Occultation event with (4707) Khryses, event index number 4211
Regions able to see the event: Europe
Geocentric closest approach at 2026/09/10 03:23:43 UTC
J2000 position of star is 06:24:40.2 +28:12:56
Equinox of date position of star is 06:26:21.3 +28:11:57
Star is 59 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.40 seconds with the standard RECON-QHY system.
SNR of 3.8 per integration for unocculted signal
Expected flux drop is 65% with SNR of 2.5 for the occulted depth (per occulted point)
Apparent velocity is 22.1 km/sec on the sky relative to the star, or, 21.5 arcsec/hr.
Position angle of asteroid motion is 89.9 degrees
The recommended exposure time corresponds to 8.8 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 34.3 km.
The sky-plane scale is 3702.3 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/09/10 03:24UT) Object RA Dec mag sep mel Pollux 07:46:56.8 +27:57:34 1.1 17.76 42 Alhena 06:39:15.2 +16:22:27 1.9 12.19 56 PPM 095923 06:26:35.0 +29:41:26 6.5 1.49 59 PPM 095925 06:26:40.4 +28:00:55 8.1 0.20 59 PPM 095932 06:26:55.8 +28:09:36 9.7 0.13 59 4707_Khryses 06:26:21.3 +28:11:57 16.2 59 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/09/10 03:24UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 17.76 42 Alhena 06:37:42.8 +16:23:56 1.9 12.19 56 PPM 095923 06:24:52.7 +29:42:25 6.5 1.49 59 PPM 095925 06:24:59.4 +28:01:55 8.1 0.20 59 PPM 095932 06:25:14.7 +28:10:36 9.7 0.13 59 4707_Khryses 06:24:40.2 +28:12:56 16.2 59 Positions are for J2000