Occultation event with (3391) Sinon, event index number 3777
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/06/02 17:16:44 UTC
J2000 position of star is 10:58:51.8 +02:04:26
Equinox of date position of star is 11:00:13.3 +01:55:55
Star is 112 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 7.3 per integration for unocculted signal
Expected flux drop is 64% with SNR of 4.7 for the occulted depth (per occulted point)
Apparent velocity is 10.6 km/sec on the sky relative to the star, or, 10.3 arcsec/hr.
Position angle of asteroid motion is 119.6 degrees
The recommended exposure time corresponds to 9.0 km per image.
The 1-sigma error in the time of the event is 3.5 seconds.
The 1-sigma cross-track error in the shadow position is 15.3 km.
The sky-plane scale is 3701.4 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, maximum of 4.8 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 2.0 sec for a central chord
Cross-track diameter of 37.9 km used for deployment plan.
Star training set for 3391_Sinon, (2026/06/02 17:17UT) Object RA Dec mag sep mel Regulus 10:09:46.6 +11:50:13 1.3 15.95 128 55 Leo 10:57:03.9 +00:35:44 6.2 1.55 112 PPM 157393 11:00:09.2 +01:35:13 8.4 0.35 112 PPM 157394 11:00:21.4 +02:03:10 9.5 0.13 112 3391_Sinon 11:00:13.3 +01:55:55 16.0 112 Positions are for equinox of date
Star training set for 3391_Sinon, (2026/06/02 17:17UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.95 128 55 Leo 10:55:42.5 +00:44:13 6.2 1.55 112 PPM 157393 10:58:47.6 +01:43:44 8.4 0.35 112 PPM 157394 10:58:59.9 +02:11:41 9.5 0.13 112 3391_Sinon 10:58:51.8 +02:04:26 16.0 112 Positions are for J2000