Occultation event with (9023) Mnesthus, event index number 4519
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/10/30 00:36:48 UTC
J2000 position of star is 04:21:29.8 -07:02:09
Equinox of date position of star is 04:22:48.3 -06:58:26
Star is 42 degrees from the moon. Moon is 80% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 71% with SNR of 6.8 for the occulted depth (per occulted point)
Apparent velocity is 15.8 km/sec on the sky relative to the star, or, 17.8 arcsec/hr.
Position angle of asteroid motion is 54.7 degrees
The recommended exposure time corresponds to 7.1 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 19.3 km.
The sky-plane scale is 3197.3 km/arcsec.
Diameter estimates:
54.0 km assuming a 5% albedo, maximum of 3.4 sec for a central chord
22.0 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 49.2 km used for deployment plan.
Star training set for 9023_Mnesthus, (2026/10/30 00:37UT) Object RA Dec mag sep mel Rigel 05:15:49.7 -08:10:22 0.1 13.19 37 67Bet Eri 05:09:10.2 -05:03:14 2.8 11.69 35 PPM 186813 04:21:57.7 -06:11:03 6.5 0.82 41 PPM 186788 04:20:21.0 -07:21:36 8.1 0.72 42 PPM 186828 04:22:53.2 -07:03:41 9.3 0.09 42 9023_Mnesthus 04:22:48.3 -06:58:26 15.4 41 Positions are for equinox of date
Star training set for 9023_Mnesthus, (2026/10/30 00:37UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 13.19 37 67Bet Eri 05:07:50.8 -05:05:13 2.8 11.69 35 PPM 186813 04:20:38.8 -06:14:47 6.5 0.82 41 PPM 186788 04:19:02.7 -07:25:24 8.1 0.72 42 PPM 186828 04:21:34.8 -07:07:23 9.3 0.09 42 9023_Mnesthus 04:21:29.8 -07:02:09 15.4 42 Positions are for J2000