Occultation event with (5638) Deikoon, event index number 3192
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2026/02/01 00:46:21 UTC
J2000 position of star is 01:34:35.7 +00:33:40
Equinox of date position of star is 01:35:56.0 +00:41:39
Star is 99 degrees from the moon. Moon is 99% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.6
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.0 per integration for unocculted signal
Expected flux drop is 61% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 22.0 km/sec on the sky relative to the star, or, 18.5 arcsec/hr.
Position angle of asteroid motion is 61.3 degrees
The recommended exposure time corresponds to 13.2 km per image.
The 1-sigma error in the time of the event is 0.9 seconds.
The 1-sigma cross-track error in the shadow position is 22.3 km.
The sky-plane scale is 4282.9 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 41.5 km used for deployment plan.
Star training set for 5638_Deikoon, (2026/02/01 00:46UT) Object RA Dec mag sep mel Fomalhaut 22:59:05.2 -29:29:00 1.2 48.05 143 68Omi Cet 02:20:40.0 -02:51:38 2.0 11.73 90 PPM 144619 01:28:14.7 +03:40:11 6.5 3.54 99 PPM 144766 01:36:09.7 +01:04:31 7.0 0.39 98 PPM 144762 01:35:55.2 +00:21:55 9.1 0.33 99 PPM 144738 01:34:54.2 +00:35:45 10.3 0.28 99 5638_Deikoon 01:35:56.0 +00:41:39 16.6 98 Positions are for equinox of date
Star training set for 5638_Deikoon, (2026/02/01 00:46UT) Object RA Dec mag sep mel Fomalhaut 22:57:39.7 -29:37:24 1.2 48.05 143 68Omi Cet 02:19:20.8 -02:58:46 2.0 11.73 90 PPM 144619 01:26:53.6 +03:32:06 6.5 3.54 99 PPM 144766 01:34:49.2 +00:56:33 7.0 0.39 98 PPM 144762 01:34:34.9 +00:13:56 9.1 0.33 99 PPM 144738 01:33:33.8 +00:27:46 10.3 0.28 99 5638_Deikoon 01:34:35.7 +00:33:40 16.6 99 Positions are for J2000