Occultation event with (34746) Thoon, event index number 1282
Regions able to see the event: NZ
Geocentric closest approach at 2025/09/14 15:47:36 UTC
J2000 position of star is 02:57:36.0 -13:48:29
Equinox of date position of star is 02:58:49.2 -13:42:22
Star is 57 degrees from the moon. Moon is 48% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 54% with SNR of 5.3 for the occulted depth (per occulted point)
Apparent velocity is 10.9 km/sec on the sky relative to the star, or, 12.0 arcsec/hr.
Position angle of asteroid motion is 33.3 degrees
The recommended exposure time corresponds to 9.8 km per image.
The 1-sigma error in the time of the event is 2.1 seconds.
The 1-sigma cross-track error in the shadow position is 0.7 km.
The sky-plane scale is 3251.5 km/arcsec.
Diameter estimates:
64.0 km assuming a 5% albedo, aximum of 5.9 sec for a central chord
26.1 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 61.7 km used for deployment plan.
Star training set for 34746_Thoon, (2025/09/14 15:48UT) Object RA Dec mag sep mel Rigel 05:15:46.5 -08:10:26 0.1 34.04 37 68Omi Cet 02:20:38.8 -02:51:44 2.0 14.37 57 PPM 212115 02:53:46.6 -12:40:01 6.0 1.61 57 PPM 212182 02:57:07.6 -13:35:54 8.1 0.43 57 PPM 212223 02:58:43.2 -13:58:38 9.9 0.27 57 34746_Thoon 02:58:49.2 -13:42:22 15.1 57 Positions are for equinox of date
Star training set for 34746_Thoon, (2025/09/14 15:48UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 34.04 37 68Omi Cet 02:19:20.8 -02:58:46 2.0 14.37 57 PPM 212115 02:52:32.9 -12:46:16 6.0 1.61 57 PPM 212182 02:55:54.4 -13:42:03 8.1 0.43 57 PPM 212223 02:57:30.2 -14:04:46 9.9 0.27 57 34746_Thoon 02:57:36.0 -13:48:29 15.1 57 Positions are for J2000