Occultation event with (4836) Medon, event index number 3580
Regions able to see the event: Australia
Geocentric closest approach at 2026/04/05 16:41:22 UTC
J2000 position of star is 13:45:42.1 +12:16:12
Equinox of date position of star is 13:46:59.5 +12:08:21
Star is 45 degrees from the moon. Moon is 88% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=14.3
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.6 per integration for unocculted signal
Expected flux drop is 47% with SNR of 4.5 for the occulted depth (per occulted point)
Apparent velocity is 16.5 km/sec on the sky relative to the star, or, 19.9 arcsec/hr.
Position angle of asteroid motion is 108.4 degrees
The recommended exposure time corresponds to 9.1 km per image.
The 1-sigma error in the time of the event is 1.7 seconds.
The 1-sigma cross-track error in the shadow position is 23.8 km.
The sky-plane scale is 2994.6 km/arcsec.
Diameter estimates:
74.1 km assuming a 5% albedo, maximum of 4.5 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 1.8 sec for a central chord
Cross-track diameter of 63.3 km used for deployment plan.
Star training set for 4836_Medon, (2026/04/05 16:41UT) Object RA Dec mag sep mel Arcturus 14:16:51.7 +19:02:50 0.0 9.97 47 Vindemiatrix 13:03:29.1 +10:49:07 2.8 10.74 51 PPM 130137 13:53:35.7 +12:02:10 6.0 1.62 44 PPM 130102 13:50:52.8 +12:52:51 7.1 1.20 45 PPM 130052 13:46:57.0 +12:07:51 10.0 0.01 45 4836_Medon 13:46:59.5 +12:08:21 14.3 45 Positions are for equinox of date
Star training set for 4836_Medon, (2026/04/05 16:41UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 9.97 47 Vindemiatrix 13:02:10.1 +10:57:33 2.8 10.74 51 PPM 130137 13:52:18.5 +12:09:53 6.0 1.62 44 PPM 130102 13:49:35.8 +13:00:38 7.1 1.20 45 PPM 130052 13:45:39.7 +12:15:41 10.0 0.01 45 4836_Medon 13:45:42.1 +12:16:12 14.3 45 Positions are for J2000