Occultation event with (11396) 98XZ77, event index number 3778
Regions able to see the event: Australia
Geocentric closest approach at 2026/06/04 11:37:41 UTC
J2000 position of star is 11:16:55.6 +00:48:44
Equinox of date position of star is 11:18:16.9 +00:40:03
Star is 129 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 6.8 per integration for unocculted signal
Expected flux drop is 70% with SNR of 4.8 for the occulted depth (per occulted point)
Apparent velocity is 9.4 km/sec on the sky relative to the star, or, 8.7 arcsec/hr.
Position angle of asteroid motion is 86.3 degrees
The recommended exposure time corresponds to 8.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 39.5 km.
The sky-plane scale is 3870.5 km/arcsec.
Diameter estimates:
44.9 km assuming a 5% albedo, maximum of 4.8 sec for a central chord
18.3 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 37.1 km used for deployment plan.
Star training set for 11396_98XZ77, (2026/06/04 11:38UT) Object RA Dec mag sep mel Regulus 10:09:46.6 +11:50:13 1.3 20.34 149 Denebola 11:50:24.4 +14:25:27 2.1 15.88 127 69 Leo 11:15:06.7 -00:12:49 5.3 1.19 129 PPM 157728 11:20:36.7 +00:34:42 7.8 0.59 128 PPM 157702 11:19:08.2 +00:38:46 9.4 0.21 129 11396_98XZ77 11:18:16.9 +00:40:03 16.5 128 Positions are for equinox of date
Star training set for 11396_98XZ77, (2026/06/04 11:38UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 20.34 149 Denebola 11:49:02.7 +14:34:16 2.1 15.88 127 69 Leo 11:13:45.5 -00:04:10 5.3 1.19 129 PPM 157728 11:19:15.4 +00:43:24 7.8 0.59 128 PPM 157702 11:17:46.9 +00:47:26 9.4 0.21 129 11396_98XZ77 11:16:55.6 +00:48:44 16.5 129 Positions are for J2000