Occultation event with (3708) Socus, event index number 1534
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/11/18 04:50:25 UTC
J2000 position of star is 03:05:29.7 +32:18:18
Equinox of date position of star is 03:07:05.2 +32:24:15
Star is 158 degrees from the moon. Moon is 4% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=13.7
Use an exposure time of 0.95 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 28% with SNR of 2.7 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 21.3 arcsec/hr.
Position angle of asteroid motion is 65.5 degrees
The recommended exposure time corresponds to 15.4 km per image.
The 1-sigma error in the time of the event is 1.2 seconds.
The 1-sigma cross-track error in the shadow position is 29.5 km.
The sky-plane scale is 2738.7 km/arcsec.
Diameter estimates:
83.2 km assuming a 5% albedo, aximum of 5.1 sec for a central chord
34.0 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 75.7 km used for deployment plan.
Star training set for 3708_Socus, (2025/11/18 04:50UT) Object RA Dec mag sep mel Aldebaran 04:37:24.5 +16:33:33 0.8 25.85 143 Algol 03:09:51.8 +41:03:12 2.1 8.67 151 21 Per 02:58:52.0 +32:02:12 5.1 1.78 160 PPM 068086 03:07:21.0 +32:07:46 8.5 0.28 158 PPM 068072 03:06:42.1 +32:38:59 9.5 0.26 158 PPM 068098 03:08:08.7 +32:21:12 10.3 0.23 158 3708_Socus 03:07:05.2 +32:24:15 13.7 158 Positions are for equinox of date
Star training set for 3708_Socus, (2025/11/18 04:50UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 25.85 143 Algol 03:08:10.1 +40:57:20 2.1 8.67 151 21 Per 02:57:17.3 +31:56:02 5.1 1.78 160 PPM 068086 03:05:45.7 +32:01:50 8.5 0.28 158 PPM 068072 03:05:06.5 +32:33:02 9.5 0.26 158 PPM 068098 03:06:33.1 +32:15:17 10.3 0.23 158 3708_Socus 03:05:29.7 +32:18:18 13.7 158 Positions are for J2000