Occultation event with (4836) Medon, event index number 3221
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/02/07 09:52:09 UTC
J2000 position of star is 14:00:11.2 +09:07:19
Equinox of date position of star is 14:01:28.7 +08:59:47
Star is 24 degrees from the moon. Moon is 70% illuminated.
Stellar brightness G=16.6, apparent brightess of occulting body is G=14.8
Use an exposure time of 2.00 seconds with the standard RECON-QHY system.
SNR of 3.7 per integration for unocculted signal
Expected flux drop is 16% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 7.0 km/sec on the sky relative to the star, or, 7.6 arcsec/hr.
Position angle of asteroid motion is 29.0 degrees
The recommended exposure time corresponds to 14.0 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 32.1 km.
The sky-plane scale is 3312.8 km/arcsec.
Diameter estimates:
74.1 km assuming a 5% albedo, maximum of 10.6 sec for a central chord
30.3 km assuming a 30% albedo, maximum of 4.3 sec for a central chord
Cross-track diameter of 63.3 km used for deployment plan.
Star training set for 4836_Medon, (2026/02/07 09:52UT) Object RA Dec mag sep mel Arcturus 14:16:51.2 +19:02:52 0.0 10.72 35 Vindemiatrix 13:03:28.6 +10:49:10 2.8 14.40 25 PPM 160252 14:02:38.0 +08:46:11 5.9 0.36 24 PPM 160255 14:02:43.6 +09:10:24 8.5 0.36 24 PPM 160226 14:00:47.2 +08:48:45 10.0 0.25 24 4836_Medon 14:01:28.7 +08:59:47 14.8 24 Positions are for equinox of date
Star training set for 4836_Medon, (2026/02/07 09:52UT) Object RA Dec mag sep mel Arcturus 14:15:37.7 +19:10:06 0.0 10.72 35 Vindemiatrix 13:02:10.1 +10:57:33 2.8 14.40 25 PPM 160252 14:01:20.5 +08:53:42 5.9 0.36 24 PPM 160255 14:01:26.2 +09:17:55 8.5 0.36 24 PPM 160226 13:59:29.6 +08:56:18 10.0 0.25 24 4836_Medon 14:00:11.2 +09:07:19 14.8 24 Positions are for J2000