Occultation event with (5285) Krethon, event index number 3589
Regions able to see the event: Europe
Geocentric closest approach at 2026/04/06 23:21:48 UTC
J2000 position of star is 13:52:45.9 +15:53:04
Equinox of date position of star is 13:54:01.9 +15:45:21
Star is 59 degrees from the moon. Moon is 79% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=15.3
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 5.7 per integration for unocculted signal
Expected flux drop is 49% with SNR of 2.8 for the occulted depth (per occulted point)
Apparent velocity is 18.0 km/sec on the sky relative to the star, or, 19.7 arcsec/hr.
Position angle of asteroid motion is 125.3 degrees
The recommended exposure time corresponds to 11.7 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 25.3 km.
The sky-plane scale is 3280.4 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, (2026/04/06 23:22UT) Object RA Dec mag sep mel Arcturus 14:16:51.7 +19:02:50 0.0 6.36 58 Vindemiatrix 13:03:29.1 +10:49:07 2.8 13.25 65 5Ups Boo 13:50:44.6 +15:40:07 5.6 0.80 59 PPM 130140 13:53:48.4 +16:36:00 7.6 0.85 60 PPM 130167 13:56:00.6 +15:08:57 8.9 0.77 58 PPM 130138 13:53:34.6 +15:28:25 10.4 0.30 59 5285_Krethon 13:54:01.9 +15:45:21 15.3 59 Positions are for equinox of date
Star training set for 5285_Krethon, (2026/04/06 23:22UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 6.36 58 Vindemiatrix 13:02:10.1 +10:57:33 2.8 13.25 65 5Ups Boo 13:49:28.4 +15:47:54 5.6 0.80 59 PPM 130140 13:52:32.6 +16:43:44 7.6 0.85 60 PPM 130167 13:54:44.4 +15:16:38 8.9 0.77 58 PPM 130138 13:52:18.5 +15:36:09 10.4 0.30 59 5285_Krethon 13:52:45.9 +15:53:04 15.3 59 Positions are for J2000