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2020-08-16 / 4UC 606-005860 / (1306) Scythia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Michal Rottenborn O+ CCD M303 CZ GPS++ 23:25:00 23:26:55.51 23:27:01.74 23:29:00 0.22 0.25 6.23 71.6
2 show Jiri Kubanek O+ CCD M203 CZ GPS++ 23:24:54 23:26:57.38 23:26:59.88 23:29:07 0.25 0.25 2.50 28.8
3 show Jiri Polak O+ CCD M303 CZ GPS++ 23:25:19 23:26:57.44 23:27:04.64 23:29:19 0.40 0.40 7.20 82.8
4 show Christian Weber O+ CCD M254 DE GPS++ 23:26:40 23:27:23.19 23:27:26.19 23:29:05 0.75 0.75 3.00 34.5
5 show Nikolai Wuensche O+ CCD M300 DE GPS++ 23:25:36 23:27:26.58 23:27:28.83 23:29:35 0.25 0.25 2.25 25.9
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

5 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#69 : bdbe8e2d-7e93-43e7-8178-f6eb379e4db0 [db: observed]

Using prediction bdbe8e2d-7e93-43e7-8178-f6eb379e4db0 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 = 90 km

From 5 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: 2020-08-16, 23:26 UT (JD = 2459078.476)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 45511.07.524 32°, 10° 2.457319e61759.50.0° None2020-10-05 not scaled 2019-10-23
# 45521.07.524 215°, -22° 2.457319e61759.50.0° 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] : bdbe8e2d-7e93-43e7-8178-f6eb379e4db0 [observed]

 Occultation Date + Time   : 2020-08-16 at 23:27:20 UT +/- 0.03 min  [1]
 Object Designation        : (1306) Scythia
 Orbit Class               : MBA
 Star Designation          : GDR3 0324561607588293888
 Star Coordinates (ICRF)   : RA = 02 11 35.0806, DE = +31 00 54.421  [2]
 Star Magnitudes           : G = 14.49 mag, RP = 13.6 mag, BP = 15.31 mag
 Object Magnitude          : V = 15.32 mag
 Estimated Magnitude Drop  : 1.3 mag
 Estimated Max. Duration   : 5.9 sec
 Object Mean Diameter      : 68 km  (src: astorb)
 Speed of the shadow       : 11.5 km/s
 Elongation to Moon & Sun  : 75° (sunlit = 6%), Sun = 103°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.06 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#69

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

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