Occultation event with (12714) Alkimos, event index number 4025
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/08/16 22:51:41 UTC
J2000 position of star is 12:20:01.6 -11:10:23
Equinox of date position of star is 12:21:24.1 -11:19:14
Star is 10 degrees from the moon. Moon is 21% illuminated.
Stellar brightness G=14.2, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 9.8 per integration for unocculted signal
Expected flux drop is 85% with SNR of 8.3 for the occulted depth (per occulted point)
Apparent velocity is 33.9 km/sec on the sky relative to the star, or, 28.5 arcsec/hr.
Position angle of asteroid motion is 109.8 degrees
The recommended exposure time corresponds to 11.9 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 27.6 km.
The sky-plane scale is 4284.8 km/arcsec.
Diameter estimates:
53.5 km assuming a 5% albedo, maximum of 1.6 sec for a central chord
21.8 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 47.8 km used for deployment plan.
Star training set for 12714_Alkimos, (2026/08/16 22:52UT) Object RA Dec mag sep mel Spica 13:26:36.0 -11:17:58 1.0 15.98 6 4Gam Crv 12:17:10.8 -17:41:23 2.6 6.45 13 PPM 225764 12:24:41.4 -11:57:34 6.4 1.03 9 PPM 225681 12:21:11.6 -11:07:39 8.6 0.20 10 12714_Alkimos 12:21:24.1 -11:19:14 16.1 9 Positions are for equinox of date
Star training set for 12714_Alkimos, (2026/08/16 22:52UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 15.98 6 4Gam Crv 12:15:48.1 -17:32:30 2.6 6.45 13 PPM 225764 12:23:18.8 -11:48:44 6.4 1.03 9 PPM 225681 12:19:49.1 -10:58:47 8.6 0.20 10 12714_Alkimos 12:20:01.6 -11:10:23 16.1 10 Positions are for J2000