Occultation event with (1208) Troilus, event index number 4639
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/10 23:25:18 UTC
J2000 position of star is 05:35:08.4 +44:54:50
Equinox of date position of star is 05:37:06.6 +44:55:46
Star is 156 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=11.8, apparent brightess of occulting body is G=14.3
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 23.5 per integration for unocculted signal
Expected flux drop is 91% with SNR of 21.3 for the occulted depth (per occulted point)
Apparent velocity is 17.7 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 130.6 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 33.0 km.
The sky-plane scale is 3263.2 km/arcsec.
Diameter estimates:
92.9 km assuming a 5% albedo, maximum of 5.2 sec for a central chord
37.9 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 100.5 km used for deployment plan.
Star training set for 1208_Troilus, (2026/11/10 23:25UT) Object RA Dec mag sep mel Pollux 07:46:57.4 +27:57:33 1.1 30.82 135 34Bet Aur 06:01:30.0 +44:56:50 1.9 4.32 153 PPM 048270 05:38:17.8 +47:43:48 6.1 2.81 154 PPM 048271 05:38:15.0 +44:47:05 8.3 0.25 156 PPM 048254 05:37:23.5 +44:57:15 8.9 0.06 156 1208_Troilus 05:37:06.6 +44:55:46 14.3 156 Positions are for equinox of date
Star training set for 1208_Troilus, (2026/11/10 23:25UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 30.82 135 34Bet Aur 05:59:31.6 +44:56:51 1.9 4.32 153 PPM 048270 05:36:16.0 +47:42:55 6.1 2.81 154 PPM 048271 05:36:17.0 +44:46:12 8.3 0.25 156 PPM 048254 05:35:25.3 +44:56:19 8.9 0.06 156 1208_Troilus 05:35:08.4 +44:54:50 14.3 156 Positions are for J2000