RECON observing guide for 4707_Khryses_20250710091741

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

Azimuth is measured in degrees eastward from north. North is at an azimuth of 0, due East is at an azimuth of 90 degrees, due South is 180, and due West is 270.

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


Created by recondetail.pro, 2025/02/28 10:47:37 MT