Occultation event with (15539) 00CN3, event index number 902
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/04/14 23:09:44 UTC
J2000 position of star is 06:57:24.9 +25:41:54
Equinox of date position of star is 06:58:58.3 +25:39:47
Star is 124 degrees from the moon. Moon is 97% illuminated.
Stellar brightness G=16.7, apparent brightess of occulting body is G=16.1
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 36% with SNR of 1.1 for the occulted depth (per occulted point)
Apparent velocity is 18.1 km/sec on the sky relative to the star, or, 17.4 arcsec/hr.
The recommended exposure time corresponds to 23.5 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 19.9 km.
The sky-plane scale is 3739.1 km/arcsec.
Diameter estimates:
47.9 km assuming a 5% albedo, aximum of 2.7 sec for a central chord
19.5 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 47.9 km used for deployment plan.
Star training set for 15539_00CN3, (2025/04/14 23:10UT) Object RA Dec mag sep mel Pollux 07:46:51.6 +27:57:47 1.1 10.92 113 Alhena 06:39:10.3 +16:22:32 1.9 10.37 126 39 Gem 07:00:20.8 +26:02:44 6.5 0.49 123 PPM 096792 06:58:43.9 +25:32:54 9.5 0.13 124 PPM 096806 06:59:08.6 +25:34:30 11.1 0.10 124 15539_00CN3 06:58:58.3 +25:39:47 16.1 123 Positions are for equinox of date
Star training set for 15539_00CN3, (2025/04/14 23:10UT) Object RA Dec mag sep mel Pollux 07:45:17.8 +28:01:33 1.1 10.92 113 Alhena 06:37:42.8 +16:23:56 1.9 10.37 126 39 Gem 06:58:47.1 +26:04:54 6.5 0.49 123 PPM 096792 06:57:10.5 +25:35:01 9.5 0.13 124 PPM 096806 06:57:35.2 +25:36:38 11.1 0.10 124 15539_00CN3 06:57:24.9 +25:41:54 16.1 124 Positions are for J2000