Occultation event with (3708) Socus, event index number 4279
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/21 04:12:47 UTC
J2000 position of star is 06:14:35.9 +30:03:23
Equinox of date position of star is 06:16:18.7 +30:02:47
Star is 159 degrees from the moon. Moon is 71% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=14.9
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 6.4 per integration for unocculted signal
Expected flux drop is 32% with SNR of 2.1 for the occulted depth (per occulted point)
Apparent velocity is 14.4 km/sec on the sky relative to the star, or, 14.1 arcsec/hr.
Position angle of asteroid motion is 89.5 degrees
The recommended exposure time corresponds to 18.8 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 33.4 km.
The sky-plane scale is 3694.4 km/arcsec.
Diameter estimates:
83.2 km assuming a 5% albedo, maximum of 5.8 sec for a central chord
34.0 km assuming a 30% albedo, maximum of 2.4 sec for a central chord
Cross-track diameter of 75.7 km used for deployment plan.
Star training set for 3708_Socus, (2026/09/21 04:13UT) Object RA Dec mag sep mel Pollux 07:46:56.9 +27:57:34 1.1 19.89 176 Alnath 05:27:59.0 +28:37:39 1.6 10.62 149 44Kap Aur 06:17:04.9 +29:29:08 4.3 0.59 160 PPM 071435 06:18:03.4 +30:05:29 7.0 0.38 160 PPM 095681 06:17:47.3 +29:57:57 9.9 0.33 160 PPM 071409 06:17:18.1 +30:01:31 10.2 0.22 160 3708_Socus 06:16:18.7 +30:02:47 14.9 160 Positions are for equinox of date
Star training set for 3708_Socus, (2026/09/21 04:13UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 19.89 176 Alnath 05:26:17.6 +28:36:22 1.6 10.62 149 44Kap Aur 06:15:22.5 +29:29:46 4.3 0.59 160 PPM 071435 06:16:20.6 +30:06:09 7.0 0.38 160 PPM 095681 06:16:04.6 +29:58:37 9.9 0.33 160 PPM 071409 06:15:35.3 +30:02:09 10.2 0.22 160 3708_Socus 06:14:35.9 +30:03:23 14.9 159 Positions are for J2000