RECON observing guide for 4707_Khryses_20250728021343

Occultation event with (4707) Khryses, event index number 1174
Regions able to see the event: SAfrica

Geocentric closest approach at 2025/07/28 02:13:43 UTC

J2000 position of star is 03:24:06.7 +25:34:00
Equinox of date position of star is 03:25:38.1 +25:39:21
Star is 110 degrees from the moon. Moon is 12% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=16.0
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 52% with SNR of 1.6 for the occulted depth (per occulted point)

Apparent velocity is 24.3 km/sec on the sky relative to the star, or, 24.8 arcsec/hr.
The recommended exposure time corresponds to 12.1 km per image.
The 1-sigma error in the time of the event is 1.9 seconds.
The 1-sigma cross-track error in the shadow position is 18.3 km.
The sky-plane scale is 3524.5 km/arcsec.

Diameter estimates:
43.8 km assuming a 5% albedo, aximum of 1.8 sec for a central chord
17.9 km assuming a 30% albedo, maximum of 0.7 sec for a central chord
Cross-track diameter of 43.8 km used for deployment plan.

Star training set for 4707_Khryses, (2025/07/28 02:14UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:37:23.5 +16:33:31  0.8 19.02  96
44Zet Per      03:55:44.8 +31:57:27  2.8  9.12 102
64 Ari         03:25:49.4 +24:48:46  5.5  0.84 111
60 Ari         03:21:56.9 +25:45:11  7.4  0.84 111
PPM 092462     03:25:03.9 +25:59:20  9.8  0.36 110
PPM 092464     03:25:15.9 +25:31:08 10.8  0.16 110
4707_Khryses   03:25:38.1 +25:39:21 16.0       110
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, (2025/07/28 02:14UT)
Object            RA         Dec     mag  sep  mel
Aldebaran      04:35:55.4 +16:30:29  0.8 19.02  96
44Zet Per      03:54:07.9 +31:53:01  2.8  9.12 102
64 Ari         03:24:18.5 +24:43:25  5.5  0.84 111
60 Ari         03:20:25.6 +25:39:44  7.4  0.84 111
PPM 092462     03:23:32.4 +25:53:58  9.8  0.36 110
PPM 092464     03:23:44.6 +25:25:46 10.8  0.16 110
4707_Khryses   03:24:06.7 +25:34:00 16.0       110
Positions are for J2000


Created by recondetail.pro, 2025/03/01 09:03:39 MT