Occultation event with (4707) Khryses, event index number 3213
Regions able to see the event: Australia
Geocentric closest approach at 2026/02/05 13:20:41 UTC
J2000 position of star is 03:06:09.8 +24:32:29
Equinox of date position of star is 03:07:41.7 +24:38:27
Star is 131 degrees from the moon. Moon is 85% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.75 seconds with the standard RECON-QHY system.
SNR of 4.3 per integration for unocculted signal
Expected flux drop is 50% with SNR of 2.2 for the occulted depth (per occulted point)
Apparent velocity is 12.2 km/sec on the sky relative to the star, or, 13.3 arcsec/hr.
Position angle of asteroid motion is 92.7 degrees
The recommended exposure time corresponds to 9.1 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 33.7 km.
The sky-plane scale is 3288.8 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, maximum of 3.6 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 37.8 km used for deployment plan.
Star training set for 4707_Khryses, (2026/02/05 13:21UT) Object RA Dec mag sep mel Aldebaran 04:37:25.3 +16:33:35 0.8 22.46 112 44Zet Per 03:55:46.8 +31:57:32 2.8 12.85 119 52 Ari 03:06:58.9 +25:21:18 6.1 0.73 131 PPM 092211 03:07:52.8 +24:22:17 8.7 0.27 131 4707_Khryses 03:07:41.7 +24:38:27 15.9 131 Positions are for equinox of date
Star training set for 4707_Khryses, (2026/02/05 13:21UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 22.46 112 44Zet Per 03:54:07.9 +31:53:01 2.8 12.85 119 52 Ari 03:05:26.7 +25:15:19 6.1 0.73 131 PPM 092211 03:06:21.0 +24:16:19 8.7 0.27 131 4707_Khryses 03:06:09.8 +24:32:29 15.9 131 Positions are for J2000