Occultation event with (34746) Thoon, event index number 3846
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/07/14 07:47:08 UTC
J2000 position of star is 04:16:32.2 +04:51:41
Equinox of date position of star is 04:17:56.5 +04:55:32
Star is 51 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=15.7
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.3 per integration for unocculted signal
Expected flux drop is 79% with SNR of 7.3 for the occulted depth (per occulted point)
Apparent velocity is 31.0 km/sec on the sky relative to the star, or, 26.4 arcsec/hr.
Position angle of asteroid motion is 81.5 degrees
The recommended exposure time corresponds to 10.9 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 17.6 km.
The sky-plane scale is 4227.0 km/arcsec.
Diameter estimates:
64.0 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
26.1 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 61.7 km used for deployment plan.
Star training set for 34746_Thoon, (2026/07/14 07:47UT) Object RA Dec mag sep mel Aldebaran 04:37:26.8 +16:33:38 0.8 12.58 42 67Bet Eri 05:09:09.3 -05:03:15 2.8 16.22 46 45 Tau 04:12:45.2 +05:35:24 5.7 1.45 52 PPM 147386 04:18:35.8 +05:05:17 7.9 0.23 51 PPM 147379 04:18:18.9 +04:48:49 9.9 0.15 51 34746_Thoon 04:17:56.5 +04:55:32 15.7 51 Positions are for equinox of date
Star training set for 34746_Thoon, (2026/07/14 07:47UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 12.58 42 67Bet Eri 05:07:50.8 -05:05:13 2.8 16.22 46 45 Tau 04:11:20.5 +05:31:23 5.7 1.45 52 PPM 147386 04:17:11.4 +05:01:28 7.9 0.23 51 PPM 147379 04:16:54.7 +04:44:59 9.9 0.15 51 34746_Thoon 04:16:32.2 +04:51:41 15.7 51 Positions are for J2000