Occultation event with (3451) Mentor, event index number 1498
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/12 16:18:11 UTC
J2000 position of star is 05:00:57.5 -05:12:33
Equinox of date position of star is 05:02:14.0 -05:10:22
Star is 76 degrees from the moon. Moon is 45% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=13.7
Use an exposure time of 1.85 seconds with the standard RECON-QHY system.
SNR of 8.8 per integration for unocculted signal
Expected flux drop is 19% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 18.4 arcsec/hr.
Position angle of asteroid motion is 59.9 degrees
The recommended exposure time corresponds to 30.9 km per image.
The 1-sigma error in the time of the event is 1.1 seconds.
The 1-sigma cross-track error in the shadow position is 31.0 km.
The sky-plane scale is 3268.6 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, aximum of 7.3 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 3.0 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2025/11/12 16:18UT) Object RA Dec mag sep mel Rigel 05:15:46.9 -08:10:25 0.1 4.51 73 67Bet Eri 05:09:07.4 -05:03:18 2.8 1.72 74 PPM 187577 05:02:06.1 -05:43:30 6.3 0.55 76 PPM 187613 05:03:17.3 -05:27:57 7.0 0.39 75 PPM 187563 05:01:32.6 -05:10:11 9.3 0.17 76 3451_Mentor 05:02:14.0 -05:10:22 13.7 75 Positions are for equinox of date
Star training set for 3451_Mentor, (2025/11/12 16:18UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 4.51 73 67Bet Eri 05:07:50.8 -05:05:13 2.8 1.72 74 PPM 187577 05:00:49.9 -05:45:41 6.3 0.55 76 PPM 187613 05:02:01.0 -05:30:05 7.0 0.39 75 PPM 187563 05:00:16.0 -05:12:23 9.3 0.17 76 3451_Mentor 05:00:57.5 -05:12:33 13.7 76 Positions are for J2000