Occultation event with (4715) Medesicaste, event index number 4505
Regions able to see the event: Europe,Australia
Geocentric closest approach at 2026/10/28 19:13:52 UTC
J2000 position of star is 06:06:06.4 +44:18:00
Equinox of date position of star is 06:08:03.9 +44:17:44
Star is 25 degrees from the moon. Moon is 90% illuminated.
Stellar brightness G=14.0, apparent brightess of occulting body is G=15.1
Use an exposure time of 0.25 seconds with the standard RECON-QHY system.
SNR of 9.0 per integration for unocculted signal
Expected flux drop is 74% with SNR of 6.7 for the occulted depth (per occulted point)
Apparent velocity is 9.7 km/sec on the sky relative to the star, or, 10.6 arcsec/hr.
Position angle of asteroid motion is 154.9 degrees
The recommended exposure time corresponds to 2.4 km per image.
The 1-sigma error in the time of the event is 2.7 seconds.
The 1-sigma cross-track error in the shadow position is 11.7 km.
The sky-plane scale is 3287.6 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 6.8 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 2.8 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/10/28 19:14UT) Object RA Dec mag sep mel Pollux 07:46:57.3 +27:57:33 1.1 25.62 42 34Bet Aur 06:01:29.8 +44:56:50 1.9 1.34 25 38 Aur 06:05:14.0 +42:54:28 6.1 1.48 24 PPM 048699 06:05:30.3 +43:47:12 8.1 0.69 24 PPM 048706 06:06:10.7 +44:16:24 10.0 0.34 25 PPM 048754 06:08:58.2 +44:08:43 10.3 0.22 25 4715_Medesicas 06:08:03.9 +44:17:44 15.1 25 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/10/28 19:14UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 25.62 42 34Bet Aur 05:59:31.6 +44:56:51 1.9 1.34 25 38 Aur 06:03:18.2 +42:54:38 6.1 1.48 24 PPM 048699 06:03:33.5 +43:47:23 8.1 0.69 24 PPM 048706 06:04:13.3 +44:16:36 10.0 0.34 25 PPM 048754 06:07:01.0 +44:09:01 10.3 0.22 25 4715_Medesicas 06:06:06.4 +44:18:00 15.1 25 Positions are for J2000