Occultation event with (1208) Troilus, event index number 4882
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/25 17:55:36 UTC
J2000 position of star is 05:25:16.4 +46:01:22
Equinox of date position of star is 05:27:16.0 +46:02:41
Star is 19 degrees from the moon. Moon is 98% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 12% with SNR of 0.4 for the occulted depth (per occulted point)
Apparent velocity is 19.6 km/sec on the sky relative to the star, or, 22.0 arcsec/hr.
Position angle of asteroid motion is 115.8 degrees
The recommended exposure time corresponds to 24.5 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 33.9 km.
The sky-plane scale is 3198.2 km/arcsec.
Diameter estimates:
92.9 km assuming a 5% albedo, maximum of 4.7 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, (2026/11/25 17:56UT) Object RA Dec mag sep mel Aldebaran 04:37:28.0 +16:33:40 0.8 31.26 14 34Bet Aur 06:01:30.2 +44:56:50 1.9 6.10 20 PPM 048270 05:38:18.0 +47:43:48 6.1 2.53 21 PPM 048091 05:27:16.9 +45:15:02 8.5 0.79 18 PPM 048106 05:28:12.6 +45:49:07 10.0 0.28 18 PPM 048103 05:28:02.8 +46:12:10 11.2 0.21 19 1208_Troilus 05:27:16.0 +46:02:41 14.2 19 Positions are for equinox of date
Star training set for 1208_Troilus, (2026/11/25 17:56UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 31.26 14 34Bet Aur 05:59:31.6 +44:56:51 1.9 6.10 20 PPM 048270 05:36:16.0 +47:42:55 6.1 2.53 21 PPM 048091 05:25:18.4 +45:13:43 8.5 0.79 18 PPM 048106 05:26:13.3 +45:47:50 10.0 0.28 18 PPM 048103 05:26:03.0 +46:10:53 11.2 0.21 19 1208_Troilus 05:25:16.4 +46:01:22 14.2 19 Positions are for J2000