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2008-05-11 / TYC 5775-01052-1 / (287) Nephthys

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show A. Leroy et al O+ VID M355 FR GPS++ 03:10:21 03:16:19.18 03:16:23.30 03:18:00 0.02 0.02 4.12 65.5
2 show Jean Lecacheux O+ VID M1020 FR GPS++ 03:06:08 03:16:17.51 03:16:21.73 03:26:10 0.02 0.02 4.22 67.1
3 show Oliver Kloes O+ VID M254 DE GPS++ 03:11:00 03:16:46.35 03:16:50.70 03:19:00 0.1 0.1 4.35 69.2
4 show Rene Bourtembourg O+ VIS M254 BE RAD++ 03:14:00 03:16:36.2 03:16:37.9 03:19:30 0.1 0.1 1.70 27.0
5 show Maurice Audejean O- CCD M320 FR 03:11:03 03:21:03
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#141 : 8700293b-9917-49e4-8519-9b13ee5ad07b [db: observed]

Using prediction 8700293b-9917-49e4-8519-9b13ee5ad07b 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 = 87 x 63 km
a',b' = 43.6, 31.5 km
X0,Y0 = 1445.2, 20.2 km
Mean diameter = 74 km

From 4 chords (VID,VIS)








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: 2008-05-11, 03:15 UT (JD = 2454597.635)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 989None7.604 356°, 36° 2.443554e611043.60.0° NoneNone not scaled 2016-01-04
# 990None7.604 158°, 39° 2.443554e611043.60.0° 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] : 8700293b-9917-49e4-8519-9b13ee5ad07b [observed]

 Occultation Date + Time   : 2008-05-11 at 03:17:30 UT +/- 0.01 min  [1]
 Object Designation        : (287) Nephthys
 Orbit Class               : MBA
 Star Designation          : GDR3 6895557967819572352
 Star Coordinates (ICRF)   : RA = 21 10 20.6548, DE = -09 57 10.953  [2]
 Star Magnitudes           : G = 9.48 mag, RP = 9.07 mag, BP = 9.74 mag
 Object Magnitude          : V = 12.74 mag
 Estimated Magnitude Drop  : 3.3 mag
 Estimated Max. Duration   : 4.3 sec
 Object Mean Diameter      : 68 km  (src: astorb)
 Speed of the shadow       : 15.9 km/s
 Elongation to Moon & Sun  : 168° (sunlit = 39%), Sun = 94°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.12 mas, dup.src = 1  (0:false, 1:true)

 Ephemeris Reference       : JPL#141

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

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