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2020-09-09 / 4UC 538-023897 / (52) Europa

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Ivaylo Dinev O+ CCD M254 BG NTP+ 00:11:01 00:12:10.00 00:12:21.42 00:13:30 0.15 0.15 11.42 293.5
2 show Daniel Bertesteanu O+ CCD M200 RO NTP+ 23:53:48 00:12:11.67 00:12:24.70 00:31:03 0.18 0.15 13.03 334.9
3 show Michel Turchenko O+ CCD L80 RU GPS 00:10:00 00:12:20.22 00:12:29.71 00:15:06 0.03 0.03 9.49 243.9
4 show Dariusz Miller O- VIS M202 PL 00:12:20 00:17:28
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#125 : 8b0c6dcd-cf18-4405-b2e3-d9f913b732ca [db: observed]

Using prediction 8b0c6dcd-cf18-4405-b2e3-d9f913b732ca 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 = 360 x 289 km
a',b' = 180.2, 144.7 km
X0,Y0 = -212.5, 12.1 km
Mean diameter = 323 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: 2020-09-09, 00:12 UT (JD = 2459101.508)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 135None5.630 251°, 35° 2.44535930436e613742.20.0° based on an older lightcurve data set, size from AO is 277+/-25 km2013-07-23 293.0 +/- 30.0 km 2011-03-28
# 4634.05.630 259°, 39° 2.44535930436e613742.20.0° None2017-06-19 319.0 +/- 5.0 km 2017-06-13
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] : 8b0c6dcd-cf18-4405-b2e3-d9f913b732ca [observed]

 Occultation Date + Time   : 2020-09-09 at 00:15:16 UT +/- 0.0 min  [1]
 Object Designation        : (52) Europa
 Orbit Class               : MBA
 Star Designation          : GDR3 3373236772768775168
 Star Coordinates (ICRF)   : RA = 06 12 28.6345, DE = +17 27 04.496  [2]
 Star Magnitudes           : G = 9.24 mag, RP = 8.58 mag, BP = 9.74 mag
 Object Magnitude          : V = 12.21 mag
 Estimated Magnitude Drop  : 3.0 mag
 Estimated Max. Duration   : 11.8 sec
 Object Mean Diameter      : 303 km  (src: astorb)
 Speed of the shadow       : 25.7 km/s
 Elongation to Moon & Sun  : 32° (sunlit = 63%), Sun = 74°
 Cross-track uncertainty   : 1.0 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.64 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#125

 Object is a Gaia mass determination target !

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

More Data and Informations
SiMDA | 3D Asteroid Catalogue | Johnston Archive | Star at CDS (Vizier) | JPL Small-Body Node | Minor Planet Center | Wikipedia
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