Occultation event with (9023) Mnesthus, event index number 4630
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/11/10 05:45:36 UTC
J2000 position of star is 04:16:37.6 -07:43:14
Equinox of date position of star is 04:17:55.8 -07:39:21
Star is 146 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.05 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 25% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 17.0 km/sec on the sky relative to the star, or, 19.3 arcsec/hr.
Position angle of asteroid motion is 65.7 degrees
The recommended exposure time corresponds to 17.8 km per image.
The 1-sigma error in the time of the event is 0.8 seconds.
The 1-sigma cross-track error in the shadow position is 22.3 km.
The sky-plane scale is 3165.6 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 49.2 km used for deployment plan.
Star training set for 9023_Mnesthus, (2026/11/10 05:46UT) Object RA Dec mag sep mel Rigel 05:15:49.8 -08:10:21 0.1 14.35 140 67Bet Eri 05:09:10.3 -05:03:13 2.8 12.99 143 PPM 186759 04:18:38.1 -06:24:28 6.4 1.26 148 PPM 186788 04:20:21.1 -07:21:35 8.1 0.67 147 PPM 186763 04:18:56.3 -07:34:47 9.2 0.26 146 9023_Mnesthus 04:17:55.8 -07:39:21 15.3 146 Positions are for equinox of date
Star training set for 9023_Mnesthus, (2026/11/10 05:46UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 14.35 140 67Bet Eri 05:07:50.8 -05:05:13 2.8 12.99 143 PPM 186759 04:17:19.2 -06:28:20 6.4 1.26 148 PPM 186788 04:19:02.7 -07:25:24 8.1 0.67 147 PPM 186763 04:17:38.1 -07:38:38 9.2 0.26 146 9023_Mnesthus 04:16:37.6 -07:43:14 15.3 146 Positions are for J2000