Occultation event with (17365) Thymbraeus, event index number 3359
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/03/06 00:31:18 UTC
J2000 position of star is 02:32:46.1 +18:59:00
Equinox of date position of star is 02:34:14.0 +19:05:52
Star is 154 degrees from the moon. Moon is 93% illuminated.
Stellar brightness G=13.8, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 9.1 per integration for unocculted signal
Expected flux drop is 90% with SNR of 8.2 for the occulted depth (per occulted point)
Apparent velocity is 29.8 km/sec on the sky relative to the star, or, 27.4 arcsec/hr.
Position angle of asteroid motion is 79.7 degrees
The recommended exposure time corresponds to 6.0 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 38.7 km.
The sky-plane scale is 3926.3 km/arcsec.
Diameter estimates:
47.2 km assuming a 5% albedo, maximum of 1.6 sec for a central chord
19.3 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 44.9 km used for deployment plan.
Star training set for 17365_Thymbraeus, (2026/03/06 00:31UT) Object RA Dec mag sep mel Aldebaran 04:37:25.5 +16:33:35 0.8 29.39 125 Hamal 02:08:39.3 +23:35:06 2.0 7.46 157 26 Ari 02:32:06.8 +19:58:13 6.1 1.01 154 PPM 118332 02:35:04.7 +18:59:38 7.1 0.22 154 PPM 118317 02:33:57.9 +19:01:36 9.5 0.10 154 17365_Thymbrae 02:34:14.0 +19:05:52 16.1 154 Positions are for equinox of date
Star training set for 17365_Thymbraeus, (2026/03/06 00:31UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 29.39 125 Hamal 02:07:10.8 +23:27:41 2.0 7.46 157 26 Ari 02:30:38.5 +19:51:18 6.1 1.01 154 PPM 118332 02:33:36.7 +18:52:48 7.1 0.22 154 PPM 118317 02:32:29.9 +18:54:44 9.5 0.10 154 17365_Thymbrae 02:32:46.1 +18:59:00 16.1 154 Positions are for J2000