Occultation event with (3451) Mentor, event index number 4184
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/05 10:30:30 UTC
J2000 position of star is 06:50:03.7 +00:07:46
Equinox of date position of star is 06:51:25.8 +00:05:49
Star is 32 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=13.3, apparent brightess of occulting body is G=14.4
Use an exposure time of 0.15 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 73% with SNR of 7.0 for the occulted depth (per occulted point)
Apparent velocity is 28.3 km/sec on the sky relative to the star, or, 23.9 arcsec/hr.
Position angle of asteroid motion is 113.2 degrees
The recommended exposure time corresponds to 4.2 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 34.4 km.
The sky-plane scale is 4265.7 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 4.3 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/09/05 10:31UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.0 +07:24:35 0.4 15.50 21 Alhena 06:39:15.2 +16:22:27 1.9 16.55 16 PPM 151313 06:50:26.3 +00:58:12 5.9 0.91 31 PPM 151351 06:51:35.4 +00:06:16 8.5 0.04 32 3451_Mentor 06:51:25.8 +00:05:49 14.4 32 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/09/05 10:31UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 15.50 21 Alhena 06:37:42.8 +16:23:56 1.9 16.55 16 PPM 151313 06:49:03.7 +01:00:07 5.9 0.91 31 PPM 151351 06:50:13.3 +00:08:14 8.5 0.04 32 3451_Mentor 06:50:03.7 +00:07:46 14.4 32 Positions are for J2000