Occultation event with (4715) Medesicaste, event index number 4079
Regions able to see the event: Europe
Geocentric closest approach at 2026/08/23 01:30:18 UTC
J2000 position of star is 05:40:47.9 +40:08:50
Equinox of date position of star is 05:42:39.7 +40:09:32
Star is 166 degrees from the moon. Moon is 77% illuminated.
Stellar brightness G=14.5, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.50 seconds with the standard RECON-QHY system.
SNR of 9.9 per integration for unocculted signal
Expected flux drop is 72% with SNR of 7.1 for the occulted depth (per occulted point)
Apparent velocity is 27.0 km/sec on the sky relative to the star, or, 24.6 arcsec/hr.
Position angle of asteroid motion is 70.5 degrees
The recommended exposure time corresponds to 13.5 km per image.
The 1-sigma error in the time of the event is 0.4 seconds.
The 1-sigma cross-track error in the shadow position is 25.0 km.
The sky-plane scale is 3949.6 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, (2026/08/23 01:30UT) Object RA Dec mag sep mel Aldebaran 04:37:27.2 +16:33:38 0.8 27.51 155 34Bet Aur 06:01:29.0 +44:56:50 1.9 5.91 163 32Nu Aur 05:53:20.3 +39:09:12 4.0 2.29 168 PPM 070699 05:42:23.8 +39:50:46 8.0 0.32 167 PPM 048355 05:43:02.1 +40:10:59 9.7 0.08 166 4715_Medesicas 05:42:39.7 +40:09:32 15.5 166 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/08/23 01:30UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 27.51 155 34Bet Aur 05:59:31.6 +44:56:51 1.9 5.91 163 32Nu Aur 05:51:29.4 +39:08:55 4.0 2.29 168 PPM 070699 05:40:32.2 +39:50:03 8.0 0.32 167 PPM 048355 05:41:10.2 +40:10:17 9.7 0.08 166 4715_Medesicas 05:40:47.9 +40:08:50 15.5 166 Positions are for J2000