Occultation event with (3391) Sinon, event index number 1536
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/18 07:27:33 UTC
J2000 position of star is 11:25:06.6 +03:57:15
Equinox of date position of star is 11:26:26.5 +03:48:42
Star is 45 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 4.7 per integration for unocculted signal
Expected flux drop is 70% with SNR of 3.3 for the occulted depth (per occulted point)
Apparent velocity is 24.9 km/sec on the sky relative to the star, or, 22.6 arcsec/hr.
Position angle of asteroid motion is 120.8 degrees
The recommended exposure time corresponds to 8.7 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 14.1 km.
The sky-plane scale is 3968.6 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, aximum of 2.1 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 37.9 km used for deployment plan.
Star training set for 3391_Sinon, (2025/11/18 07:28UT) Object RA Dec mag sep mel Regulus 10:09:44.9 +11:50:23 1.3 20.61 65 Denebola 11:50:22.7 +14:25:38 2.1 12.14 46 80 Leo 11:27:09.9 +03:43:03 6.5 0.20 44 PPM 157848 11:27:09.5 +03:51:38 9.7 0.19 44 3391_Sinon 11:26:26.5 +03:48:42 16.0 44 Positions are for equinox of date
Star training set for 3391_Sinon, (2025/11/18 07:28UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 20.61 65 Denebola 11:49:02.7 +14:34:16 2.1 12.14 46 80 Leo 11:25:49.9 +03:51:36 6.5 0.20 44 PPM 157848 11:25:49.5 +04:00:11 9.7 0.19 44 3391_Sinon 11:25:06.6 +03:57:15 16.0 45 Positions are for J2000