Occultation event with (12238) Actor, event index number 3316
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/02/26 07:07:44 UTC
J2000 position of star is 12:14:29.3 -20:06:29
Equinox of date position of star is 12:15:50.6 -20:15:12
Star is 101 degrees from the moon. Moon is 70% illuminated.
Stellar brightness G=8.5, apparent brightess of occulting body is G=16.4
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 88.0 per integration for unocculted signal
Expected flux drop is 100% with SNR of 87.9 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 13.9 arcsec/hr.
Position angle of asteroid motion is 108.4 degrees
The recommended exposure time corresponds to 1.6 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 36.9 km.
The sky-plane scale is 3480.6 km/arcsec.
Diameter estimates:
39.3 km assuming a 5% albedo, maximum of 2.9 sec for a central chord
16.0 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 30.3 km used for deployment plan.
Star training set for 12238_Actor, (2026/02/26 07:08UT) Object RA Dec mag sep mel Spica 13:26:34.5 -11:17:49 1.0 19.21 113 4Gam Crv 12:17:09.3 -17:41:13 2.6 2.58 100 PPM 260055 12:16:20.9 -20:59:22 5.7 0.75 102 PPM 260026 12:15:05.9 -20:28:20 7.9 0.28 101 PPM 260041 12:15:50.6 -20:15:12 8.6 0.00 101 12238_Actor 12:15:50.6 -20:15:12 16.4 102 Positions are for equinox of date
Star training set for 12238_Actor, (2026/02/26 07:08UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 19.21 113 4Gam Crv 12:15:48.1 -17:32:30 2.6 2.58 100 PPM 260055 12:14:59.6 -20:50:39 5.7 0.75 102 PPM 260026 12:13:44.6 -20:19:36 7.9 0.28 101 PPM 260041 12:14:29.3 -20:06:29 8.6 0.00 101 12238_Actor 12:14:29.3 -20:06:29 16.4 101 Positions are for J2000