Occultation event with (5638) Deikoon, event index number 1093
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/06/24 10:32:25 UTC
J2000 position of star is 01:44:36.4 +03:41:25
Equinox of date position of star is 01:45:55.8 +03:49:03
Star is 55 degrees from the moon. Moon is 2% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=16.6
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 3.5 per integration for unocculted signal
Expected flux drop is 69% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 23.7 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
The recommended exposure time corresponds to 10.7 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 15.5 km.
The sky-plane scale is 4236.5 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, aximum of 2.0 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 46.3 km used for deployment plan.
Star training set for 5638_Deikoon, (2025/06/24 10:32UT) Object RA Dec mag sep mel Aldebaran 04:37:23.1 +16:33:30 0.8 43.95 14 68Omi Cet 02:20:38.1 -02:51:48 2.0 10.95 52 106Nu Psc 01:42:45.6 +05:36:56 4.4 1.96 55 PPM 144956 01:47:03.2 +03:47:40 7.1 0.28 55 PPM 144923 01:45:11.3 +03:43:01 9.2 0.21 55 5638_Deikoon 01:45:55.8 +03:49:03 16.6 55 Positions are for equinox of date
Star training set for 5638_Deikoon, (2025/06/24 10:32UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 43.95 14 68Omi Cet 02:19:20.8 -02:58:46 2.0 10.95 52 106Nu Psc 01:41:25.9 +05:29:15 4.4 1.96 55 PPM 144956 01:45:43.9 +03:40:03 7.1 0.28 55 PPM 144923 01:43:52.0 +03:35:23 9.2 0.21 55 5638_Deikoon 01:44:36.4 +03:41:25 16.6 55 Positions are for J2000