Occultation event with (1208) Troilus, event index number 4382
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/11 23:52:30 UTC
J2000 position of star is 05:43:56.1 +42:04:15
Equinox of date position of star is 05:45:50.7 +42:04:50
Star is 127 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.70 seconds with the standard RECON-QHY system.
SNR of 6.6 per integration for unocculted signal
Expected flux drop is 24% with SNR of 1.6 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 177.7 degrees
The recommended exposure time corresponds to 24.6 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 17.0 km.
The sky-plane scale is 3499.6 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, (2026/10/11 23:52UT) Object RA Dec mag sep mel Pollux 07:46:57.1 +27:57:33 1.1 28.31 102 34Bet Aur 06:01:29.6 +44:56:50 1.9 4.03 124 PPM 048445 05:49:09.8 +42:32:02 6.3 0.76 126 PPM 048383 05:45:08.1 +41:42:21 7.3 0.40 127 PPM 048389 05:45:24.3 +42:20:17 9.5 0.27 127 1208_Troilus 05:45:50.7 +42:04:50 14.5 127 Positions are for equinox of date
Star training set for 1208_Troilus, (2026/10/11 23:52UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 28.31 102 34Bet Aur 05:59:31.6 +44:56:51 1.9 4.03 124 PPM 048445 05:47:14.7 +42:31:34 6.3 0.76 126 PPM 048383 05:43:14.0 +41:41:44 7.3 0.40 127 PPM 048389 05:43:29.4 +42:19:41 9.5 0.27 127 1208_Troilus 05:43:56.1 +42:04:15 14.5 127 Positions are for J2000