Occultation event with (3451) Mentor, event index number 1717
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/12/24 06:07:37 UTC
J2000 position of star is 04:40:34.0 -06:18:10
Equinox of date position of star is 04:41:50.3 -06:15:14
Star is 105 degrees from the moon. Moon is 16% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=13.7
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 5.3 per integration for unocculted signal
Expected flux drop is 12% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 15.5 km/sec on the sky relative to the star, or, 16.9 arcsec/hr.
Position angle of asteroid motion is 96.5 degrees
The recommended exposure time corresponds to 31.0 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 35.9 km.
The sky-plane scale is 3295.9 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, aximum of 7.9 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 3.2 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2025/12/24 06:08UT) Object RA Dec mag sep mel Rigel 05:15:47.3 -08:10:25 0.1 8.64 112 67Bet Eri 05:09:07.7 -05:03:17 2.8 6.89 111 PPM 187086 04:35:30.2 -06:47:08 6.4 1.66 103 PPM 187205 04:42:21.0 -06:41:57 7.4 0.46 104 PPM 187211 04:42:34.8 -06:28:33 9.2 0.29 105 3451_Mentor 04:41:50.3 -06:15:14 13.7 105 Positions are for equinox of date
Star training set for 3451_Mentor, (2025/12/24 06:08UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 8.64 112 67Bet Eri 05:07:50.8 -05:05:13 2.8 6.89 111 PPM 187086 04:34:14.2 -06:50:17 6.4 1.66 103 PPM 187205 04:41:05.0 -06:44:51 7.4 0.46 104 PPM 187211 04:41:18.6 -06:31:27 9.2 0.29 105 3451_Mentor 04:40:34.0 -06:18:10 13.7 105 Positions are for J2000