Occultation event with (4707) Khryses, event index number 4092
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/24 10:05:14 UTC
J2000 position of star is 06:12:26.9 +28:12:30
Equinox of date position of star is 06:14:07.9 +28:11:59
Star is 164 degrees from the moon. Moon is 87% illuminated.
Stellar brightness G=16.1, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 52% with SNR of 1.7 for the occulted depth (per occulted point)
Apparent velocity is 28.5 km/sec on the sky relative to the star, or, 26.6 arcsec/hr.
Position angle of asteroid motion is 89.7 degrees
The recommended exposure time corresponds to 18.5 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 34.5 km.
The sky-plane scale is 3861.2 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 1.5 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/08/24 10:05UT) Object RA Dec mag sep mel Pollux 07:46:56.6 +27:57:35 1.1 20.44 174 Alnath 05:27:58.7 +28:37:39 1.6 10.15 154 44Kap Aur 06:17:04.6 +29:29:08 4.3 1.44 165 PPM 095567 06:12:56.4 +28:53:58 8.0 0.75 164 PPM 095637 06:16:03.9 +28:01:07 9.3 0.46 165 PPM 095628 06:15:29.3 +28:25:09 11.0 0.37 165 4707_Khryses 06:14:07.9 +28:11:59 16.2 165 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/08/24 10:05UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 20.44 174 Alnath 05:26:17.6 +28:36:22 1.6 10.15 154 44Kap Aur 06:15:22.5 +29:29:46 4.3 1.44 165 PPM 095567 06:11:14.8 +28:54:26 8.0 0.75 164 PPM 095637 06:14:23.0 +28:01:43 9.3 0.46 165 PPM 095628 06:13:48.1 +28:25:43 11.0 0.37 165 4707_Khryses 06:12:26.9 +28:12:30 16.2 164 Positions are for J2000