Occultation event with (3391) Sinon, event index number 3593
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/07 16:12:20 UTC
J2000 position of star is 11:03:18.8 +02:22:16
Equinox of date position of star is 11:04:39.9 +02:13:45
Star is 94 degrees from the moon. Moon is 73% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=15.4
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 25% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 13.2 km/sec on the sky relative to the star, or, 15.1 arcsec/hr.
Position angle of asteroid motion is 102.0 degrees
The recommended exposure time corresponds to 15.8 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 26.3 km.
The sky-plane scale is 3152.4 km/arcsec.
Diameter estimates:
51.5 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
21.0 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 37.9 km used for deployment plan.
Star training set for 3391_Sinon, (2026/04/07 16:12UT) Object RA Dec mag sep mel Regulus 10:09:46.1 +11:50:16 1.3 16.65 110 Denebola 11:50:23.9 +14:25:31 2.1 16.62 90 58 Leo 11:01:55.0 +03:28:33 4.8 1.42 95 PPM 157447 11:03:38.9 +02:02:52 7.8 0.31 94 3391_Sinon 11:04:39.9 +02:13:45 15.4 93 Positions are for equinox of date
Star training set for 3391_Sinon, (2026/04/07 16:12UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 16.65 110 Denebola 11:49:02.7 +14:34:16 2.1 16.62 90 58 Leo 11:00:33.7 +03:37:02 4.8 1.42 95 PPM 157447 11:02:17.8 +02:11:22 7.8 0.31 94 3391_Sinon 11:03:18.8 +02:22:16 15.4 94 Positions are for J2000