Occultation event with (4715) Medesicaste, event index number 5186
Regions able to see the event: US
Geocentric closest approach at 2026/12/12 13:01:32 UTC
J2000 position of star is 05:42:26.5 +46:10:34
Equinox of date position of star is 05:44:26.8 +46:11:13
Star is 143 degrees from the moon. Moon is 11% illuminated.
Stellar brightness G=15.7, apparent brightess of occulting body is G=14.7
Use an exposure time of 0.90 seconds with the standard RECON-QHY system.
SNR of 4.8 per integration for unocculted signal
Expected flux drop is 28% with SNR of 1.3 for the occulted depth (per occulted point)
Apparent velocity is 17.1 km/sec on the sky relative to the star, or, 20.1 arcsec/hr.
Position angle of asteroid motion is 93.3 degrees
The recommended exposure time corresponds to 15.4 km per image.
The 1-sigma error in the time of the event is 0.0 seconds.
The 1-sigma cross-track error in the shadow position is 28.6 km.
The sky-plane scale is 3061.1 km/arcsec.
Diameter estimates:
65.5 km assuming a 5% albedo, maximum of 3.8 sec for a central chord
26.7 km assuming a 30% albedo, maximum of 1.6 sec for a central chord
Cross-track diameter of 62.1 km used for deployment plan.
Star training set for 4715_Medesicaste, (2026/12/12 13:02UT) Object RA Dec mag sep mel Pollux 07:46:57.7 +27:57:32 1.1 30.17 173 34Bet Aur 06:01:30.4 +44:56:50 1.9 3.23 146 PPM 048270 05:38:18.2 +47:43:48 6.1 1.87 141 PPM 048346 05:42:40.8 +45:43:10 8.2 0.56 143 PPM 048366 05:44:02.0 +46:13:52 9.8 0.08 143 4715_Medesicas 05:44:26.8 +46:11:13 14.7 143 Positions are for equinox of date
This table contains the target star visibility for registered US sites that are relevant for this occultation. This list has been filtered to only those sites that can see the field and are within range of the shadow given the uncertainties. The observing time range has been calculated to cover the time of the event at each site with allowances for the event timing uncertainty plus time for obtaining a pre and post event baseline lightcurve. This set of stations has a 0.0 % chance of getting at least one chord. There is a 0.0% chance of 2 or more chords assuming clear weather for all.
| Site Name | Site mid-time (UT) |
Sun alt (deg) |
Sky | Moon | Star alt (deg) |
Star az (deg) |
Target | Observing Time | Xtrack (km) |
Prob |
|---|---|---|---|---|---|---|---|---|---|---|
Star training set for 4715_Medesicaste, (2026/12/12 13:02UT) Object RA Dec mag sep mel Pollux 07:45:17.7 +28:01:33 1.1 30.17 173 34Bet Aur 05:59:31.6 +44:56:51 1.9 3.23 146 PPM 048270 05:36:16.0 +47:42:55 6.1 1.87 141 PPM 048346 05:40:41.2 +45:42:27 8.2 0.56 143 PPM 048366 05:42:01.7 +46:13:12 9.8 0.08 143 4715_Medesicas 05:42:26.5 +46:10:34 14.7 143 Positions are for J2000