Occultation event with (34746) Thoon, event index number 1135
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/07/13 10:08:23 UTC
J2000 position of star is 02:44:22.4 -10:50:09
Equinox of date position of star is 02:45:36.6 -10:43:44
Star is 73 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=14.4, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 74% with SNR of 6.9 for the occulted depth (per occulted point)
Apparent velocity is 21.4 km/sec on the sky relative to the star, or, 20.2 arcsec/hr.
The recommended exposure time corresponds to 8.6 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 19.4 km.
The sky-plane scale is 3820.2 km/arcsec.
Diameter estimates:
64.0 km assuming a 5% albedo, aximum of 3.0 sec for a central chord
26.1 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 64.0 km used for deployment plan.
Star training set for 34746_Thoon, (2025/07/13 10:08UT) Object RA Dec mag sep mel Rigel 05:15:46.0 -08:10:27 0.1 37.10 109 68Omi Cet 02:20:38.3 -02:51:47 2.0 10.01 69 83Eps Cet 02:40:48.0 -11:45:54 4.3 1.57 72 PPM 212038 02:50:34.4 -10:26:46 7.9 1.25 75 PPM 211934 02:45:59.1 -10:51:22 9.6 0.16 73 34746_Thoon 02:45:36.6 -10:43:44 15.5 74 Positions are for equinox of date
Star training set for 34746_Thoon, (2025/07/13 10:08UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 37.10 109 68Omi Cet 02:19:20.8 -02:58:46 2.0 10.01 69 83Eps Cet 02:39:34.1 -11:52:26 4.3 1.57 72 PPM 212038 02:49:20.1 -10:33:03 7.9 1.25 75 PPM 211934 02:44:45.0 -10:57:47 9.6 0.16 73 34746_Thoon 02:44:22.4 -10:50:09 15.5 73 Positions are for J2000