Occultation event with (17365) Thymbraeus, event index number 3950
Regions able to see the event: SMexico
Geocentric closest approach at 2026/08/06 11:40:32 UTC
J2000 position of star is 04:55:14.7 +23:53:49
Equinox of date position of star is 04:56:51.7 +23:56:16
Star is 26 degrees from the moon. Moon is 46% illuminated.
Stellar brightness G=15.0, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 5.2 per integration for unocculted signal
Expected flux drop is 74% with SNR of 3.9 for the occulted depth (per occulted point)
Apparent velocity is 28.2 km/sec on the sky relative to the star, or, 25.6 arcsec/hr.
Position angle of asteroid motion is 88.1 degrees
The recommended exposure time corresponds to 9.9 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 42.3 km.
The sky-plane scale is 3962.3 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 44.9 km used for deployment plan.
Star training set for 17365_Thymbraeus, (2026/08/06 11:41UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 8.67 23 Alnath 05:27:58.5 +28:37:38 1.6 8.40 33 98 Tau 04:59:47.3 +25:05:20 5.8 1.33 27 PPM 093877 04:56:14.6 +23:58:44 8.5 0.15 26 PPM 093892 04:56:59.5 +23:55:50 10.4 0.03 26 17365_Thymbrae 04:56:51.7 +23:56:16 16.2 27 Positions are for equinox of date
Star training set for 17365_Thymbraeus, (2026/08/06 11:41UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 8.67 23 Alnath 05:26:17.6 +28:36:22 1.6 8.40 33 98 Tau 04:58:09.4 +25:03:00 5.8 1.33 27 PPM 093877 04:54:37.6 +23:56:16 8.5 0.15 26 PPM 093892 04:55:22.6 +23:53:24 10.4 0.03 26 17365_Thymbrae 04:55:14.7 +23:53:49 16.2 26 Positions are for J2000