Occultation event with (4707) Khryses, event index number 4333
Regions able to see the event: Europe
Geocentric closest approach at 2026/10/01 00:02:52 UTC
J2000 position of star is 06:35:44.9 +28:14:24
Equinox of date position of star is 06:37:26.1 +28:12:59
Star is 34 degrees from the moon. Moon is 78% illuminated.
Stellar brightness G=14.3, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 9.7 per integration for unocculted signal
Expected flux drop is 83% with SNR of 8.1 for the occulted depth (per occulted point)
Apparent velocity is 12.9 km/sec on the sky relative to the star, or, 13.3 arcsec/hr.
Position angle of asteroid motion is 88.4 degrees
The recommended exposure time corresponds to 5.1 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 34.3 km.
The sky-plane scale is 3485.0 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 3.4 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 1.4 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/10/01 00:03UT) Object RA Dec mag sep mel Pollux 07:46:57.0 +27:57:34 1.1 15.32 49 Alhena 06:39:15.4 +16:22:27 1.9 11.85 37 49 Aur 06:36:53.1 +27:59:56 5.0 0.25 34 PPM 096162 06:35:22.5 +27:57:28 8.5 0.52 33 PPM 096217 06:36:56.9 +28:25:10 8.9 0.23 34 PPM 096227 06:37:25.5 +28:00:54 10.6 0.20 34 4707_Khryses 06:37:26.1 +28:12:59 16.1 34 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/10/01 00:03UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 15.32 49 Alhena 06:37:42.8 +16:23:56 1.9 11.85 37 49 Aur 06:35:12.1 +28:01:20 5.0 0.25 34 PPM 096162 06:33:41.5 +27:58:48 8.5 0.52 33 PPM 096217 06:35:15.6 +28:26:34 8.9 0.23 34 PPM 096227 06:35:44.4 +28:02:19 10.6 0.20 34 4707_Khryses 06:35:44.9 +28:14:24 16.1 34 Positions are for J2000