Occultation event with (4707) Khryses, event index number 4236
Regions able to see the event: SAfrica
Geocentric closest approach at 2026/09/14 02:10:58 UTC
J2000 position of star is 06:27:09.3 +28:13:05
Equinox of date position of star is 06:28:50.4 +28:11:59
Star is 112 degrees from the moon. Moon is 10% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 83% with SNR of 7.9 for the occulted depth (per occulted point)
Apparent velocity is 20.4 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
Position angle of asteroid motion is 89.8 degrees
The recommended exposure time corresponds to 9.2 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 33.7 km.
The sky-plane scale is 3662.3 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 2.1 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/09/14 02:11UT) Object RA Dec mag sep mel Pollux 07:46:56.8 +27:57:34 1.1 17.21 95 Alhena 06:39:15.2 +16:22:27 1.9 12.07 108 PPM 095923 06:26:35.1 +29:41:26 6.5 1.57 112 PPM 095925 06:26:40.4 +28:00:55 8.1 0.51 112 PPM 095932 06:26:55.8 +28:09:36 9.7 0.42 112 PPM 095985 06:28:53.8 +28:06:01 10.2 0.10 112 4707_Khryses 06:28:50.4 +28:11:59 16.2 111 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/09/14 02:11UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 17.21 95 Alhena 06:37:42.8 +16:23:56 1.9 12.07 108 PPM 095923 06:24:52.7 +29:42:25 6.5 1.57 112 PPM 095925 06:24:59.4 +28:01:55 8.1 0.51 112 PPM 095932 06:25:14.7 +28:10:36 9.7 0.42 112 PPM 095985 06:27:12.7 +28:07:06 10.2 0.10 112 4707_Khryses 06:27:09.3 +28:13:05 16.2 112 Positions are for J2000