Occultation event with (5123) Cynus, event index number 759
Regions able to see the event: Australia
Geocentric closest approach at 2025/03/05 13:22:59 UTC
J2000 position of star is 09:06:38.5 +26:00:52
Equinox of date position of star is 09:08:07.1 +25:54:44
Star is 70 degrees from the moon. Moon is 37% illuminated.
Stellar brightness G=15.5, apparent brightess of occulting body is G=14.8
Use an exposure time of 1.25 seconds with the standard RECON-QHY system.
Expected flux drop is 67% with SNR of 7.1 per integration
Apparent velocity is 11.1 km/sec on the sky relative to the star, or, 14.3 arcsec/hr.
The recommended exposure time corresponds to 13.9 km per image.
The 1-sigma error in the time of the event is 4.2 seconds.
The 1-sigma cross-track error in the shadow position is 9.8 km.
The sky-plane scale is 2812.1 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, aximum of 5.1 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 2.1 sec for a central chord
Cross-track diameter of 56.8 km used for deployment plan.
Star training set for 5123_Cynus, (2025/03/05 13:23UT) Object RA Dec mag sep mel Pollux 07:46:51.2 +27:57:48 1.1 18.21 52 69Nu Cnc 09:04:12.3 +24:21:08 5.4 1.79 70 PPM 099329 09:09:21.5 +25:31:25 7.1 0.48 71 PPM 099307 09:07:41.0 +26:01:43 9.2 0.15 70 5123_Cynus 09:08:07.1 +25:54:44 14.8 71 Positions are for equinox of date
Star training set for 5123_Cynus, (2025/03/05 13:23UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 18.21 52 69Nu Cnc 09:02:44.2 +24:27:10 5.4 1.79 70 PPM 099329 09:07:53.1 +25:37:35 7.1 0.48 71 PPM 099307 09:06:12.3 +26:07:50 9.2 0.15 70 5123_Cynus 09:06:38.5 +26:00:52 14.8 70 Positions are for J2000