Occultation event with (4707) Khryses, event index number 3530
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/28 19:47:12 UTC
J2000 position of star is 03:40:33.6 +25:20:10
Equinox of date position of star is 03:42:08.0 +25:25:09
Star is 78 degrees from the moon. Moon is 81% illuminated.
Stellar brightness G=14.9, apparent brightess of occulting body is G=16.1
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 75% with SNR of 3.2 for the occulted depth (per occulted point)
Apparent velocity is 32.7 km/sec on the sky relative to the star, or, 30.6 arcsec/hr.
Position angle of asteroid motion is 81.8 degrees
The recommended exposure time corresponds to 8.2 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 33.0 km.
The sky-plane scale is 3853.6 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, (2026/03/28 19:47UT) Object RA Dec mag sep mel Aldebaran 04:37:25.8 +16:33:36 0.8 15.64 67 44Zet Per 03:55:47.3 +31:57:34 2.8 7.19 74 11 Tau 03:42:20.7 +25:24:45 6.1 0.05 78 4707_Khryses 03:42:08.0 +25:25:09 16.1 78 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/03/28 19:47UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 15.64 67 44Zet Per 03:54:07.9 +31:53:01 2.8 7.19 74 11 Tau 03:40:46.3 +25:19:46 6.1 0.05 78 4707_Khryses 03:40:33.6 +25:20:10 16.1 78 Positions are for J2000