Occultation event with (3391) Sinon, event index number 5041
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/05 06:47:57 UTC
J2000 position of star is 13:00:33.2 -13:51:17
Equinox of date position of star is 13:01:58.3 -13:59:58
Star is 12 degrees from the moon. Moon is 13% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 53% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 30.5 km/sec on the sky relative to the star, or, 25.6 arcsec/hr.
Position angle of asteroid motion is 123.2 degrees
The recommended exposure time corresponds to 18.3 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 15.6 km.
The sky-plane scale is 4276.4 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 37.9 km used for deployment plan.
Star training set for 3391_Sinon, (2026/12/05 06:48UT) Object RA Dec mag sep mel Spica 13:26:36.9 -11:18:04 1.0 6.59 8 PPM 226546 12:57:18.4 -15:28:20 6.2 1.86 13 PPM 226652 13:01:50.4 -14:02:12 7.9 0.05 12 3391_Sinon 13:01:58.3 -13:59:58 16.2 12 Positions are for equinox of date
Star training set for 3391_Sinon, (2026/12/05 06:48UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 6.59 8 PPM 226546 12:55:53.2 -15:19:37 6.2 1.86 13 PPM 226652 13:00:25.3 -13:53:32 7.9 0.05 12 3391_Sinon 13:00:33.2 -13:51:17 16.2 12 Positions are for J2000