Occultation event with (12238) Actor, event index number 3586
Regions able to see the event: SAmericaS
Geocentric closest approach at 2026/04/06 06:20:43 UTC
J2000 position of star is 11:57:14.4 -17:48:02
Equinox of date position of star is 11:58:35.1 -17:56:49
Star is 57 degrees from the moon. Moon is 84% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 63% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 18.5 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 128.7 degrees
The recommended exposure time corresponds to 7.4 km per image.
The 1-sigma error in the time of the event is 1.6 seconds.
The 1-sigma cross-track error in the shadow position is 27.5 km.
The sky-plane scale is 3397.0 km/arcsec.
Diameter estimates:
39.3 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
16.0 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 30.3 km used for deployment plan.
Star training set for 12238_Actor, (2026/04/06 06:21UT) Object RA Dec mag sep mel Spica 13:26:34.8 -11:17:51 1.0 22.28 40 4Gam Crv 12:17:09.6 -17:41:15 2.6 4.43 53 30Eta Crt 11:57:21.5 -17:17:49 5.2 0.71 57 PPM 225052 11:54:16.9 -18:12:45 8.1 1.06 58 PPM 225181 11:59:19.8 -17:49:21 9.5 0.22 57 12238_Actor 11:58:35.1 -17:56:49 16.2 56 Positions are for equinox of date
Star training set for 12238_Actor, (2026/04/06 06:21UT) Object RA Dec mag sep mel Spica 13:25:11.5 -11:09:41 1.0 22.28 40 4Gam Crv 12:15:48.1 -17:32:30 2.6 4.43 53 30Eta Crt 11:56:00.9 -17:09:03 5.2 0.71 57 PPM 225052 11:52:56.5 -18:03:59 8.1 1.06 58 PPM 225181 11:57:59.1 -17:40:35 9.5 0.22 57 12238_Actor 11:57:14.4 -17:48:02 16.2 57 Positions are for J2000