Occultation event with (3451) Mentor, event index number 1585
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/11/25 06:38:59 UTC
J2000 position of star is 04:55:04.2 -05:52:01
Equinox of date position of star is 04:56:20.4 -05:49:37
Star is 125 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=15.3, apparent brightess of occulting body is G=13.6
Use an exposure time of 1.75 seconds with the standard RECON-QHY system.
SNR of 8.0 per integration for unocculted signal
Expected flux drop is 17% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 71.3 degrees
The recommended exposure time corresponds to 31.0 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 35.4 km.
The sky-plane scale is 3240.3 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, aximum of 6.9 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2025/11/25 06:39UT) Object RA Dec mag sep mel Rigel 05:15:47.0 -08:10:25 0.1 5.36 128 67Bet Eri 05:09:07.5 -05:03:18 2.8 3.27 128 61Ome Eri 04:54:10.1 -05:24:40 4.5 0.68 125 PPM 187475 04:56:50.0 -06:04:05 7.7 0.27 125 3451_Mentor 04:56:20.4 -05:49:37 13.6 125 Positions are for equinox of date
Star training set for 3451_Mentor, (2025/11/25 06:39UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 5.36 128 67Bet Eri 05:07:50.8 -05:05:13 2.8 3.27 128 61Ome Eri 04:52:53.7 -05:27:09 4.5 0.68 125 PPM 187475 04:55:33.9 -06:06:27 7.7 0.27 125 3451_Mentor 04:55:04.2 -05:52:01 13.6 125 Positions are for J2000