Occultation event with (4715) Medesicaste, event index number 4027
Regions able to see the event: Europe
Geocentric closest approach at 2026/08/17 01:53:52 UTC
J2000 position of star is 05:35:48.3 +39:49:21
Equinox of date position of star is 05:37:39.7 +39:50:16
Star is 114 degrees from the moon. Moon is 22% illuminated.
Stellar brightness G=15.7, 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 3.8 per integration for unocculted signal
Expected flux drop is 47% with SNR of 1.8 for the occulted depth (per occulted point)
Apparent velocity is 29.0 km/sec on the sky relative to the star, or, 26.0 arcsec/hr.
Position angle of asteroid motion is 72.0 degrees
The recommended exposure time corresponds to 14.5 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 26.0 km.
The sky-plane scale is 4004.5 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 2.3 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 0.9 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/08/17 01:54UT) Object RA Dec mag sep mel Aldebaran 04:37:27.1 +16:33:38 0.8 26.70 129 34Bet Aur 06:01:29.0 +44:56:50 1.9 6.74 110 PPM 048174 05:32:41.7 +41:28:48 6.0 1.89 115 PPM 048282 05:38:44.2 +40:11:48 7.2 0.41 114 PPM 070564 05:36:59.5 +39:52:02 9.3 0.13 115 4715_Medesicas 05:37:39.7 +39:50:16 15.5 114 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/08/17 01:54UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 26.70 129 34Bet Aur 05:59:31.6 +44:56:51 1.9 6.74 110 PPM 048174 05:30:48.6 +41:27:42 6.0 1.89 115 PPM 048282 05:36:52.4 +40:10:57 7.2 0.41 114 PPM 070564 05:35:08.1 +39:51:06 9.3 0.13 115 4715_Medesicas 05:35:48.3 +39:49:21 15.5 114 Positions are for J2000