Occultation event with (3451) Mentor, event index number 1209
Regions able to see the event: Australia
Geocentric closest approach at 2025/08/05 20:38:40 UTC
J2000 position of star is 04:48:47.0 +01:56:07
Equinox of date position of star is 04:50:06.8 +01:58:43
Star is 147 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.3
Use an exposure time of 1.10 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 15% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 27.9 km/sec on the sky relative to the star, or, 24.5 arcsec/hr.
Position angle of asteroid motion is 105.5 degrees
The recommended exposure time corresponds to 30.7 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 34.2 km.
The sky-plane scale is 4100.2 km/arcsec.
Diameter estimates:
122.5 km assuming a 5% albedo, aximum of 4.4 sec for a central chord
50.0 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 126.3 km used for deployment plan.
Star training set for 3451_Mentor, (2025/08/05 20:39UT) Object RA Dec mag sep mel Rigel 05:15:46.1 -08:10:26 0.1 12.00 141 67Bet Eri 05:09:06.6 -05:03:19 2.8 8.48 143 8Pi 5Ori 04:55:35.2 +02:28:50 3.7 1.46 149 PPM 148018 04:50:53.2 +02:14:40 7.6 0.33 148 PPM 147979 04:49:19.1 +01:56:58 9.7 0.20 147 3451_Mentor 04:50:06.8 +01:58:43 14.3 148 Positions are for equinox of date
Star training set for 3451_Mentor, (2025/08/05 20:39UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 12.00 141 67Bet Eri 05:07:50.8 -05:05:13 2.8 8.48 143 8Pi 5Ori 04:54:15.1 +02:26:26 3.7 1.46 149 PPM 148018 04:49:33.3 +02:12:07 7.6 0.33 148 PPM 147979 04:47:59.3 +01:54:21 9.7 0.20 147 3451_Mentor 04:48:47.0 +01:56:07 14.3 147 Positions are for J2000