Occultation event with (12238) Actor, event index number 879
Regions able to see the event: SAfrica
Geocentric closest approach at 2025/04/03 19:20:59 UTC
J2000 position of star is 09:48:44.7 -11:05:22
Equinox of date position of star is 09:49:58.8 -11:12:28
Star is 70 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=16.3
Use an exposure time of 0.70 seconds with the standard RECON-QHY system.
Expected flux drop is 32% with SNR of 5.8 per integration
Apparent velocity is 13.5 km/sec on the sky relative to the star, or, 14.5 arcsec/hr.
The recommended exposure time corresponds to 9.5 km per image.
The 1-sigma error in the time of the event is 2.3 seconds.
The 1-sigma cross-track error in the shadow position is 48.7 km.
The sky-plane scale is 3346.9 km/arcsec.
Diameter estimates:
38.7 km assuming a 5% albedo, aximum of 2.9 sec for a central chord
15.8 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 38.7 km used for deployment plan.
Star training set for 12238_Actor, (2025/04/03 19:21UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 23.57 62 Alphard 09:28:49.7 -08:46:09 2.0 5.75 64 8Gam Sex 09:53:45.5 -08:13:30 4.8 3.12 69 PPM 222001 09:48:19.3 -10:38:27 7.3 0.70 69 PPM 222050 09:50:06.2 -10:56:36 9.3 0.27 70 12238_Actor 09:49:58.8 -11:12:28 16.3 70 Positions are for equinox of date
Star training set for 12238_Actor, (2025/04/03 19:21UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 23.57 62 Alphard 09:27:35.2 -08:39:30 2.0 5.75 64 8Gam Sex 09:52:30.3 -08:06:19 4.8 3.12 69 PPM 222001 09:47:05.0 -10:31:23 7.3 0.70 69 PPM 222050 09:48:52.0 -10:49:29 9.3 0.27 70 12238_Actor 09:48:44.7 -11:05:22 16.3 70 Positions are for J2000