Occultation event with (4715) Medesicaste, event index number 4086
Regions able to see the event: Australia
Geocentric closest approach at 2026/08/23 19:17:46 UTC
J2000 position of star is 05:41:23.6 +40:11:18
Equinox of date position of star is 05:43:15.5 +40:11:59
Star is 161 degrees from the moon. Moon is 82% illuminated.
Stellar brightness G=13.1, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
SNR of 10.5 per integration for unocculted signal
Expected flux drop is 91% with SNR of 9.5 for the occulted depth (per occulted point)
Apparent velocity is 26.7 km/sec on the sky relative to the star, or, 24.4 arcsec/hr.
Position angle of asteroid motion is 70.2 degrees
The recommended exposure time corresponds to 3.2 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 25.1 km.
The sky-plane scale is 3942.6 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 2.5 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 19:18UT) Object RA Dec mag sep mel Aldebaran 04:37:27.2 +16:33:38 0.8 27.61 147 34Bet Aur 06:01:29.1 +44:56:50 1.9 5.81 159 32Nu Aur 05:53:20.3 +39:09:12 4.0 2.20 163 PPM 070699 05:42:23.8 +39:50:46 8.0 0.39 161 PPM 048355 05:43:02.1 +40:10:59 9.7 0.05 161 4715_Medesicas 05:43:15.5 +40:11:59 15.5 161 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/08/23 19:18UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 27.61 147 34Bet Aur 05:59:31.6 +44:56:51 1.9 5.81 159 32Nu Aur 05:51:29.4 +39:08:55 4.0 2.20 163 PPM 070699 05:40:32.2 +39:50:03 8.0 0.39 161 PPM 048355 05:41:10.2 +40:10:17 9.7 0.05 161 4715_Medesicas 05:41:23.6 +40:11:18 15.5 161 Positions are for J2000