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2020-06-24 / 4UC 312-236048 / (121) Hermione

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jean-Louis Dumont O+ CCD M408 FR GPS++ 23:33:08 23:35:09.02 23:35:18.89 23:37:08 0.36 0.41 9.87 128.3
2 show Stefan Meister O+ CCD M500 CH GPS++ 23:33:47 23:34:27.17 23:34:35.92 23:35:17 0.35 1.10 8.75 113.8
3 show A. Leroy et al O+ CCD M300 FR GPS++ 23:07:00 23:34:55.33 23:35:04.71 23:12:00 0.50 0.63 9.38 121.9
4 show O. Schreurs et al O+ VID M406 BE GPS++ 23:34:06 23:34:38.54 23:34:47.82 23:35:49 0.96 0.64 9.28 120.6
5 show Chad Ellington O+ VID M250 DE GPS++ 23:33:11 23:34:34.71 23:34:44.59 23:36:09 1.07 1.07 9.88 128.4
6 show Tim Haymes O+ CCD M279 UK GPS++ 23:32:10 23:35:10.21 23:35:17.73 23:38:10 0.48 0.64 7.52 97.8
7 show Simon Kidd O+ CCD M350 UK GPS++ 23:34:00 23:35:03.47 23:35:12.65 23:36:15 0.61 0.46 9.18 119.3
8 show Wolfgang Beisker O- CCD M535 PT 23:35:00 23:38:00
9 show Pietro Baruffetti O- VID M300 IT 23:32:43 23:35:43
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

9 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#133 : c1c6de4f-51ad-4f6f-847a-5b9afd082b23 [db: observed]

Using prediction c1c6de4f-51ad-4f6f-847a-5b9afd082b23 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 = 407 x 129 km
a',b' = 203.4, 64.4 km
X0,Y0 = 1638.3, 2.9 km
Mean diameter = 229 km

From 7 chords (VID,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: 2020-06-24, 23:34 UT (JD = 2459025.482)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 155None5.551 359°, 8° 2.443032e615993.50.0° None2010-04-15 not scaled 2009-08-27
# 1564.05.551 3°, 15° 2.443032e615993.50.0° None2017-09-21 200.0 +/- 15.0 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] : c1c6de4f-51ad-4f6f-847a-5b9afd082b23 [observed]

 Occultation Date + Time   : 2020-06-24 at 23:35:48 UT +/- 0.01 min  [1]
 Object Designation        : (121) Hermione
 Orbit Class               : MBA
 Star Designation          : GDR3 6762083647123963008
 Star Coordinates (ICRF)   : RA = 18 57 24.6006, DE = -27 42 17.029  [2]
 Star Magnitudes           : G = 13.35 mag, RP = 12.81 mag, BP = 13.71 mag
 Object Magnitude          : V = 12.36 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 16.1 sec
 Object Mean Diameter      : 209 km  (src: astorb)
 Speed of the shadow       : 13.0 km/s
 Elongation to Moon & Sun  : 143° (sunlit = 15%), Sun = 170°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.94 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#133

 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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