Occultation event with (1208) Troilus, event index number 4267
Regions able to see the event: Europe,Senegal
Geocentric closest approach at 2026/09/19 03:46:07 UTC
J2000 position of star is 05:40:05.6 +39:51:15
Equinox of date position of star is 05:41:57.4 +39:51:59
Star is 168 degrees from the moon. Moon is 53% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 50% with SNR of 4.9 for the occulted depth (per occulted point)
Apparent velocity is 17.8 km/sec on the sky relative to the star, or, 17.2 arcsec/hr.
Position angle of asteroid motion is 35.1 degrees
The recommended exposure time corresponds to 12.5 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 3.7 km.
The sky-plane scale is 3731.3 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, (2026/09/19 03:46UT) Object RA Dec mag sep mel Aldebaran 04:37:27.4 +16:33:39 0.8 27.19 158 34Bet Aur 06:01:29.4 +44:56:50 1.9 6.23 163 32Nu Aur 05:53:20.6 +39:09:12 4.0 2.31 169 PPM 070699 05:42:24.1 +39:50:46 8.0 0.09 168 1208_Troilus 05:41:57.4 +39:51:59 14.7 168 Positions are for equinox of date
Star training set for 1208_Troilus, (2026/09/19 03:46UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 27.19 158 34Bet Aur 05:59:31.6 +44:56:51 1.9 6.23 163 32Nu Aur 05:51:29.4 +39:08:55 4.0 2.31 169 PPM 070699 05:40:32.2 +39:50:03 8.0 0.09 168 1208_Troilus 05:40:05.6 +39:51:15 14.7 168 Positions are for J2000