Occultation event with (17365) Thymbraeus, event index number 4126
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/30 08:00:35 UTC
J2000 position of star is 05:10:37.5 +23:54:27
Equinox of date position of star is 05:12:14.9 +23:56:20
Star is 76 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=16.5, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.00 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 41% with SNR of 1.2 for the occulted depth (per occulted point)
Apparent velocity is 18.8 km/sec on the sky relative to the star, or, 18.2 arcsec/hr.
Position angle of asteroid motion is 92.1 degrees
The recommended exposure time corresponds to 18.8 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 41.5 km.
The sky-plane scale is 3722.8 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 2.5 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 44.9 km used for deployment plan.
Star training set for 17365_Thymbraeus, (2026/08/30 08:01UT) Object RA Dec mag sep mel Aldebaran 04:37:27.2 +16:33:39 0.8 11.00 67 Alnath 05:27:58.8 +28:37:39 1.6 5.87 79 103 Tau 05:09:44.3 +24:17:52 5.3 0.68 75 PPM 094178 05:14:41.2 +24:25:35 8.4 0.74 76 PPM 094138 05:12:08.6 +24:11:40 9.8 0.26 76 17365_Thymbrae 05:12:14.9 +23:56:20 16.1 76 Positions are for equinox of date
Star training set for 17365_Thymbraeus, (2026/08/30 08:01UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 11.00 67 Alnath 05:26:17.6 +28:36:22 1.6 5.87 79 103 Tau 05:08:06.6 +24:15:54 5.3 0.68 75 PPM 094178 05:13:03.4 +24:23:48 8.4 0.74 76 PPM 094138 05:10:30.9 +24:09:47 9.8 0.26 76 17365_Thymbrae 05:10:37.5 +23:54:27 16.1 76 Positions are for J2000