Occultation event with (3451) Mentor, event index number 1419
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/26 15:46:55 UTC
J2000 position of star is 05:06:53.7 -03:59:55
Equinox of date position of star is 05:08:10.8 -03:57:57
Star is 145 degrees from the moon. Moon is 22% illuminated.
Stellar brightness G=16.4, apparent brightess of occulting body is G=13.8
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.4 per integration for unocculted signal
Expected flux drop is 8% with SNR of 0.3 for the occulted depth (per occulted point)
Apparent velocity is 14.3 km/sec on the sky relative to the star, or, 15.3 arcsec/hr.
Position angle of asteroid motion is 39.5 degrees
The recommended exposure time corresponds to 28.6 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 22.6 km.
The sky-plane scale is 3352.6 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, aximum of 8.6 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 3.5 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2025/10/26 15:47UT) Object RA Dec mag sep mel Rigel 05:15:46.8 -08:10:25 0.1 4.61 142 67Bet Eri 05:09:07.2 -05:03:18 2.8 1.11 144 66 Eri 05:08:02.3 -04:37:21 5.0 0.66 145 PPM 187740 05:09:41.7 -03:48:29 7.9 0.41 146 PPM 187713 05:08:01.3 -04:12:52 9.0 0.25 145 3451_Mentor 05:08:10.8 -03:57:57 13.8 145 Positions are for equinox of date
Star training set for 3451_Mentor, (2025/10/26 15:47UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 4.61 142 67Bet Eri 05:07:50.8 -05:05:13 2.8 1.11 144 66 Eri 05:06:45.6 -04:39:19 5.0 0.66 145 PPM 187740 05:08:24.6 -03:50:23 7.9 0.41 146 PPM 187713 05:06:44.4 -04:14:50 9.0 0.25 145 3451_Mentor 05:06:53.7 -03:59:55 13.8 145 Positions are for J2000