Occultation event with (3708) Socus, event index number 4193
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/07 05:51:44 UTC
J2000 position of star is 06:07:23.3 +30:02:51
Equinox of date position of star is 06:09:06.0 +30:02:32
Star is 22 degrees from the moon. Moon is 19% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.40 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 18% with SNR of 0.5 for the occulted depth (per occulted point)
Apparent velocity is 20.7 km/sec on the sky relative to the star, or, 19.4 arcsec/hr.
Position angle of asteroid motion is 89.7 degrees
The recommended exposure time corresponds to 28.9 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 33.2 km.
The sky-plane scale is 3836.3 km/arcsec.
Diameter estimates:
83.2 km assuming a 5% albedo, maximum of 4.0 sec for a central chord
34.0 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 75.7 km used for deployment plan.
Star training set for 3708_Socus, (2026/09/07 05:52UT) Object RA Dec mag sep mel Pollux 07:46:56.7 +27:57:34 1.1 21.45 4 Alnath 05:27:58.9 +28:37:39 1.6 9.07 31 PPM 071108 06:02:53.5 +31:01:59 6.0 1.66 24 PPM 095388 06:08:04.6 +29:30:28 8.1 0.58 22 PPM 071259 06:09:59.9 +30:14:43 9.1 0.28 22 PPM 071247 06:09:31.3 +30:06:02 10.9 0.11 22 3708_Socus 06:09:06.0 +30:02:32 14.9 22 Positions are for equinox of date
Star training set for 3708_Socus, (2026/09/07 05:52UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 21.45 4 Alnath 05:26:17.6 +28:36:22 1.6 9.07 31 PPM 071108 06:01:10.0 +31:02:04 6.0 1.66 24 PPM 095388 06:06:22.4 +29:30:45 8.1 0.58 22 PPM 071259 06:08:17.1 +30:15:04 9.1 0.28 22 PPM 071247 06:07:48.5 +30:06:22 10.9 0.11 22 3708_Socus 06:07:23.3 +30:02:51 14.9 22 Positions are for J2000