Occultation event with (4715) Medesicaste, event index number 4624
Regions able to see the event: Europe
Geocentric closest approach at 2026/11/09 21:31:56 UTC
J2000 position of star is 06:02:43.2 +45:01:58
Equinox of date position of star is 06:04:41.7 +45:01:49
Star is 141 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=16.3, apparent brightess of occulting body is G=15.0
Use an exposure time of 1.30 seconds with the standard RECON-QHY system.
SNR of 3.7 per integration for unocculted signal
Expected flux drop is 22% with SNR of 0.8 for the occulted depth (per occulted point)
Apparent velocity is 11.9 km/sec on the sky relative to the star, or, 13.4 arcsec/hr.
Position angle of asteroid motion is 129.2 degrees
The recommended exposure time corresponds to 15.4 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 21.8 km.
The sky-plane scale is 3193.9 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 5.5 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 2.3 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/11/09 21:32UT) Object RA Dec mag sep mel Pollux 07:46:57.4 +27:57:33 1.1 26.51 121 34Bet Aur 06:01:30.0 +44:56:50 1.9 0.57 142 35Pi Aur 06:01:55.8 +45:56:09 5.9 1.03 141 PPM 048635 06:02:16.8 +44:35:27 7.4 0.61 142 PPM 048685 06:04:56.0 +45:02:12 10.0 0.04 141 4715_Medesicas 06:04:41.7 +45:01:49 15.0 141 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/11/09 21:32UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 26.51 121 34Bet Aur 05:59:31.6 +44:56:51 1.9 0.57 142 35Pi Aur 05:59:56.1 +45:56:12 5.9 1.03 141 PPM 048635 06:00:18.9 +44:35:30 7.4 0.61 142 PPM 048685 06:02:57.5 +45:02:21 10.0 0.04 141 4715_Medesicas 06:02:43.2 +45:01:58 15.0 141 Positions are for J2000