Occultation event with (4836) Medon, event index number 3767
Regions able to see the event: NZ,SMexico
Geocentric closest approach at 2026/05/29 07:13:11 UTC
J2000 position of star is 13:21:47.9 +12:05:30
Equinox of date position of star is 13:23:06.5 +11:57:15
Star is 39 degrees from the moon. Moon is 96% illuminated.
Stellar brightness G=11.9, apparent brightess of occulting body is G=14.8
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 21.9 per integration for unocculted signal
Expected flux drop is 93% with SNR of 20.4 for the occulted depth (per occulted point)
Apparent velocity is 10.4 km/sec on the sky relative to the star, or, 11.5 arcsec/hr.
Position angle of asteroid motion is 49.1 degrees
The recommended exposure time corresponds to 1.2 km per image.
The 1-sigma error in the time of the event is 0.7 seconds.
The 1-sigma cross-track error in the shadow position is 36.1 km.
The sky-plane scale is 3246.3 km/arcsec.
Diameter estimates:
74.1 km assuming a 5% albedo, maximum of 7.1 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 2.9 sec for a central chord
Cross-track diameter of 63.3 km used for deployment plan.
Star training set for 4836_Medon, (2026/05/29 07:13UT) Object RA Dec mag sep mel Arcturus 14:16:52.1 +19:02:47 0.0 14.76 41 Vindemiatrix 13:03:29.5 +10:49:04 2.8 4.94 41 PPM 129714 13:18:34.0 +13:32:14 6.2 1.93 41 PPM 129797 13:25:48.9 +12:17:42 7.1 0.74 39 PPM 129747 13:21:49.6 +12:06:39 9.9 0.35 39 PPM 129756 13:22:51.3 +11:41:52 10.3 0.26 39 4836_Medon 13:23:06.5 +11:57:15 14.8 39 Positions are for equinox of date
Star training set for 4836_Medon, (2026/05/29 07:13UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 14.76 41 Vindemiatrix 13:02:10.1 +10:57:33 2.8 4.94 41 PPM 129714 13:17:15.7 +13:40:33 6.2 1.93 41 PPM 129797 13:24:30.5 +12:25:56 7.1 0.74 39 PPM 129747 13:20:31.0 +12:14:56 9.9 0.35 39 PPM 129756 13:21:32.7 +11:50:08 10.3 0.26 39 4836_Medon 13:21:47.9 +12:05:30 14.8 39 Positions are for J2000