Occultation event with (3451) Mentor, event index number 4406
Regions able to see the event: SAmericaN,SAmericaS,SMexico
Geocentric closest approach at 2026/10/15 07:53:10 UTC
J2000 position of star is 07:06:22.2 -02:42:03
Equinox of date position of star is 07:07:43.0 -02:44:38
Star is 136 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.40 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 32% with SNR of 3.1 for the occulted depth (per occulted point)
Apparent velocity is 14.6 km/sec on the sky relative to the star, or, 13.6 arcsec/hr.
Position angle of asteroid motion is 145.5 degrees
The recommended exposure time corresponds to 20.5 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 21.7 km.
The sky-plane scale is 3877.1 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 8.4 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 3.4 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/10/15 07:53UT) Object RA Dec mag sep mel Sirius 06:46:19.7 -16:45:15 -1.5 14.96 128 2Bet CMa 06:23:52.8 -17:58:16 2.0 18.64 130 19 Mon 07:04:14.6 -04:16:48 5.0 1.76 136 PPM 189924 07:08:11.1 -02:47:29 8.5 0.13 136 3451_Mentor 07:07:43.0 -02:44:38 14.3 136 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/10/15 07:53UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:29 -1.5 14.96 128 2Bet CMa 06:22:42.0 -17:57:21 2.0 18.64 130 19 Mon 07:02:54.8 -04:14:21 5.0 1.76 136 PPM 189924 07:06:50.4 -02:44:53 8.5 0.13 136 3451_Mentor 07:06:22.2 -02:42:03 14.3 136 Positions are for J2000