Occultation event with (3391) Sinon, event index number 3816
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/06/30 19:13:28 UTC
J2000 position of star is 11:09:17.1 +00:44:35
Equinox of date position of star is 11:10:38.6 +00:35:56
Star is 119 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=11.9, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 23.0 per integration for unocculted signal
Expected flux drop is 98% with SNR of 22.6 for the occulted depth (per occulted point)
Apparent velocity is 22.8 km/sec on the sky relative to the star, or, 20.4 arcsec/hr.
Position angle of asteroid motion is 116.1 degrees
The recommended exposure time corresponds to 2.7 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 17.3 km.
The sky-plane scale is 4023.4 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 37.9 km used for deployment plan.
Star training set for 3391_Sinon, (2026/06/30 19:13UT) Object RA Dec mag sep mel Regulus 10:09:46.8 +11:50:12 1.3 18.82 138 Denebola 11:50:24.6 +14:25:26 2.1 16.96 116 69 Leo 11:15:06.9 -00:12:51 5.3 1.38 118 PPM 157506 11:07:23.9 +01:04:01 7.9 0.94 120 PPM 157608 11:13:03.5 +00:29:22 10.0 0.61 119 PPM 157541 11:09:21.7 +00:33:55 11.3 0.32 120 3391_Sinon 11:10:38.6 +00:35:56 16.1 119 Positions are for equinox of date
Star training set for 3391_Sinon, (2026/06/30 19:13UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 18.82 138 Denebola 11:49:02.7 +14:34:16 2.1 16.96 116 69 Leo 11:13:45.5 -00:04:10 5.3 1.38 118 PPM 157506 11:06:02.2 +01:12:38 7.9 0.94 120 PPM 157608 11:11:42.0 +00:38:02 10.0 0.61 119 PPM 157541 11:08:00.1 +00:42:33 11.3 0.32 120 3391_Sinon 11:09:17.1 +00:44:35 16.1 119 Positions are for J2000