Occultation event with (4707) Khryses, event index number 3966
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/09 08:53:07 UTC
J2000 position of star is 05:59:28.6 +28:10:46
Equinox of date position of star is 06:01:09.4 +28:10:45
Star is 1 degrees from the moon. Moon is 16% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=16.2
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 3.2 per integration for unocculted signal
Expected flux drop is 65% with SNR of 2.1 for the occulted depth (per occulted point)
Apparent velocity is 33.5 km/sec on the sky relative to the star, or, 30.2 arcsec/hr.
Position angle of asteroid motion is 89.1 degrees
The recommended exposure time corresponds to 11.7 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 34.4 km.
The sky-plane scale is 3985.1 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 1.3 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.5 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/08/09 08:53UT) Object RA Dec mag sep mel Betelgeuse 05:56:36.8 +07:24:35 0.4 20.80 21 Alnath 05:27:58.6 +28:37:38 1.6 7.31 8 PPM 095226 06:02:40.8 +27:34:17 6.0 0.69 1 PPM 095207 06:01:45.8 +28:07:31 8.3 0.14 1 PPM 095199 06:01:21.5 +28:14:25 10.4 0.08 1 4707_Khryses 06:01:09.4 +28:10:45 16.2 0 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/08/09 08:53UT) Object RA Dec mag sep mel Betelgeuse 05:55:10.3 +07:24:26 0.4 20.80 21 Alnath 05:26:17.6 +28:36:22 1.6 7.31 8 PPM 095226 06:01:00.4 +27:34:21 6.0 0.69 1 PPM 095207 06:00:05.0 +28:07:33 8.3 0.14 1 PPM 095199 05:59:40.6 +28:14:27 10.4 0.08 1 4707_Khryses 05:59:28.6 +28:10:46 16.2 1 Positions are for J2000