Occultation event with (3391) Sinon, event index number 1113
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/06 09:52:22 UTC
J2000 position of star is 09:41:00.3 +16:47:49
Equinox of date position of star is 09:42:24.6 +16:40:48
Star is 92 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
SNR of 10.0 per integration for unocculted signal
Expected flux drop is 86% with SNR of 8.6 for the occulted depth (per occulted point)
Apparent velocity is 36.5 km/sec on the sky relative to the star, or, 31.1 arcsec/hr.
Position angle of asteroid motion is 334.3 degrees
The recommended exposure time corresponds to 11.0 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.1 km.
The sky-plane scale is 4226.1 km/arcsec.
Diameter estimates:
51.0 km assuming a 5% albedo, aximum of 1.4 sec for a central chord
20.8 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 51.0 km used for deployment plan.
Star training set for 3391_Sinon, (2025/07/06 09:52UT) Object RA Dec mag sep mel Regulus 10:09:43.7 +11:50:30 1.3 8.20 84 16Psi Leo 09:45:07.1 +13:54:14 5.3 2.85 90 PPM 126714 09:43:43.1 +16:57:53 7.9 0.42 92 PPM 126684 09:41:49.0 +16:51:05 9.1 0.22 92 3391_Sinon 09:42:24.6 +16:40:48 16.0 92 Positions are for equinox of date
Star training set for 3391_Sinon, (2025/07/06 09:52UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 8.20 84 16Psi Leo 09:43:43.9 +14:01:18 5.3 2.85 90 PPM 126714 09:42:18.8 +17:04:55 7.9 0.42 92 PPM 126684 09:40:24.7 +16:58:05 9.1 0.22 92 3391_Sinon 09:41:00.3 +16:47:49 16.0 92 Positions are for J2000