Occultation event with (4715) Medesicaste, event index number 3386
Regions able to see the event: Europe
Geocentric closest approach at 2026/03/09 21:18:17 UTC
J2000 position of star is 02:51:49.8 +32:05:32
Equinox of date position of star is 02:53:25.4 +32:11:55
Star is 164 degrees from the moon. Moon is 64% illuminated.
Stellar brightness G=14.7, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.55 seconds with the standard RECON-QHY system.
SNR of 9.2 per integration for unocculted signal
Expected flux drop is 68% with SNR of 6.2 for the occulted depth (per occulted point)
Apparent velocity is 27.3 km/sec on the sky relative to the star, or, 25.0 arcsec/hr.
Position angle of asteroid motion is 80.9 degrees
The recommended exposure time corresponds to 15.0 km per image.
The 1-sigma error in the time of the event is 0.6 seconds.
The 1-sigma cross-track error in the shadow position is 21.2 km.
The sky-plane scale is 3929.7 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 2.4 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 1.0 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/03/09 21:18UT) Object RA Dec mag sep mel Aldebaran 04:37:25.6 +16:33:35 0.8 28.25 167 Algol 03:09:53.0 +41:03:17 2.1 9.45 162 21 Per 02:58:53.1 +32:02:16 5.1 1.17 165 PPM 067813 02:52:01.5 +32:04:46 6.6 0.32 164 PPM 067836 02:52:57.4 +32:19:10 11.9 0.16 164 4715_Medesicas 02:53:25.4 +32:11:55 15.5 164 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/03/09 21:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 28.25 167 Algol 03:08:10.1 +40:57:20 2.1 9.45 162 21 Per 02:57:17.3 +31:56:02 5.1 1.17 165 PPM 067813 02:50:26.1 +31:58:21 6.6 0.32 164 PPM 067836 02:51:21.8 +32:12:46 11.9 0.16 164 4715_Medesicas 02:51:49.8 +32:05:32 15.5 164 Positions are for J2000