Occultation event with (4715) Medesicaste, event index number 3953
Regions able to see the event: SAmericaN
Geocentric closest approach at 2026/08/07 08:26:52 UTC
J2000 position of star is 05:27:04.7 +39:18:28
Equinox of date position of star is 05:28:55.3 +39:19:42
Star is 24 degrees from the moon. Moon is 36% illuminated.
Stellar brightness G=15.2, apparent brightess of occulting body is G=15.5
Use an exposure time of 0.45 seconds with the standard RECON-QHY system.
SNR of 5.2 per integration for unocculted signal
Expected flux drop is 58% with SNR of 3.0 for the occulted depth (per occulted point)
Apparent velocity is 32.0 km/sec on the sky relative to the star, or, 28.2 arcsec/hr.
Position angle of asteroid motion is 73.8 degrees
The recommended exposure time corresponds to 14.4 km per image.
The 1-sigma error in the time of the event is 0.3 seconds.
The 1-sigma cross-track error in the shadow position is 26.1 km.
The sky-plane scale is 4087.8 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 2.0 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 0.8 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/08/07 08:27UT) Object RA Dec mag sep mel Aldebaran 04:37:27.0 +16:33:38 0.8 25.38 14 34Bet Aur 06:01:28.9 +44:56:50 1.9 8.24 32 PPM 048055 05:24:42.5 +41:03:09 5.0 1.90 24 PPM 070355 05:28:35.0 +38:58:41 8.1 0.36 24 PPM 070363 05:28:44.2 +39:27:04 9.9 0.13 24 4715_Medesicas 05:28:55.3 +39:19:42 15.5 24 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2026/08/07 08:27UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 25.38 14 34Bet Aur 05:59:31.6 +44:56:51 1.9 8.24 32 PPM 048055 05:22:50.2 +41:01:45 5.0 1.90 24 PPM 070355 05:26:44.8 +38:57:26 8.1 0.36 24 PPM 070363 05:26:53.5 +39:25:50 9.9 0.13 24 4715_Medesicas 05:27:04.7 +39:18:28 15.5 24 Positions are for J2000