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2022-01-21 / 4UC 581-011811 / (212) Medea

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jesus Delgado O+ CCD M280 ES GPS++ 20:24:23 20:26:56.41 20:27:54.97 20:30:23 0.25 0.25 58.56 140.5
2 show Mark Fairfax O+ CCD V112 UK NTP 20:14:01 20:15:41.69 20:16:41.44 20:21:00 0.29 0.29 59.75 143.4
3 show Alex Pratt O+ VID M279 UK GPS++ 20:13:25 20:15:31.37 20:16:08.49 20:18:00 0.32 0.32 37.12 89.1
4 show Faustino Garcia O- CCD M250 ES 20:22:37 20:24:13
5 show Simon Kidd O- CCD M350 UK 20:14:43 20:19:00
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#106 : 95c450bc-02a2-45e4-94a8-d936945fcfcf [db: observed]
JPL#106 : c4ec7dee-bdd5-44f5-a0a8-1d891e94ec8f [db: observed]

Using prediction 95c450bc-02a2-45e4-94a8-d936945fcfcf 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 = 198 x 94 km
a',b' = 98.8, 47.2 km
X0,Y0 = 677.1, 34.6 km
Mean diameter = 137 km

From 3 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: 2022-01-21, 20:26 UT (JD = 2459601.351)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 1091None10.284 40°, -24° 2.445234e614367.40.0° NoneNone not scaled 2016-01-04
# 1092None10.284 220°, -33° 2.445234e614367.40.0° NoneNone not scaled 2016-01-04
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] : 95c450bc-02a2-45e4-94a8-d936945fcfcf [observed]

 Occultation Date + Time   : 2022-01-21 at 20:35:10 UT +/- 0.39 min  [1]
 Object Designation        : (212) Medea
 Orbit Class               : MBA
 Star Designation          : GDR3 0151214700297272576
 Star Coordinates (ICRF)   : RA = 04 28 48.5217, DE = +26 03 34.294  [2]
 Star Magnitudes           : G = 12.42 mag, RP = 11.51 mag, BP = 13.28 mag
 Object Magnitude          : V = 13.26 mag
 Estimated Magnitude Drop  : 1.3 mag
 Estimated Max. Duration   : 55.6 sec
 Object Mean Diameter      : 136 km  (src: astorb)
 Speed of the shadow       : 2.4 km/s
 Elongation to Moon & Sun  : 96° (sunlit = 86%), Sun = 128°
 Cross-track uncertainty   : 1.3 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.13 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#106

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

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