Occultation event with (9023) Mnesthus, event index number 4393
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/10/14 06:58:07 UTC
J2000 position of star is 04:26:22.4 -05:50:46
Equinox of date position of star is 04:27:41.4 -05:47:14
Star is 148 degrees from the moon. Moon is 13% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=15.5
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 28% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 14.7 arcsec/hr.
Position angle of asteroid motion is 34.3 degrees
The recommended exposure time corresponds to 15.4 km per image.
The 1-sigma error in the time of the event is 1.8 seconds.
The 1-sigma cross-track error in the shadow position is 11.7 km.
The sky-plane scale is 3278.7 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 49.2 km used for deployment plan.
Star training set for 9023_Mnesthus, (2026/10/14 06:58UT) Object RA Dec mag sep mel Rigel 05:15:49.6 -08:10:22 0.1 12.18 141 67Bet Eri 05:09:10.1 -05:03:14 2.8 10.35 145 PPM 186813 04:21:57.6 -06:11:03 6.5 1.48 148 PPM 186947 04:28:39.7 -05:47:09 8.1 0.24 148 PPM 186942 04:28:25.4 -05:53:50 9.4 0.21 148 9023_Mnesthus 04:27:41.4 -05:47:14 15.5 148 Positions are for equinox of date
Star training set for 9023_Mnesthus, (2026/10/14 06:58UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 12.18 141 67Bet Eri 05:07:50.8 -05:05:13 2.8 10.35 145 PPM 186813 04:20:38.8 -06:14:47 6.5 1.48 148 PPM 186947 04:27:20.7 -05:50:38 8.1 0.24 148 PPM 186942 04:27:06.5 -05:57:20 9.4 0.21 148 9023_Mnesthus 04:26:22.4 -05:50:46 15.5 148 Positions are for J2000