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2020-04-20 / 4UC 383-111145 / (56) Melete

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show F. Van Den Abbeel O+ VID M200 BE GPS++ 02:05:20 02:06:31.85 02:06:43.21 02:07:20 1.12 1.60 11.36 130.6
2 show O. Schreurs et al O+ VID M406 BE GPS++ 02:05:20 02:06:33.25 02:06:45.65 02:07:30 0.96 0.56 12.40 142.6
3 show Chad Ellington O+ VID M250 DE GPS++ 02:05:22 02:06:38.79 02:06:51.33 02:07:45 1.08 1.08 12.54 144.2
4 show Jan-Maarten Winkel O+ VID M310 NL GPS++ 02:05:37 02:06:46.60 02:06:57.41 02:07:37 0.33 0.33 10.81 124.3
5 show Michal Rottenborn O- VID M303 CZ 02:05:02 02:09:02
6 show Jiri Kubanek O- VID M203 CZ 02:05:01 02:09:08
7 show Karel Halir O- VID M507 CZ 02:05:04 02:09:04
8 show Peter Lindner O- VID M305 DE 02:05:05 02:09:34
9 show Peter Enskonatus O- VID M200 DE 02:06:00 02:08:00
10 show Christian Weber O- CCD M203 DE 02:06:30 02:08:19
11 show Nikolai Wuensche O- CCD M300 DE 02:04:19 02:10:19
12 show Konrad Guhl O- CCD L104 DE 02:04:06 02:08:33
13 show Eberhard Bredner O? VID M254 DE GPS++ 02:00:00 02:06:55.45 02:07:04.21 02:11:00 0.20 0.72 8.76 100.7
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

13 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#134 : ffc55a98-3a0e-418f-8fe1-e3e3d37ed14b [db: observed]

Using prediction ffc55a98-3a0e-418f-8fe1-e3e3d37ed14b 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:
Size = 148 x 53 km
a',b' = 73.9, 26.4 km
X0,Y0 = 2710.2, 16.6 km
Mean diameter = 88 km

From 5 chords (VID)








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: 2020-04-20, 02:06 UT (JD = 2458959.588)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 1105None18.148 103°, -27° 2.443659e615300.60.0° NoneNone not scaled 2016-01-04
# 1106None18.148 282°, -5° 2.443659e615300.60.0° NoneNone not scaled 2016-01-04
# 18513.518.148 103°, -28° 2.443659e615300.60.0° None2017-09-21 116.0 +/- 5.0 km 2017-09-21
# 18523.518.148 283°, -1° 2.443659e615300.60.0° None2017-09-21 116.0 +/- 5.0 km 2017-09-21
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] : ffc55a98-3a0e-418f-8fe1-e3e3d37ed14b [observed]

 Occultation Date + Time   : 2020-04-20 at 02:05:47 UT +/- 0.01 min  [1]
 Object Designation        : (56) Melete
 Orbit Class               : MBA
 Star Designation          : GDR3 4104761130253133696
 Star Coordinates (ICRF)   : RA = 18 32 10.4176, DE = -13 35 04.962  [2]
 Star Magnitudes           : G = 13.05 mag, RP = 11.84 mag, BP = 14.66 mag
 Object Magnitude          : V = 12.27 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 9.8 sec
 Object Mean Diameter      : 113 km  (src: astorb)
 Speed of the shadow       : 11.5 km/s
 Elongation to Moon & Sun  : 81° (sunlit = 8%), Sun = 112°
 Cross-track uncertainty   : 1.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.95 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#134

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

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