Occultation event with (34746) Thoon, event index number 3220
Regions able to see the event: NMexico,SMexico
Geocentric closest approach at 2026/02/07 03:41:35 UTC
J2000 position of star is 02:21:37.8 -08:34:08
Equinox of date position of star is 02:22:55.0 -08:27:02
Star is 154 degrees from the moon. Moon is 72% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=15.6
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 38% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 25.4 km/sec on the sky relative to the star, or, 23.3 arcsec/hr.
Position angle of asteroid motion is 38.0 degrees
The recommended exposure time corresponds to 16.5 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 2.0 km.
The sky-plane scale is 3913.4 km/arcsec.
Diameter estimates:
64.0 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
26.1 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 61.7 km used for deployment plan.
Star training set for 34746_Thoon, (2026/02/07 03:42UT) Object RA Dec mag sep mel Aldebaran 04:37:25.3 +16:33:35 0.8 41.62 131 68Omi Cet 02:20:40.0 -02:51:38 2.0 5.62 158 PPM 184374 02:15:10.7 -08:56:37 6.4 1.97 155 PPM 184461 02:19:45.3 -08:14:24 7.7 0.81 154 PPM 184522 02:22:17.2 -08:37:02 9.3 0.23 154 34746_Thoon 02:22:55.0 -08:27:02 15.6 154 Positions are for equinox of date
Star training set for 34746_Thoon, (2026/02/07 03:42UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 41.62 131 68Omi Cet 02:19:20.8 -02:58:46 2.0 5.62 158 PPM 184374 02:13:53.5 -09:03:52 6.4 1.97 155 PPM 184461 02:18:28.0 -08:21:33 7.7 0.81 154 PPM 184522 02:21:00.0 -08:44:08 9.3 0.23 154 34746_Thoon 02:21:37.8 -08:34:08 15.6 154 Positions are for J2000