Occultation event with (5285) Krethon, event index number 886
Regions able to see the event: Australia
Geocentric closest approach at 2025/04/05 13:14:58 UTC
J2000 position of star is 11:32:05.2 +18:48:13
Equinox of date position of star is 11:33:24.2 +18:39:50
Star is 54 degrees from the moon. Moon is 55% illuminated.
Stellar brightness G=14.1, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.30 seconds with the standard RECON-QHY system.
Expected flux drop is 24% with SNR of 9.2 per integration
Apparent velocity is 14.6 km/sec on the sky relative to the star, or, 16.1 arcsec/hr.
The recommended exposure time corresponds to 4.4 km per image.
The 1-sigma error in the time of the event is 3.2 seconds.
The 1-sigma cross-track error in the shadow position is 15.3 km.
The sky-plane scale is 3257.4 km/arcsec.
Diameter estimates:
56.0 km assuming a 5% albedo, aximum of 3.8 sec for a central chord
22.9 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 56.0 km used for deployment plan.
Star training set for 5285_Krethon, (2025/04/05 13:15UT) Object RA Dec mag sep mel Regulus 10:09:42.9 +11:50:34 1.3 21.29 38 68Del Leo 11:15:26.9 +20:23:06 2.6 4.57 50 86 Leo 11:31:47.9 +18:16:13 6.3 0.55 54 PPM 128342 11:34:31.6 +18:40:54 8.2 0.27 55 5285_Krethon 11:33:24.2 +18:39:50 15.3 55 Positions are for equinox of date
Star training set for 5285_Krethon, (2025/04/05 13:15UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 21.29 38 68Del Leo 11:14:06.7 +20:31:22 2.6 4.57 50 86 Leo 11:30:28.8 +18:24:35 6.3 0.55 54 PPM 128342 11:33:12.6 +18:49:17 8.2 0.27 55 5285_Krethon 11:32:05.2 +18:48:13 15.3 54 Positions are for J2000