Occultation event with (4707) Khryses, event index number 5123
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/12/09 01:28:24 UTC
J2000 position of star is 06:28:16.6 +28:39:28
Equinox of date position of star is 06:29:58.9 +28:38:20
Star is 161 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 35% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 15.2 km/sec on the sky relative to the star, or, 18.7 arcsec/hr.
Position angle of asteroid motion is 90.9 degrees
The recommended exposure time corresponds to 9.1 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 34.6 km.
The sky-plane scale is 2920.4 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 2.9 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/12/09 01:28UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 16.94 144 Alhena 06:39:16.1 +16:22:26 1.9 12.45 155 PPM 095923 06:26:36.0 +29:41:25 6.5 1.28 162 PPM 096061 06:31:21.9 +28:45:39 7.5 0.33 161 PPM 096019 06:29:46.3 +28:35:30 8.9 0.07 161 4707_Khryses 06:29:58.9 +28:38:20 15.4 161 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/12/09 01:28UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 16.94 144 Alhena 06:37:42.8 +16:23:56 1.9 12.45 155 PPM 095923 06:24:52.7 +29:42:25 6.5 1.28 162 PPM 096061 06:29:39.5 +28:46:50 7.5 0.33 161 PPM 096019 06:28:04.0 +28:36:38 8.9 0.07 161 4707_Khryses 06:28:16.6 +28:39:28 15.4 161 Positions are for J2000