Occultation event with (3451) Mentor, event index number 4369
Regions able to see the event: Japan
Geocentric closest approach at 2026/10/09 16:23:18 UTC
J2000 position of star is 07:05:01.9 -02:16:44
Equinox of date position of star is 07:06:22.8 -02:19:15
Star is 77 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.90 seconds with the standard RECON-QHY system.
SNR of 5.1 per integration for unocculted signal
Expected flux drop is 16% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 16.5 km/sec on the sky relative to the star, or, 15.1 arcsec/hr.
Position angle of asteroid motion is 138.1 degrees
The recommended exposure time corresponds to 31.3 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 25.0 km.
The sky-plane scale is 3934.4 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 7.4 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 3.0 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/10/09 16:23UT) Object RA Dec mag sep mel Sirius 06:46:19.7 -16:45:15 -1.5 15.25 81 2Bet CMa 06:23:52.7 -17:58:16 2.0 18.80 86 19 Mon 07:04:14.5 -04:16:48 5.0 2.03 77 PPM 176640 07:04:58.0 -02:30:56 7.3 0.40 77 PPM 176659 07:06:51.3 -02:15:01 9.3 0.14 76 3451_Mentor 07:06:22.8 -02:19:15 14.3 76 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/10/09 16:23UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:29 -1.5 15.25 81 2Bet CMa 06:22:42.0 -17:57:21 2.0 18.80 86 19 Mon 07:02:54.8 -04:14:21 5.0 2.03 77 PPM 176640 07:03:37.2 -02:28:28 7.3 0.40 77 PPM 176659 07:05:30.3 -02:12:28 9.3 0.14 76 3451_Mentor 07:05:01.9 -02:16:44 14.3 77 Positions are for J2000