Occultation event with (2920) Automedon, event index number 1099
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/27 22:52:22 UTC
J2000 position of star is 09:46:06.7 -05:50:28
Equinox of date position of star is 09:47:23.1 -05:57:35
Star is 30 degrees from the moon. Moon is 8% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.6
Use an exposure time of 0.80 seconds with the standard RECON-QHY system.
SNR of 5.1 per integration for unocculted signal
Expected flux drop is 29% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 31.1 km/sec on the sky relative to the star, or, 27.6 arcsec/hr.
Position angle of asteroid motion is 353.9 degrees
The recommended exposure time corresponds to 24.9 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 13.7 km.
The sky-plane scale is 4058.4 km/arcsec.
Diameter estimates:
101.9 km assuming a 5% albedo, aximum of 3.3 sec for a central chord
41.6 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 101.9 km used for deployment plan.
Star training set for 2920_Automedon, (2025/06/27 22:52UT) Object RA Dec mag sep mel Regulus 10:09:43.6 +11:50:30 1.3 18.65 20 Alphard 09:28:50.4 -08:46:13 2.0 5.39 31 8Gam Sex 09:53:46.2 -08:13:34 4.8 2.76 33 PPM 192759 09:49:23.2 -06:01:22 7.7 0.50 30 PPM 192719 09:47:41.9 -06:08:42 9.0 0.20 30 2920_Automedon 09:47:23.1 -05:57:35 14.6 30 Positions are for equinox of date
Star training set for 2920_Automedon, (2025/06/27 22:52UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 18.65 20 Alphard 09:27:35.2 -08:39:30 2.0 5.39 31 8Gam Sex 09:52:30.3 -08:06:19 4.8 2.76 33 PPM 192759 09:48:06.7 -05:54:13 7.7 0.50 30 PPM 192719 09:46:25.5 -06:01:35 9.0 0.20 30 2920_Automedon 09:46:06.7 -05:50:28 14.6 30 Positions are for J2000