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2022-08-09 / 4UC 417-144537 / (1585) Union

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Peter Nosal O+ CCD M250 SK NTP+ 22:22:13 22:24:22.6 22:24:25.3 22:25:16 0.3 0.3 2.70 40.8
2 show Daniel Blazewicz O+ CCD M350 PL NTP+ 22:22:00 22:24:14.4 22:24:16.8 22:26:40 0.3 0.3 2.40 36.2
3 show Leszek Benedyktowicz O+ CCD M203 PL GPS+ 22:23:42 22:24:15.1 22:24:18.7 22:24:41 0.3 0.3 3.60 54.4
4 show Peter Delincak O- CCD M400 SK 22:23:30 22:25:30
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

4 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#70 : ce7b1a6b-d3b1-4c79-9f70-935bc03605a0 [db: observed]

Using prediction ce7b1a6b-d3b1-4c79-9f70-935bc03605a0 for map and profile fit

Get observations as KML file (reduced site location resolution)

Ellipse and circular profile fits to the timings (chords)

 Auto-Fit Result:
Ellipse profile fit was not successful. Trying circular fit.

Circular diameter = 57 km

From 3 chords (CCD)








You can enter space separated chord numbers (example: 11 4 8) or a method like VIS to ignore all visual timings, or a time source like RAD and NTP (but not GPS).
If the plot disappears, then there are less than 2 chords left (too much ignored, go back with browser).

Check SiMDA for size and mass data.

Check Johnston Archive for satellites.

Sky projection (artificial light) for occ. time: 2022-08-09, 22:23 UT (JD = 2459801.433)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 46521.012.799 2°, -65° 2.45723e62571.40.0° None2020-10-05 not scaled 2019-10-23
Q: model quality flag (0-5, 5=highest) | P: rotation period | λ,β: ecl. lon. and lat. of spin axis (J2000) | JD: initial time (epoch) | φ0: initial rotation angle for JD0

 
Image size: 300px. Transparent image background for copy & paste

Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : ce7b1a6b-d3b1-4c79-9f70-935bc03605a0 [observed]

 Occultation Date + Time   : 2022-08-09 at 22:28:10 UT +/- 0.02 min  [1]
 Object Designation        : (1585) Union
 Orbit Class               : MBA
 Star Designation          : GDR3 6899040915714559488
 Star Coordinates (ICRF)   : RA = 21 20 21.7359, DE = -06 39 37.089  [2]
 Star Magnitudes           : G = 14.7 mag, RP = 14.2 mag, BP = 15.04 mag
 Object Magnitude          : V = 14.1 mag
 Estimated Magnitude Drop  : 0.5 mag
 Estimated Max. Duration   : 3.3 sec
 Object Mean Diameter      : 50 km  (src: astorb)
 Speed of the shadow       : 15.1 km/s
 Elongation to Moon & Sun  : 35° (sunlit = 93%), Sun = 171°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#70

 
 [1] time t0 of closest geocentric approach c/a, [2] including proper motion until t0

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