Occultation event with (4836) Medon, event index number 3430
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/15 00:22:09 UTC
J2000 position of star is 13:55:22.8 +11:07:36
Equinox of date position of star is 13:56:40.0 +10:59:56
Star is 102 degrees from the moon. Moon is 18% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=14.5
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
SNR of 5.8 per integration for unocculted signal
Expected flux drop is 26% with SNR of 1.5 for the occulted depth (per occulted point)
Apparent velocity is 13.4 km/sec on the sky relative to the star, or, 15.8 arcsec/hr.
Position angle of asteroid motion is 124.7 degrees
The recommended exposure time corresponds to 15.4 km per image.
The 1-sigma error in the time of the event is 2.5 seconds.
The 1-sigma cross-track error in the shadow position is 14.4 km.
The sky-plane scale is 3051.2 km/arcsec.
Diameter estimates:
74.1 km assuming a 5% albedo, maximum of 5.5 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 63.3 km used for deployment plan.
Star training set for 4836_Medon, (2026/03/15 00:22UT) Object RA Dec mag sep mel Arcturus 14:16:51.5 +19:02:51 0.0 9.41 101 Vindemiatrix 13:03:28.9 +10:49:08 2.8 13.06 115 PPM 130137 13:53:35.5 +12:02:11 6.0 1.28 103 PPM 130207 13:59:02.3 +11:50:08 7.9 1.02 102 PPM 130171 13:56:21.6 +11:01:01 9.8 0.08 102 4836_Medon 13:56:40.0 +10:59:56 14.5 102 Positions are for equinox of date
Star training set for 4836_Medon, (2026/03/15 00:22UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 9.41 101 Vindemiatrix 13:02:10.1 +10:57:33 2.8 13.06 115 PPM 130137 13:52:18.5 +12:09:53 6.0 1.28 103 PPM 130207 13:57:45.4 +11:57:45 7.9 1.02 102 PPM 130171 13:55:04.4 +11:08:40 9.8 0.08 102 4836_Medon 13:55:22.8 +11:07:36 14.5 102 Positions are for J2000