Occultation event with (17365) Thymbraeus, event index number 5168
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/11 03:47:40 UTC
J2000 position of star is 04:58:28.9 +21:36:27
Equinox of date position of star is 05:00:05.6 +21:38:48
Star is 153 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 4.7 per integration for unocculted signal
Expected flux drop is 37% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 17.2 km/sec on the sky relative to the star, or, 20.9 arcsec/hr.
Position angle of asteroid motion is 75.0 degrees
The recommended exposure time corresponds to 11.2 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 42.7 km.
The sky-plane scale is 2964.9 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 2.7 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 44.9 km used for deployment plan.
Star training set for 17365_Thymbraeus, (2026/12/11 03:48UT) Object RA Dec mag sep mel Aldebaran 04:37:28.2 +16:33:41 0.8 7.38 147 Alnath 05:27:59.8 +28:37:39 1.6 9.41 160 102Iot Tau 05:04:42.5 +21:37:34 4.6 1.07 154 PPM 093957 05:01:50.0 +20:57:57 8.4 0.79 153 PPM 093937 05:00:39.5 +21:46:29 9.9 0.18 153 17365_Thymbrae 05:00:05.6 +21:38:48 15.0 154 Positions are for equinox of date
Star training set for 17365_Thymbraeus, (2026/12/11 03:48UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 7.38 147 Alnath 05:26:17.6 +28:36:22 1.6 9.41 160 102Iot Tau 05:03:05.9 +21:35:23 4.6 1.07 154 PPM 093957 05:00:13.9 +20:55:40 8.4 0.79 153 PPM 093937 04:59:02.7 +21:44:09 9.9 0.18 153 17365_Thymbrae 04:58:28.9 +21:36:27 15.0 153 Positions are for J2000