Occultation event with (4715) Medesicaste, event index number 5129
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/09 04:24:25 UTC
J2000 position of star is 05:45:00.9 +46:08:21
Equinox of date position of star is 05:47:01.1 +46:08:54
Star is 160 degrees from the moon. Moon is 0% illuminated.
Stellar brightness G=15.6, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 5.6 per integration for unocculted signal
Expected flux drop is 31% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 16.9 km/sec on the sky relative to the star, or, 19.8 arcsec/hr.
Position angle of asteroid motion is 96.1 degrees
The recommended exposure time corresponds to 15.2 km per image.
The 1-sigma error in the time of the event is 0.1 seconds.
The 1-sigma cross-track error in the shadow position is 28.1 km.
The sky-plane scale is 3065.1 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 3.9 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/12/09 04:24UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 29.76 146 34Bet Aur 06:01:30.3 +44:56:50 1.9 2.81 160 PPM 048270 05:38:18.2 +47:43:48 6.1 2.17 159 PPM 048452 05:50:15.6 +46:43:43 7.6 0.81 159 PPM 048404 05:46:38.7 +46:06:56 9.7 0.07 160 4715_Medesicas 05:47:01.1 +46:08:54 14.7 160 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/12/09 04:24UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 29.76 146 34Bet Aur 05:59:31.6 +44:56:51 1.9 2.81 160 PPM 048270 05:36:16.0 +47:42:55 6.1 2.17 159 PPM 048452 05:48:14.6 +46:43:17 7.6 0.81 159 PPM 048404 05:44:38.5 +46:06:22 9.7 0.07 160 4715_Medesicas 05:45:00.9 +46:08:21 14.7 160 Positions are for J2000