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2012-04-16 / TYC 4851-02449-1 / (25) Phocaea

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Carles Schnabel O+ VID M400 ES GPS++ 21:18:28 21:21:13.13 21:21:16.72 21:23:28 0.01 0.01 3.59 51.7
2 show Ramon Naves O+ CCD M300 ES NTP 21:20:02 21:21:16.76 21:21:17.86 21:25:04 0.10 0.10 1.10 15.8
3 show Carlos Perello O+ VID M127 ES GPS++ 21:18:11 21:21:14.29 21:21:17.55 21:24:21 0.32 0.32 3.26 46.9
4 show Ricard Casas O+ VID M200 ES GPS++ 21:20:02 21:21:14.55 21:21:17.60 21:22:28 0.12 0.12 3.05 43.9
5 show Joan Rovira O+ VID M200 ES GPS++ 21:17:38 21:21:13.07 21:21:18.09 23:04:10 0.08 0.08 5.02 72.3
6 show E. Frappa/A. Klotz O+ CCD M250 FR GPS++ 21:20:46 21:21:27.09 21:21:32.55 21:24:01 0.08 0.08 5.46 78.6
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

6 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#121 : 88e2d2a5-7c05-44e7-8b4c-369589fee274 [db: observed]

Using prediction 88e2d2a5-7c05-44e7-8b4c-369589fee274 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 = 215 x 85 km
a',b' = 107.4, 42.6 km
X0,Y0 = 880.6, 68.0 km
Mean diameter = 135 km

From 6 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: 2012-04-16, 21:21 UT (JD = 2456034.390)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 697None9.935 347°, 10° 2.433498e622536.40.0° NoneNone not scaled 2013-02-20
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] : 88e2d2a5-7c05-44e7-8b4c-369589fee274 [observed]

 Occultation Date + Time   : 2012-04-16 at 21:15:00 UT +/- 0.0 min  [1]
 Object Designation        : (25) Phocaea
 Orbit Class               : MBA
 Star Designation          : GDR3 3070414296767810944
 Star Coordinates (ICRF)   : RA = 08 08 23.8798, DE = -02 58 07.604  [2]
 Star Magnitudes           : G = 10.79 mag, RP = 10.11 mag, BP = 11.32 mag
 Object Magnitude          : V = 13.34 mag
 Estimated Magnitude Drop  : 2.7 mag
 Estimated Max. Duration   : 5.2 sec
 Object Mean Diameter      : 75 km  (src: astorb)
 Speed of the shadow       : 14.4 km/s
 Elongation to Moon & Sun  : 144° (sunlit = 17%), Sun = 97°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.05 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#121

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

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