Occultation event with (3451) Mentor, event index number 4014
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/15 08:37:51 UTC
J2000 position of star is 06:36:14.7 +01:18:21
Equinox of date position of star is 06:37:37.3 +01:16:55
Star is 77 degrees from the moon. Moon is 9% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=14.4
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 12% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 34.3 km/sec on the sky relative to the star, or, 27.9 arcsec/hr.
Position angle of asteroid motion is 105.0 degrees
The recommended exposure time corresponds to 58.4 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 4431.5 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2026/08/15 08:38UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.8 +07:24:35 0.4 11.91 87 Alhena 06:39:15.0 +16:22:27 1.9 15.10 77 PPM 150810 06:36:38.2 +00:52:02 5.7 0.48 77 PPM 150853 06:37:58.6 +01:01:47 7.6 0.27 77 3451_Mentor 06:37:37.3 +01:16:55 14.4 77 Positions are for equinox of date
Star training set for 3451_Mentor, (2026/08/15 08:38UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 11.91 87 Alhena 06:37:42.8 +16:23:56 1.9 15.10 77 PPM 150810 06:35:15.8 +00:53:25 5.7 0.48 77 PPM 150853 06:36:36.1 +01:03:14 7.6 0.27 77 3451_Mentor 06:36:14.7 +01:18:21 14.4 77 Positions are for J2000