set for 13060_91EJ, (2026/02/21 07:31UT) Object RA Dec mag sep mel Regulus 10:09:45.7 +11:50:18 1.3 32.38 129 Alphard 09:28:52.3 -08:46:23 2.0 21.05 125 PPM 223444 10:48:09.1 -17:26:08 5.7 2.24 145 PPM 223386 10:45:37.7 -19:16:47 8.3 0.44 144 PPM 223347 10:44:12.1 -19:24:39 9.7 0.08 144 13060_91EJ 10:43:52.8 -19:25:51 16.2 144 Positions are for equinox of date
Star training set for 13060_91EJ, (2026/02/21 07:31UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 32.38 129 Alphard 09:27:35.2 -08:39:30 2.0 21.05 125 PPM 223444 10:46:52.1 -17:17:50 5.7 2.24 145 PPM 223386 10:44:21.2 -19:08:31 8.3 0.44 144 PPM 223347 10:42:55.7 -19:16:24 9.7 0.08 144 13060_91EJ 10:42:36.5 -19:17:36 16.2 143 Positions are for J2000