Occultation event with (4707) Khryses, event index number 1123
Regions able to see the event: SAmericaN,SAmericaS
Geocentric closest approach at 2025/07/10 09:17:41 UTC
J2000 position of star is 03:10:42.8 +24:25:48
Equinox of date position of star is 03:12:12.8 +24:31:31
Star is 129 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=15.1, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.35 seconds with the standard RECON-QHY system.
SNR of 4.8 per integration for unocculted signal
Expected flux drop is 70% with SNR of 3.4 for the occulted depth (per occulted point)
Apparent velocity is 30.6 km/sec on the sky relative to the star, or, 29.9 arcsec/hr.
The recommended exposure time corresponds to 10.7 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 18.8 km.
The sky-plane scale is 3690.4 km/arcsec.
Diameter estimates:
43.8 km assuming a 5% albedo, aximum of 1.4 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.6 sec for a central chord
Cross-track diameter of 43.8 km used for deployment plan.
Star training set for 4707_Khryses, (2025/07/10 09:18UT) Object RA Dec mag sep mel Aldebaran 04:37:23.3 +16:33:31 0.8 21.44 146 44Zet Per 03:55:44.6 +31:57:26 2.8 12.12 140 52 Ari 03:06:56.9 +25:21:10 6.1 1.45 128 PPM 092225 03:09:21.8 +23:47:03 8.1 0.99 129 PPM 092255 03:11:38.1 +24:45:32 9.8 0.27 129 PPM 092270 03:12:34.8 +24:40:24 10.4 0.17 129 4707_Khryses 03:12:12.8 +24:31:31 16.0 130 Positions are for equinox of date
Star training set for 4707_Khryses, (2025/07/10 09:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 21.44 146 44Zet Per 03:54:07.9 +31:53:01 2.8 12.12 140 52 Ari 03:05:26.7 +25:15:19 6.1 1.45 128 PPM 092225 03:07:52.3 +23:41:16 8.1 0.99 129 PPM 092255 03:10:08.0 +24:39:48 9.8 0.27 129 PPM 092270 03:11:04.7 +24:34:41 10.4 0.17 129 4707_Khryses 03:10:42.8 +24:25:48 16.0 129 Positions are for J2000