Occultation event with (4715) Medesicaste, event index number 1164
Regions able to see the event: Australia
Geocentric closest approach at 2025/07/23 18:44:36 UTC
J2000 position of star is 03:01:29.3 +28:50:05
Equinox of date position of star is 03:03:01.4 +28:56:04
Star is 57 degrees from the moon. Moon is 1% illuminated.
Stellar brightness G=15.8, apparent brightess of occulting body is G=15.4
Use an exposure time of 0.65 seconds with the standard RECON-QHY system.
SNR of 3.9 per integration for unocculted signal
Expected flux drop is 40% with SNR of 1.6 for the occulted depth (per occulted point)
Apparent velocity is 24.4 km/sec on the sky relative to the star, or, 23.3 arcsec/hr.
The recommended exposure time corresponds to 15.9 km per image.
The 1-sigma error in the time of the event is 1.4 seconds.
The 1-sigma cross-track error in the shadow position is 28.3 km.
The sky-plane scale is 3776.1 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, aximum of 2.7 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 65.5 km used for deployment plan.
Star training set for 4715_Medesicaste, (2025/07/23 18:45UT) Object RA Dec mag sep mel Aldebaran 04:37:23.4 +16:33:31 0.8 24.95 39 44Zet Per 03:55:44.7 +31:57:27 2.8 11.75 45 PPM 092179 03:05:02.1 +28:22:07 6.5 0.72 56 PPM 092184 03:05:31.6 +28:36:27 8.5 0.64 56 PPM 092158 03:03:19.0 +28:52:32 10.7 0.09 57 4715_Medesicas 03:03:01.4 +28:56:04 15.4 56 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2025/07/23 18:45UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.95 39 44Zet Per 03:54:07.9 +31:53:01 2.8 11.75 45 PPM 092179 03:03:30.3 +28:16:11 6.5 0.72 56 PPM 092184 03:03:59.6 +28:30:32 8.5 0.64 56 PPM 092158 03:01:46.9 +28:46:34 10.7 0.09 57 4715_Medesicas 03:01:29.3 +28:50:05 15.4 57 Positions are for J2000