Occultation event with (4836) Medon, event index number 769
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/03/06 22:48:42 UTC
J2000 position of star is 11:21:34.6 +30:08:35
Equinox of date position of star is 11:22:55.3 +30:00:18
Star is 78 degrees from the moon. Moon is 53% illuminated.
Stellar brightness G=15.4, apparent brightess of occulting body is G=14.2
Use an exposure time of 1.15 seconds with the standard RECON-QHY system.
Expected flux drop is 75% with SNR of 6.9 per integration
Apparent velocity is 15.7 km/sec on the sky relative to the star, or, 20.2 arcsec/hr.
The recommended exposure time corresponds to 18.0 km per image.
The 1-sigma error in the time of the event is 3.3 seconds.
The 1-sigma cross-track error in the shadow position is 23.9 km.
The sky-plane scale is 2802.7 km/arcsec.
Diameter estimates:
72.8 km assuming a 5% albedo, aximum of 4.6 sec for a central chord
29.7 km assuming a 30% albedo, maximum of 1.9 sec for a central chord
Cross-track diameter of 72.8 km used for deployment plan.
Star training set for 4836_Medon, (2025/03/06 22:49UT) Object RA Dec mag sep mel Regulus 10:09:42.6 +11:50:35 1.3 24.86 70 68Del Leo 11:15:26.6 +20:23:07 2.6 9.77 80 PPM 101269 11:37:37.2 +27:38:30 5.9 3.99 82 PPM 101138 11:26:37.0 +29:37:11 8.2 0.89 79 PPM 075806 11:21:32.0 +29:58:57 8.8 0.30 77 4836_Medon 11:22:55.3 +30:00:18 14.2 78 Positions are for equinox of date
Star training set for 4836_Medon, (2025/03/06 22:49UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 24.86 70 68Del Leo 11:14:06.7 +20:31:22 2.6 9.77 80 PPM 101269 11:36:18.0 +27:46:52 5.9 3.99 82 PPM 101138 11:25:16.7 +29:45:30 8.2 0.89 79 PPM 075806 11:20:11.2 +30:07:14 8.8 0.30 77 4836_Medon 11:21:34.6 +30:08:35 14.2 78 Positions are for J2000