Occultation event with (4707) Khryses, event index number 4154
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/09/02 09:29:28 UTC
J2000 position of star is 06:19:19.8 +28:12:49
Equinox of date position of star is 06:21:00.9 +28:12:02
Star is 49 degrees from the moon. Moon is 71% illuminated.
Stellar brightness G=13.9, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.20 seconds with the standard RECON-QHY system.
SNR of 8.5 per integration for unocculted signal
Expected flux drop is 90% with SNR of 7.6 for the occulted depth (per occulted point)
Apparent velocity is 25.2 km/sec on the sky relative to the star, or, 24.0 arcsec/hr.
Position angle of asteroid motion is 89.9 degrees
The recommended exposure time corresponds to 5.0 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 35.3 km.
The sky-plane scale is 3778.3 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 1.7 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/09/02 09:29UT) Object RA Dec mag sep mel Pollux 07:46:56.7 +27:57:34 1.1 18.93 68 Alnath 05:27:58.8 +28:37:39 1.6 11.66 38 PPM 095824 06:22:54.0 +29:31:34 6.3 1.39 50 PPM 095788 06:21:40.2 +28:24:47 7.5 0.26 50 PPM 095764 06:20:56.7 +28:25:36 9.4 0.23 49 4707_Khryses 06:21:00.9 +28:12:02 16.2 50 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/09/02 09:29UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 18.93 68 Alnath 05:26:17.6 +28:36:22 1.6 11.66 38 PPM 095824 06:21:11.9 +29:32:26 6.3 1.39 50 PPM 095788 06:19:59.0 +28:25:35 7.5 0.26 50 PPM 095764 06:19:15.5 +28:26:23 9.4 0.23 49 4707_Khryses 06:19:19.8 +28:12:49 16.2 49 Positions are for J2000