Occultation event with (5285) Krethon, event index number 3829
Regions able to see the event: Europe
Geocentric closest approach at 2026/07/04 22:25:30 UTC
J2000 position of star is 13:30:39.0 +15:28:28
Equinox of date position of star is 13:31:56.8 +15:20:19
Star is 137 degrees from the moon. Moon is 79% illuminated.
Stellar brightness G=15.9, apparent brightess of occulting body is G=15.9
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 4.7 per integration for unocculted signal
Expected flux drop is 50% with SNR of 2.4 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 12.5 arcsec/hr.
Position angle of asteroid motion is 150.6 degrees
The recommended exposure time corresponds to 12.0 km per image.
The 1-sigma error in the time of the event is 2.4 seconds.
The 1-sigma cross-track error in the shadow position is 13.2 km.
The sky-plane scale is 3859.3 km/arcsec.
Diameter estimates:
56.8 km assuming a 5% albedo, maximum of 4.2 sec for a central chord
23.2 km assuming a 30% albedo, maximum of 1.7 sec for a central chord
Cross-track diameter of 49.6 km used for deployment plan.
Star training set for 5285_Krethon, (2026/07/04 22:26UT) Object RA Dec mag sep mel Arcturus 14:16:52.4 +19:02:46 0.0 11.35 126 Vindemiatrix 13:03:29.8 +10:49:02 2.8 8.27 144 70 Vir 13:29:43.6 +13:38:17 5.0 1.78 138 PPM 129844 13:29:44.3 +15:34:19 7.6 0.58 138 PPM 129867 13:31:23.2 +15:10:43 8.6 0.21 137 5285_Krethon 13:31:56.8 +15:20:19 15.9 137 Positions are for equinox of date
Star training set for 5285_Krethon, (2026/07/04 22:26UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 11.35 126 Vindemiatrix 13:02:10.1 +10:57:33 2.8 8.27 144 70 Vir 13:28:25.4 +13:46:29 5.0 1.78 138 PPM 129844 13:28:26.5 +15:42:30 7.6 0.58 138 PPM 129867 13:30:05.4 +15:18:53 8.6 0.21 137 5285_Krethon 13:30:39.0 +15:28:28 15.9 137 Positions are for J2000