Occultation event with (3451) Mentor, event index number 4469
Regions able to see the event: Senegal
Geocentric closest approach at 2026/10/24 05:19:50 UTC
J2000 position of star is 07:07:44.0 -03:21:31
Equinox of date position of star is 07:09:04.4 -03:24:09
Star is 103 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.2
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 4.5 per integration for unocculted signal
Expected flux drop is 13% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 12.2 km/sec on the sky relative to the star, or, 11.6 arcsec/hr.
Position angle of asteroid motion is 160.9 degrees
The recommended exposure time corresponds to 24.3 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 12.7 km.
The sky-plane scale is 3787.9 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 10.1 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 4.1 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/10/24 05:20UT) Object RA Dec mag sep mel Sirius 06:46:19.8 -16:45:15 -1.5 14.47 99 2Bet CMa 06:23:52.8 -17:58:16 2.0 18.30 93 20 Mon 07:11:33.6 -04:16:52 4.9 1.08 104 PPM 189946 07:09:07.4 -03:24:54 7.9 0.02 104 3451_Mentor 07:09:04.4 -03:24:09 14.2 104 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/10/24 05:20UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:29 -1.5 14.47 99 2Bet CMa 06:22:42.0 -17:57:21 2.0 18.30 93 20 Mon 07:10:13.7 -04:14:08 4.9 1.08 104 PPM 189946 07:07:47.0 -03:22:16 7.9 0.02 104 3451_Mentor 07:07:44.0 -03:21:31 14.2 103 Positions are for J2000