Occultation event with (4707) Khryses, event index number 1605
Regions able to see the event: Europe
Geocentric closest approach at 2025/11/28 18:11:55 UTC
J2000 position of star is 03:13:53.4 +26:53:40
Equinox of date position of star is 03:15:26.2 +26:59:23
Star is 71 degrees from the moon. Moon is 55% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.0
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 28% with SNR of 0.9 for the occulted depth (per occulted point)
Apparent velocity is 15.0 km/sec on the sky relative to the star, or, 20.0 arcsec/hr.
Position angle of asteroid motion is 68.8 degrees
The recommended exposure time corresponds to 9.7 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 28.6 km.
The sky-plane scale is 2694.5 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, aximum of 2.9 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 1.2 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2025/11/28 18:12UT) Object RA Dec mag sep mel Aldebaran 04:37:24.6 +16:33:33 0.8 21.66 87 44Zet Per 03:55:46.0 +31:57:30 2.8 10.08 81 56 Ari 03:13:47.2 +27:21:10 5.6 0.52 71 PPM 092324 03:17:07.6 +26:59:51 8.1 0.38 71 4707_Khryses 03:15:26.2 +26:59:23 15.0 71 Positions are for equinox of date
Star training set for 4707_Khryses, (2025/11/28 18:12UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.66 87 44Zet Per 03:54:07.9 +31:53:01 2.8 10.08 81 56 Ari 03:12:14.2 +27:15:25 5.6 0.52 71 PPM 092324 03:15:34.7 +26:54:11 8.1 0.38 71 4707_Khryses 03:13:53.4 +26:53:40 15.0 71 Positions are for J2000