Occultation event with (12238) Actor, event index number 3759
Regions able to see the event: Australia
Geocentric closest approach at 2026/05/23 10:07:21 UTC
J2000 position of star is 11:46:13.1 -14:01:11
Equinox of date position of star is 11:47:33.8 -14:09:59
Star is 34 degrees from the moon. Moon is 50% illuminated.
Stellar brightness G=12.8, apparent brightess of occulting body is G=16.7
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 13.1 per integration for unocculted signal
Expected flux drop is 97% with SNR of 12.7 for the occulted depth (per occulted point)
Apparent velocity is 9.9 km/sec on the sky relative to the star, or, 9.7 arcsec/hr.
Position angle of asteroid motion is 2.0 degrees
The recommended exposure time corresponds to 1.2 km per image.
The 1-sigma error in the time of the event is 4.0 seconds.
The 1-sigma cross-track error in the shadow position is 7.9 km.
The sky-plane scale is 3697.8 km/arcsec.
Diameter estimates:
39.3 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
16.0 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 30.3 km used for deployment plan.
Star training set for 12238_Actor, (2026/05/23 10:07UT) Object RA Dec mag sep mel Spica 13:26:35.2 -11:17:54 1.0 24.30 52 4Gam Crv 12:17:10.0 -17:41:18 2.6 7.94 41 PPM 224734 11:41:11.4 -14:36:54 6.5 1.61 33 PPM 224818 11:44:54.8 -14:10:03 8.5 0.64 33 PPM 224876 11:47:13.0 -14:00:51 9.4 0.17 34 12238_Actor 11:47:33.8 -14:09:59 16.7 34 Positions are for equinox of date
Star training set for 12238_Actor, (2026/05/23 10:07UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 24.30 52 4Gam Crv 12:15:48.1 -17:32:30 2.6 7.94 41 PPM 224734 11:39:51.1 -14:28:07 6.5 1.61 33 PPM 224818 11:43:34.2 -14:01:15 8.5 0.64 33 PPM 224876 11:45:52.3 -13:52:03 9.4 0.17 34 12238_Actor 11:46:13.1 -14:01:11 16.7 34 Positions are for J2000