Occultation event with (12238) Actor, event index number 3719
Regions able to see the event: Australia
Geocentric closest approach at 2026/05/05 12:41:37 UTC
J2000 position of star is 11:47:49.7 -15:19:55
Equinox of date position of star is 11:49:10.2 -15:28:43
Star is 82 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=16.5
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 3.6 per integration for unocculted signal
Expected flux drop is 64% with SNR of 2.3 for the occulted depth (per occulted point)
Apparent velocity is 13.6 km/sec on the sky relative to the star, or, 13.9 arcsec/hr.
Position angle of asteroid motion is 150.8 degrees
The recommended exposure time corresponds to 7.5 km per image.
The 1-sigma error in the time of the event is 2.8 seconds.
The 1-sigma cross-track error in the shadow position is 13.6 km.
The sky-plane scale is 3540.7 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, (2026/05/05 12:42UT) Object RA Dec mag sep mel Spica 13:26:35.1 -11:17:53 1.0 24.04 63 4Gam Crv 12:17:09.9 -17:41:17 2.6 7.06 75 PPM 224734 11:41:11.3 -14:36:53 6.5 2.11 84 PPM 224921 11:49:13.7 -15:36:30 8.1 0.13 82 12238_Actor 11:49:10.2 -15:28:43 16.5 82 Positions are for equinox of date
Star training set for 12238_Actor, (2026/05/05 12:42UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 24.04 63 4Gam Crv 12:15:48.1 -17:32:30 2.6 7.06 75 PPM 224734 11:39:51.1 -14:28:07 6.5 2.11 84 PPM 224921 11:47:53.2 -15:27:43 8.1 0.13 82 12238_Actor 11:47:49.7 -15:19:55 16.5 82 Positions are for J2000