Occultation event with (34746) Thoon, event index number 1446
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/02 07:00:06 UTC
J2000 position of star is 02:36:49.4 -16:03:36
Equinox of date position of star is 02:38:02.5 -15:56:55
Star is 46 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=16.2, apparent brightess of occulting body is G=14.9
Use an exposure time of 0.85 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 23% with SNR of 0.7 for the occulted depth (per occulted point)
Apparent velocity is 17.6 km/sec on the sky relative to the star, or, 20.4 arcsec/hr.
Position angle of asteroid motion is 86.7 degrees
The recommended exposure time corresponds to 15.0 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 18.4 km.
The sky-plane scale is 3115.7 km/arcsec.
Diameter estimates:
64.0 km assuming a 5% albedo, aximum of 3.6 sec for a central chord
26.1 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 61.7 km used for deployment plan.
Star training set for 34746_Thoon, (2025/11/02 07:00UT) Object RA Dec mag sep mel Rigel 05:15:46.8 -08:10:25 0.1 39.27 84 68Omi Cet 02:20:39.2 -02:51:42 2.0 13.77 40 76Sig Cet 02:33:18.8 -15:07:57 4.8 1.40 45 PPM 211717 02:36:18.6 -15:28:17 8.5 0.63 45 PPM 211775 02:38:46.0 -16:04:51 8.9 0.22 46 34746_Thoon 02:38:02.5 -15:56:55 14.9 46 Positions are for equinox of date
Star training set for 34746_Thoon, (2025/11/02 07:00UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 39.27 84 68Omi Cet 02:19:20.8 -02:58:46 2.0 13.77 40 76Sig Cet 02:32:05.1 -15:14:44 4.8 1.40 45 PPM 211717 02:35:05.2 -15:35:00 8.5 0.63 45 PPM 211775 02:37:33.0 -16:11:30 8.9 0.22 46 34746_Thoon 02:36:49.4 -16:03:36 14.9 46 Positions are for J2000