Occultation event with (4715) Medesicaste, event index number 4112
Regions able to see the event: UAE
Geocentric closest approach at 2026/08/28 00:13:42 UTC
J2000 position of star is 05:44:40.9 +40:25:16
Equinox of date position of star is 05:46:33.1 +40:25:49
Star is 113 degrees from the moon. Moon is 100% illuminated.
Stellar brightness G=16.0, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.60 seconds with the standard RECON-QHY system.
SNR of 3.3 per integration for unocculted signal
Expected flux drop is 39% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 25.3 km/sec on the sky relative to the star, or, 23.3 arcsec/hr.
Position angle of asteroid motion is 68.9 degrees
The recommended exposure time corresponds to 15.2 km per image.
The 1-sigma error in the time of the event is 0.5 seconds.
The 1-sigma cross-track error in the shadow position is 26.1 km.
The sky-plane scale is 3902.4 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 2.6 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 1.1 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/08/28 00:14UT) Object RA Dec mag sep mel Pollux 07:46:56.6 +27:57:34 1.1 27.66 140 34Bet Aur 06:01:29.1 +44:56:50 1.9 5.28 115 PPM 070954 05:54:31.0 +39:34:43 6.5 1.75 115 PPM 048416 05:47:41.8 +40:30:56 6.6 0.23 113 PPM 048400 05:46:17.0 +40:24:49 8.7 0.05 113 4715_Medesicas 05:46:33.1 +40:25:49 15.5 113 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/08/28 00:14UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 27.66 140 34Bet Aur 05:59:31.6 +44:56:51 1.9 5.28 115 PPM 070954 05:52:39.6 +39:34:29 6.5 1.75 115 PPM 048416 05:45:49.4 +40:30:26 6.6 0.23 113 PPM 048400 05:44:24.8 +40:24:15 8.7 0.05 113 4715_Medesicas 05:44:40.9 +40:25:16 15.5 113 Positions are for J2000