Occultation event with (31342) 98MU31, event index number 1464
Regions able to see the event: Australia
Geocentric closest approach at 2025/11/06 12:40:14 UTC
J2000 position of star is 03:35:30.5 -06:06:01
Equinox of date position of star is 03:36:47.0 -06:00:56
Star is 31 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.1 per integration for unocculted signal
Expected flux drop is 81% with SNR of 7.4 for the occulted depth (per occulted point)
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
Position angle of asteroid motion is 82.0 degrees
The recommended exposure time corresponds to 4.4 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 27.4 km.
The sky-plane scale is 3209.9 km/arcsec.
Diameter estimates:
49.0 km assuming a 5% albedo, aximum of 2.8 sec for a central chord
20.0 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 47.4 km used for deployment plan.
Star training set for 31342_98MU31, (2025/11/06 12:40UT) Object RA Dec mag sep mel Rigel 05:15:46.9 -08:10:25 0.1 24.65 40 Menkar 03:03:38.0 +04:11:22 2.5 13.14 22 21 Eri 03:40:17.8 -05:32:42 6.2 0.99 30 PPM 185927 03:35:32.3 -06:26:08 8.1 0.52 31 PPM 185968 03:37:20.7 -05:50:52 9.6 0.22 30 31342_98MU31 03:36:47.0 -06:00:56 15.5 30 Positions are for equinox of date
Star training set for 31342_98MU31, (2025/11/06 12:40UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 24.65 40 Menkar 03:02:16.8 +04:05:21 2.5 13.14 22 21 Eri 03:39:01.1 -05:37:40 6.2 0.99 30 PPM 185927 03:34:15.9 -06:31:14 8.1 0.52 31 PPM 185968 03:36:04.1 -05:55:56 9.6 0.22 30 31342_98MU31 03:35:30.5 -06:06:01 15.5 31 Positions are for J2000