Occultation event with (13060) 91EJ, event index number 980
Regions able to see the event: Australia
Geocentric closest approach at 2025/05/17 12:36:54 UTC
J2000 position of star is 08:52:23.8 +00:16:36
Equinox of date position of star is 08:53:42.0 +00:10:48
Star is 148 degrees from the moon. Moon is 79% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 5.0 per integration for unocculted signal
Expected flux drop is 75% with SNR of 3.7 for the occulted depth (per occulted point)
Apparent velocity is 17.4 km/sec on the sky relative to the star, or, 15.4 arcsec/hr.
Position angle of asteroid motion is 355.2 degrees
The recommended exposure time corresponds to 10.4 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 28.3 km.
The sky-plane scale is 4065.0 km/arcsec.
Diameter estimates:
41.7 km assuming a 5% albedo, aximum of 2.4 sec for a central chord
17.0 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 41.7 km used for deployment plan.
Star training set for 13060_91EJ, (2025/05/17 12:37UT) Object RA Dec mag sep mel Regulus 10:09:43.2 +11:50:32 1.3 22.18 141 Alphard 09:28:50.1 -08:46:11 2.0 12.52 136 PPM 177601 08:48:32.1 -01:59:30 5.3 2.53 147 PPM 177640 08:54:15.5 -00:15:19 8.2 0.46 147 PPM 155120 08:53:47.9 +00:05:12 9.2 0.10 148 13060_91EJ 08:53:42.0 +00:10:48 16.7 148 Positions are for equinox of date
Star training set for 13060_91EJ, (2025/05/17 12:37UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 22.18 141 Alphard 09:27:35.2 -08:39:30 2.0 12.52 136 PPM 177601 08:47:14.9 -01:53:49 5.3 2.53 147 PPM 177640 08:52:57.6 -00:09:30 8.2 0.46 147 PPM 155120 08:52:29.8 +00:11:00 9.2 0.10 148 13060_91EJ 08:52:23.8 +00:16:36 16.7 148 Positions are for J2000