Occultation event with (4715) Medesicaste, event index number 5090
Regions able to see the event: Europe
Geocentric closest approach at 2026/12/07 06:06:21 UTC
J2000 position of star is 05:46:28.0 +46:06:30
Equinox of date position of star is 05:48:28.2 +46:06:59
Star is 144 degrees from the moon. Moon is 3% illuminated.
Stellar brightness G=12.2, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 19.0 per integration for unocculted signal
Expected flux drop is 91% with SNR of 17.4 for the occulted depth (per occulted point)
Apparent velocity is 16.7 km/sec on the sky relative to the star, or, 19.6 arcsec/hr.
Position angle of asteroid motion is 97.8 degrees
The recommended exposure time corresponds to 2.0 km per image.
The 1-sigma error in the time of the event is 0.2 seconds.
The 1-sigma cross-track error in the shadow position is 28.4 km.
The sky-plane scale is 3068.5 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, (2026/12/07 06:06UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 29.52 123 34Bet Aur 06:01:30.3 +44:56:50 1.9 2.56 143 35Pi Aur 06:01:56.1 +45:56:09 5.9 2.34 142 PPM 048452 05:50:15.6 +46:43:43 7.6 0.69 144 PPM 048404 05:46:38.7 +46:06:56 9.7 0.32 145 PPM 048446 05:49:18.2 +46:04:04 10.4 0.15 144 4715_Medesicas 05:48:28.2 +46:06:59 14.7 144 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/12/07 06:06UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 29.52 123 34Bet Aur 05:59:31.6 +44:56:51 1.9 2.56 143 35Pi Aur 05:59:56.1 +45:56:12 5.9 2.34 142 PPM 048452 05:48:14.6 +46:43:17 7.6 0.69 144 PPM 048404 05:44:38.5 +46:06:22 9.7 0.32 145 PPM 048446 05:47:18.1 +46:03:37 10.4 0.15 144 4715_Medesicas 05:46:28.0 +46:06:30 14.7 144 Positions are for J2000