Occultation event with (3451) Mentor, event index number 4219
Regions able to see the event: Australia
Geocentric closest approach at 2026/09/10 19:08:22 UTC
J2000 position of star is 06:53:05.4 -00:12:54
Equinox of date position of star is 06:54:27.3 -00:14:59
Star is 61 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=14.4
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 14% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 26.6 km/sec on the sky relative to the star, or, 22.7 arcsec/hr.
Position angle of asteroid motion is 115.8 degrees
The recommended exposure time corresponds to 31.9 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 32.6 km.
The sky-plane scale is 4217.7 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 4.6 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/09/10 19:08UT) Object RA Dec mag sep mel Betelgeuse 05:56:37.1 +07:24:35 0.4 16.33 75 Alhena 06:39:15.2 +16:22:27 1.9 17.04 65 PPM 176522 06:55:46.0 -01:09:44 5.2 0.97 61 PPM 176491 06:53:32.3 -00:19:46 8.2 0.24 62 PPM 176503 06:54:27.0 -00:11:32 9.4 0.06 61 3451_Mentor 06:54:27.3 -00:14:59 14.4 61 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/09/10 19:08UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 16.33 75 Alhena 06:37:42.8 +16:23:56 1.9 17.04 65 PPM 176522 06:54:24.6 -01:07:37 5.2 0.97 61 PPM 176491 06:52:10.4 -00:17:44 8.2 0.24 62 PPM 176503 06:53:05.1 -00:09:28 9.4 0.06 61 3451_Mentor 06:53:05.4 -00:12:54 14.4 61 Positions are for J2000