Occultation event with (5638) Deikoon, event index number 5102
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/12/07 20:31:53 UTC
J2000 position of star is 03:18:49.5 +05:14:57
Equinox of date position of star is 03:20:14.9 +05:20:45
Star is 158 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 49% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 15.4 km/sec on the sky relative to the star, or, 15.6 arcsec/hr.
Position angle of asteroid motion is 83.4 degrees
The recommended exposure time corresponds to 10.0 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 30.1 km.
The sky-plane scale is 3539.2 km/arcsec.
Diameter estimates:
46.3 km assuming a 5% albedo, maximum of 3.0 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, (2026/12/07 20:32UT) Object RA Dec mag sep mel Aldebaran 04:37:28.2 +16:33:40 0.8 21.99 167 Menkar 03:03:41.4 +04:11:38 2.5 4.28 155 97Kap2Cet 03:22:31.5 +03:46:15 6.2 1.67 156 PPM 146427 03:19:31.6 +05:03:59 8.0 0.33 157 PPM 146424 03:19:18.3 +05:14:45 9.8 0.26 157 PPM 146457 03:21:11.5 +05:17:55 10.1 0.24 158 5638_Deikoon 03:20:14.9 +05:20:45 16.0 158 Positions are for equinox of date
Star training set for 5638_Deikoon, (2026/12/07 20:32UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.99 167 Menkar 03:02:16.8 +04:05:21 2.5 4.28 155 97Kap2Cet 03:21:06.9 +03:40:31 6.2 1.67 156 PPM 146427 03:18:06.4 +04:58:10 8.0 0.33 157 PPM 146424 03:17:53.0 +05:08:56 9.8 0.26 157 PPM 146457 03:19:46.2 +05:12:09 10.1 0.24 158 5638_Deikoon 03:18:49.5 +05:14:57 16.0 158 Positions are for J2000