Occultation event with (4715) Medesicaste, event index number 1220
Regions able to see the event: SAmericaN
Geocentric closest approach at 2025/08/11 06:34:47 UTC
J2000 position of star is 03:10:19.5 +30:28:49
Equinox of date position of star is 03:11:53.2 +30:34:34
Star is 70 degrees from the moon. Moon is 95% illuminated.
Stellar brightness G=16.8, apparent brightess of occulting body is G=15.3
Use an exposure time of 1.65 seconds with the standard RECON-QHY system.
SNR of 3.1 per integration for unocculted signal
Expected flux drop is 20% with SNR of 0.6 for the occulted depth (per occulted point)
Apparent velocity is 17.6 km/sec on the sky relative to the star, or, 17.7 arcsec/hr.
Position angle of asteroid motion is 43.5 degrees
The recommended exposure time corresponds to 29.1 km per image.
The 1-sigma error in the time of the event is 1.5 seconds.
The 1-sigma cross-track error in the shadow position is 7.5 km.
The sky-plane scale is 3583.8 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, aximum of 3.7 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 1.5 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2025/08/11 06:35UT) Object RA Dec mag sep mel Aldebaran 04:37:23.6 +16:33:31 0.8 24.01 86 44Zet Per 03:55:44.9 +31:57:27 2.8 9.47 80 PPM 068258 03:16:54.4 +30:39:00 5.5 1.08 71 PPM 068105 03:08:25.4 +30:37:27 7.3 0.75 70 PPM 092290 03:13:49.3 +29:54:47 9.2 0.78 71 PPM 068161 03:11:17.6 +30:20:42 10.6 0.26 70 4715_Medesicas 03:11:53.2 +30:34:34 15.3 71 Positions are for equinox of date
Star training set for 4715_Medesicaste, (2025/08/11 06:35UT) Object RA Dec mag sep mel Aldebaran 04:35:55.4 +16:30:29 0.8 24.01 86 44Zet Per 03:54:07.9 +31:53:01 2.8 9.47 80 PPM 068258 03:15:20.4 +30:33:24 5.5 1.08 71 PPM 068105 03:06:51.9 +30:31:37 7.3 0.75 70 PPM 092290 03:12:15.9 +29:49:05 9.2 0.78 71 PPM 068161 03:09:44.1 +30:14:56 10.6 0.26 70 4715_Medesicas 03:10:19.5 +30:28:49 15.3 70 Positions are for J2000