Occultation event with (1208) Troilus, event index number 5084
Regions able to see the event: SMexico
Geocentric closest approach at 2026/12/07 03:08:38 UTC
J2000 position of star is 05:16:03.5 +46:37:59
Equinox of date position of star is 05:18:03.8 +46:39:40
Star is 147 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=13.4, apparent brightess of occulting body is G=14.1
Use an exposure time of 0.17 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 65% with SNR of 6.4 for the occulted depth (per occulted point)
Apparent velocity is 20.0 km/sec on the sky relative to the star, or, 22.7 arcsec/hr.
Position angle of asteroid motion is 106.4 degrees
The recommended exposure time corresponds to 3.4 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 32.7 km.
The sky-plane scale is 3177.9 km/arcsec.
Diameter estimates:
92.9 km assuming a 5% albedo, maximum of 4.6 sec for a central chord
37.9 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 100.5 km used for deployment plan.
Star training set for 1208_Troilus, (2026/12/07 03:09UT) Object RA Dec mag sep mel Aldebaran 04:37:28.2 +16:33:40 0.8 31.26 161 34Bet Aur 06:01:30.3 +44:56:50 1.9 7.76 141 PPM 047798 05:12:43.6 +46:59:33 6.0 0.97 148 PPM 047903 05:17:29.6 +46:26:04 7.5 0.25 148 1208_Troilus 05:18:03.8 +46:39:40 14.1 147 Positions are for equinox of date
Star training set for 1208_Troilus, (2026/12/07 03:09UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 31.26 161 34Bet Aur 05:59:31.6 +44:56:51 1.9 7.76 141 PPM 047798 05:10:43.1 +46:57:40 6.0 0.97 148 PPM 047903 05:15:29.6 +46:24:22 7.5 0.25 148 1208_Troilus 05:16:03.5 +46:37:59 14.1 147 Positions are for J2000