Occultation event with (34746) Thoon, event index number 1360
Regions able to see the event: Australia
Geocentric closest approach at 2025/10/11 14:47:56 UTC
J2000 position of star is 02:48:25.4 -15:25:51
Equinox of date position of star is 02:49:38.3 -15:19:28
Star is 57 degrees from the moon. Moon is 73% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.20 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 19% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 18.6 arcsec/hr.
Position angle of asteroid motion is 67.6 degrees
The recommended exposure time corresponds to 19.4 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 12.8 km.
The sky-plane scale is 3123.7 km/arcsec.
Diameter estimates:
64.0 km assuming a 5% albedo, aximum of 4.0 sec for a central chord
26.1 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 61.7 km used for deployment plan.
Star training set for 34746_Thoon, (2025/10/11 14:48UT) Object RA Dec mag sep mel Rigel 05:15:46.7 -08:10:26 0.1 36.43 36 68Omi Cet 02:20:39.0 -02:51:43 2.0 14.36 53 PPM 211864 02:42:47.6 -14:26:24 6.4 1.88 57 PPM 211984 02:48:22.3 -15:16:13 8.4 0.31 57 PPM 212016 02:49:32.0 -15:07:38 9.8 0.20 56 34746_Thoon 02:49:38.3 -15:19:28 14.9 56 Positions are for equinox of date
Star training set for 34746_Thoon, (2025/10/11 14:48UT) Object RA Dec mag sep mel Rigel 05:14:32.3 -08:12:06 0.1 36.43 36 68Omi Cet 02:19:20.8 -02:58:46 2.0 14.36 53 PPM 211864 02:41:34.1 -14:32:57 6.4 1.88 57 PPM 211984 02:47:09.3 -15:22:37 8.4 0.31 57 PPM 212016 02:48:19.0 -15:14:01 9.8 0.20 56 34746_Thoon 02:48:25.4 -15:25:51 14.9 57 Positions are for J2000