Occultation event with (3391) Sinon, event index number 1015
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/05/29 23:55:22 UTC
J2000 position of star is 09:15:07.9 +19:53:20
Equinox of date position of star is 09:16:34.1 +19:46:55
Star is 27 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=13.1, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 10.1 per integration for unocculted signal
Expected flux drop is 93% with SNR of 9.4 for the occulted depth (per occulted point)
Apparent velocity is 25.0 km/sec on the sky relative to the star, or, 23.2 arcsec/hr.
The recommended exposure time corresponds to 3.0 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 33.1 km.
The sky-plane scale is 3884.6 km/arcsec.
Diameter estimates:
51.0 km assuming a 5% albedo, aximum of 2.0 sec for a central chord
20.8 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 51.0 km used for deployment plan.
Star training set for 3391_Sinon, (2025/05/29 23:55UT) Object RA Dec mag sep mel Regulus 10:09:43.4 +11:50:31 1.3 15.04 42 PPM 099404 09:15:04.1 +21:10:38 6.1 1.44 26 PPM 126263 09:17:16.5 +18:41:16 8.3 1.11 27 PPM 126268 09:17:30.2 +19:44:26 9.7 0.22 27 3391_Sinon 09:16:34.1 +19:46:55 16.0 27 Positions are for equinox of date
Star training set for 3391_Sinon, (2025/05/29 23:55UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 15.04 42 PPM 099404 09:13:37.2 +21:16:59 6.1 1.44 26 PPM 126263 09:15:50.8 +18:47:41 8.3 1.11 27 PPM 126268 09:16:04.1 +19:50:52 9.7 0.22 27 3391_Sinon 09:15:07.9 +19:53:20 16.0 27 Positions are for J2000