Occultation event with (1208) Troilus, event index number 4373
Regions able to see the event: Europe,SAfrica
Geocentric closest approach at 2026/10/10 01:24:54 UTC
J2000 position of star is 05:43:56.6 +41:52:44
Equinox of date position of star is 05:45:51.0 +41:53:20
Star is 103 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=14.6
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
SNR of 5.0 per integration for unocculted signal
Expected flux drop is 20% with SNR of 1.0 for the occulted depth (per occulted point)
Apparent velocity is 14.5 km/sec on the sky relative to the star, or, 14.9 arcsec/hr.
Position angle of asteroid motion is 1.4 degrees
The recommended exposure time corresponds to 24.7 km per image.
The 1-sigma error in the time of the event is 2.0 seconds.
The 1-sigma cross-track error in the shadow position is 14.7 km.
The sky-plane scale is 3518.2 km/arcsec.
Diameter estimates:
92.9 km assuming a 5% albedo, maximum of 6.4 sec for a central chord
37.9 km assuming a 30% albedo, maximum of 2.6 sec for a central chord
Cross-track diameter of 100.5 km used for deployment plan.
Star training set for 1208_Troilus, (2026/10/10 01:25UT) Object RA Dec mag sep mel Pollux 07:46:57.1 +27:57:33 1.1 28.25 77 34Bet Aur 06:01:29.6 +44:56:50 1.9 4.17 100 PPM 048445 05:49:09.8 +42:32:02 6.3 0.89 102 PPM 048383 05:45:08.1 +41:42:21 7.3 0.23 103 PPM 048405 05:46:34.0 +41:50:27 9.6 0.14 103 1208_Troilus 05:45:51.0 +41:53:20 14.6 103 Positions are for equinox of date
Star training set for 1208_Troilus, (2026/10/10 01:25UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 28.25 77 34Bet Aur 05:59:31.6 +44:56:51 1.9 4.17 100 PPM 048445 05:47:14.7 +42:31:34 6.3 0.89 102 PPM 048383 05:43:14.0 +41:41:44 7.3 0.23 103 PPM 048405 05:44:39.7 +41:49:53 9.6 0.14 103 1208_Troilus 05:43:56.6 +41:52:44 14.6 103 Positions are for J2000