Occultation event with (9023) Mnesthus, event index number 3943
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/05 19:25:52 UTC
J2000 position of star is 04:12:30.8 -00:56:01
Equinox of date position of star is 04:13:52.0 -00:52:02
Star is 34 degrees from the moon. Moon is 53% illuminated.
Stellar brightness G=10.7, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 41.9 per integration for unocculted signal
Expected flux drop is 99% with SNR of 41.6 for the occulted depth (per occulted point)
Apparent velocity is 24.2 km/sec on the sky relative to the star, or, 22.3 arcsec/hr.
Position angle of asteroid motion is 106.6 degrees
The recommended exposure time corresponds to 2.9 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 25.8 km.
The sky-plane scale is 3908.1 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, maximum of 2.2 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 49.2 km used for deployment plan.
Star training set for 9023_Mnesthus, (2026/08/05 19:26UT) Object RA Dec mag sep mel Rigel 05:15:49.0 -08:10:22 0.1 17.07 51 67Bet Eri 05:09:09.5 -05:03:15 2.8 14.42 47 PPM 175468 04:14:59.3 -01:05:02 6.1 0.35 34 9023_Mnesthus 04:13:52.0 -00:52:02 16.0 34 Positions are for equinox of date
Star training set for 9023_Mnesthus, (2026/08/05 19:26UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 17.07 51 67Bet Eri 05:07:50.8 -05:05:13 2.8 14.42 47 PPM 175468 04:13:38.1 -01:08:59 6.1 0.35 34 9023_Mnesthus 04:12:30.8 -00:56:01 16.0 34 Positions are for J2000