Occultation event with (17365) Thymbraeus, event index number 5147
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/09 23:40:16 UTC
J2000 position of star is 04:59:09.8 +21:38:59
Equinox of date position of star is 05:00:46.4 +21:41:19
Star is 167 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=12.7, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.8 per integration for unocculted signal
Expected flux drop is 89% with SNR of 12.3 for the occulted depth (per occulted point)
Apparent velocity is 17.3 km/sec on the sky relative to the star, or, 21.0 arcsec/hr.
Position angle of asteroid motion is 75.1 degrees
The recommended exposure time corresponds to 2.1 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 42.5 km.
The sky-plane scale is 2963.8 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, (2026/12/09 23:40UT) Object RA Dec mag sep mel Aldebaran 04:37:28.2 +16:33:41 0.8 7.52 159 Alnath 05:27:59.8 +28:37:39 1.6 9.27 174 102Iot Tau 05:04:42.5 +21:37:34 4.6 0.92 167 PPM 093957 05:01:50.0 +20:57:57 8.4 0.76 166 PPM 093937 05:00:39.5 +21:46:29 9.9 0.09 167 17365_Thymbrae 05:00:46.4 +21:41:19 15.0 167 Positions are for equinox of date
Star training set for 17365_Thymbraeus, (2026/12/09 23:40UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 7.52 159 Alnath 05:26:17.6 +28:36:22 1.6 9.27 174 102Iot Tau 05:03:05.9 +21:35:23 4.6 0.92 167 PPM 093957 05:00:13.9 +20:55:40 8.4 0.76 166 PPM 093937 04:59:02.7 +21:44:09 9.9 0.09 167 17365_Thymbrae 04:59:09.8 +21:38:59 15.0 167 Positions are for J2000