Occultation event with (5285) Krethon, event index number 3610
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/10 17:11:37 UTC
J2000 position of star is 13:51:04.1 +16:09:33
Equinox of date position of star is 13:52:20.1 +16:01:48
Star is 98 degrees from the moon. Moon is 45% illuminated.
Stellar brightness G=13.1, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 10.1 per integration for unocculted signal
Expected flux drop is 88% with SNR of 8.9 for the occulted depth (per occulted point)
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 122.6 degrees
The recommended exposure time corresponds to 2.1 km per image.
The 1-sigma error in the time of the event is 1.3 seconds.
The 1-sigma cross-track error in the shadow position is 26.4 km.
The sky-plane scale is 3279.8 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 3.2 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 1.3 sec for a central chord
Cross-track diameter of 49.6 km used for deployment plan.
Star training set for 5285_Krethon, (2026/04/10 17:12UT) Object RA Dec mag sep mel Arcturus 14:16:51.7 +19:02:50 0.0 6.58 94 Vindemiatrix 13:03:29.1 +10:49:06 2.8 12.97 107 5Ups Boo 13:50:44.6 +15:40:07 5.6 0.53 98 PPM 130140 13:53:48.5 +16:36:00 7.6 0.67 98 5Ups Boo 13:50:44.6 +15:40:07 5.6 0.53 98 PPM 130119 13:52:07.6 +16:07:29 10.4 0.11 98 5285_Krethon 13:52:20.1 +16:01:48 15.3 98 Positions are for equinox of date
Star training set for 5285_Krethon, (2026/04/10 17:12UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 6.58 94 Vindemiatrix 13:02:10.1 +10:57:33 2.8 12.97 107 5Ups Boo 13:49:28.4 +15:47:54 5.6 0.53 98 PPM 130140 13:52:32.6 +16:43:44 7.6 0.67 98 5Ups Boo 13:49:28.4 +15:47:54 5.6 0.53 98 PPM 130119 13:50:51.5 +16:15:14 10.4 0.11 98 5285_Krethon 13:51:04.1 +16:09:33 15.3 98 Positions are for J2000