Occultation event with (624) Hektor, event index number 21
Regions able to see the event: US,RECON
Geocentric closest approach at 2025/02/21 13:05:47 UTC
J2000 position of star is 10:15:33.0 +16:04:49
Equinox of date position of star is 10:16:54.6 +15:57:16
Star is 103 degrees from the moon. Moon is 42% illuminated.
Stellar brightness G=11.6, apparent brightess of occulting body is G=12.0
Use an exposure time of 0.12 seconds with the standard RECON-QHY system.
Expected flux drop is 42% with SNR of 21.7 per integration
Apparent velocity is 17.9 km/sec on the sky relative to the star, or, 21.4 arcsec/hr.
The recommended exposure time corresponds to 2.2 km per image.
The 1-sigma error in the time of the event is 1.0 seconds.
The 1-sigma cross-track error in the shadow position is 13.9 km.
The sky-plane scale is 3021.5 km/arcsec.
Diameter estimates:
200.4 km assuming a 5% albedo, aximum of 11.2 sec for a central chord
81.8 km assuming a 30% albedo, maximum of 4.6 sec for a central chord
Cross-track diameter of 200.4 km used for deployment plan.
Star training set for 624_Hektor, (2025/02/21 13:06UT) Object RA Dec mag sep mel Regulus 10:09:42.5 +11:50:36 1.3 4.47 102 PPM 127261 10:17:38.1 +17:36:49 6.5 1.67 103 PPM 127235 10:15:53.4 +16:00:45 7.7 0.25 103 624_Hektor 10:16:54.6 +15:57:16 12.0 102 Positions are for equinox of date
This table contains the target star visibility for registered RECON 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 100.0 % chance of getting at least one chord. There is a 100.0% 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Bend | 13:02:25 | -20.9 | Dark | Up | 23.9 | 269.6 | Low | 12:59:01-13:05:01 | 130.7 | 0.001 | Oregon Observatory | 13:02:24 | -21.0 | Dark | Up | 24.0 | 269.6 | Low | 12:58:59-13:04:59 | 115.0 | 0.017 | Chiloquin | 13:02:19 | -21.4 | Dark | Up | 24.3 | 269.9 | Low | 12:59:00-13:05:00 | 6.8 | 1.000 | Klamath Falls | 13:02:17 | -21.4 | Dark | Up | 24.2 | 270.1 | Low | 12:58:57-13:04:57 | -17.1 | 1.000 | Cedarville | 13:02:12 | -20.3 | Dark | Up | 23.1 | 271.4 | Low | 12:58:55-13:04:55 | -29.9 | 1.000 | Fall River/Burney | 13:02:11 | -21.2 | Dark | Up | 24.0 | 270.8 | Low | 12:58:52-13:04:52 | -97.9 | 0.199 |
Star training set for 624_Hektor, (2025/02/21 13:06UT) Object RA Dec mag sep mel Regulus 10:08:21.9 +11:58:02 1.3 4.47 102 PPM 127261 10:16:16.1 +17:44:23 6.5 1.67 103 PPM 127235 10:14:31.8 +16:08:17 7.7 0.25 103 624_Hektor 10:15:33.0 +16:04:49 12.0 103 Positions are for J2000