Occultation event with (17365) Thymbraeus, event index number 4665
Regions able to see the event: Australia
Geocentric closest approach at 2026/11/13 12:29:51 UTC
J2000 position of star is 05:13:33.4 +22:33:11
Equinox of date position of star is 05:15:10.7 +22:34:58
Star is 161 degrees from the moon. Moon is 16% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 3.9 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.4 for the occulted depth (per occulted point)
Apparent velocity is 13.9 km/sec on the sky relative to the star, or, 16.5 arcsec/hr.
Position angle of asteroid motion is 73.7 degrees
The recommended exposure time corresponds to 11.1 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 42.5 km.
The sky-plane scale is 3021.0 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 3.4 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 44.9 km used for deployment plan.
Star training set for 17365_Thymbraeus, (2026/11/13 12:30UT) Object RA Dec mag sep mel Aldebaran 04:37:27.9 +16:33:40 0.8 10.73 150 Alnath 05:27:59.6 +28:37:39 1.6 6.70 165 108 Tau 05:17:04.7 +22:18:47 6.2 0.52 161 PPM 094191 05:15:56.2 +22:41:20 9.9 0.20 161 17365_Thymbrae 05:15:10.7 +22:34:58 15.4 161 Positions are for equinox of date
Star training set for 17365_Thymbraeus, (2026/11/13 12:30UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 10.73 150 Alnath 05:26:17.6 +28:36:22 1.6 6.70 165 108 Tau 05:15:27.6 +22:17:05 6.2 0.52 161 PPM 094191 05:14:18.9 +22:39:35 9.9 0.20 161 17365_Thymbrae 05:13:33.4 +22:33:11 15.4 161 Positions are for J2000