Occultation event with (3451) Mentor, event index number 4798
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/11/21 08:17:07 UTC
J2000 position of star is 07:05:45.8 -05:10:34
Equinox of date position of star is 07:07:05.4 -05:13:08
Star is 95 degrees from the moon. Moon is 86% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=14.0
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 6.7 per integration for unocculted signal
Expected flux drop is 17% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 11.6 km/sec on the sky relative to the star, or, 11.9 arcsec/hr.
Position angle of asteroid motion is 48.6 degrees
The recommended exposure time corresponds to 23.3 km per image.
The 1-sigma error in the time of the event is 2.2 seconds.
The 1-sigma cross-track error in the shadow position is 27.7 km.
The sky-plane scale is 3536.4 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 10.5 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 4.3 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/11/21 08:17UT) Object RA Dec mag sep mel Sirius 06:46:20.0 -16:45:15 -1.5 12.61 92 2Bet CMa 06:23:53.1 -17:58:16 2.0 16.55 87 PPM 189831 07:03:15.6 -05:45:45 4.5 1.10 94 PPM 189918 07:07:51.3 -04:58:42 8.5 0.31 95 3451_Mentor 07:07:05.4 -05:13:08 14.0 95 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/11/21 08:17UT) Object RA Dec mag sep mel Sirius 06:45:07.9 -16:43:29 -1.5 12.61 92 2Bet CMa 06:22:42.0 -17:57:21 2.0 16.55 87 PPM 189831 07:01:56.3 -05:43:19 4.5 1.10 94 PPM 189918 07:06:31.6 -04:56:06 8.5 0.31 95 3451_Mentor 07:05:45.8 -05:10:34 14.0 95 Positions are for J2000