Occultation event with (3451) Mentor, event index number 1535
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/18 05:25:53 UTC
J2000 position of star is 04:58:28.9 -05:31:45
Equinox of date position of star is 04:59:45.3 -05:29:29
Star is 131 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=13.6
Use an exposure time of 1.80 seconds with the standard RECON-QHY system.
SNR of 5.9 per integration for unocculted signal
Expected flux drop is 13% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 17.3 km/sec on the sky relative to the star, or, 19.1 arcsec/hr.
Position angle of asteroid motion is 65.2 degrees
The recommended exposure time corresponds to 31.1 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 32.5 km.
The sky-plane scale is 3252.3 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, aximum of 7.1 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2025/11/18 05:26UT) Object RA Dec mag sep mel Rigel 05:15:47.0 -08:10:25 0.1 4.80 126 67Bet Eri 05:09:07.4 -05:03:18 2.8 2.37 129 PPM 187577 05:02:06.1 -05:43:30 6.3 0.63 130 PPM 187521 04:59:10.4 -06:03:51 7.4 0.59 131 PPM 187522 04:59:11.8 -05:20:26 8.8 0.21 131 3451_Mentor 04:59:45.3 -05:29:29 13.6 131 Positions are for equinox of date
Star training set for 3451_Mentor, (2025/11/18 05:26UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 4.80 126 67Bet Eri 05:07:50.8 -05:05:13 2.8 2.37 129 PPM 187577 05:00:49.9 -05:45:41 6.3 0.63 130 PPM 187521 04:57:54.3 -06:06:09 7.4 0.59 131 PPM 187522 04:57:55.3 -05:22:44 8.8 0.21 131 3451_Mentor 04:58:28.9 -05:31:45 13.6 131 Positions are for J2000