Occultation event with (5638) Deikoon, event index number 5023
Regions able to see the event: NMexico
Geocentric closest approach at 2026/12/04 07:57:09 UTC
J2000 position of star is 03:20:19.9 +05:17:52
Equinox of date position of star is 03:21:45.3 +05:23:37
Star is 146 degrees from the moon. Moon is 20% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 4.7 per integration for unocculted signal
Expected flux drop is 60% with SNR of 2.8 for the occulted depth (per occulted point)
Apparent velocity is 16.2 km/sec on the sky relative to the star, or, 16.5 arcsec/hr.
Position angle of asteroid motion is 81.7 degrees
The recommended exposure time corresponds to 9.7 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 29.8 km.
The sky-plane scale is 3521.4 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, maximum of 2.9 sec for a central chord
18.9 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 41.5 km used for deployment plan.
Star training set for 5638_Deikoon, (2026/12/04 07:57UT) Object RA Dec mag sep mel Aldebaran 04:37:28.1 +16:33:40 0.8 21.65 129 Menkar 03:03:41.4 +04:11:37 2.5 4.66 150 97Kap2Cet 03:22:31.5 +03:46:15 6.2 1.63 145 PPM 146427 03:19:31.6 +05:03:59 8.0 0.64 146 PPM 146498 03:23:18.9 +05:47:40 9.7 0.56 146 PPM 146457 03:21:11.5 +05:17:55 10.1 0.17 146 5638_Deikoon 03:21:45.3 +05:23:37 16.0 146 Positions are for equinox of date
Star training set for 5638_Deikoon, (2026/12/04 07:57UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.65 129 Menkar 03:02:16.8 +04:05:21 2.5 4.66 150 97Kap2Cet 03:21:06.9 +03:40:31 6.2 1.63 145 PPM 146427 03:18:06.4 +04:58:10 8.0 0.64 146 PPM 146498 03:21:53.3 +05:41:58 9.7 0.56 146 PPM 146457 03:19:46.2 +05:12:09 10.1 0.17 146 5638_Deikoon 03:20:19.9 +05:17:52 16.0 146 Positions are for J2000