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2017-03-25 / HIP 17113 / (925) Alphonsina

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Bengt Rutersten O+1 CCD M280 SE NTP 20:14:32 20:15:07.0 20:15:08.3 20:16:32 0.5 0.5 1.30 45.5
2 show L. Hermansson et al O+1 CCD M406 SE GPS++ 20:14:42 20:15:05.36 20:15:06.52 20:15:42 0.07 0.07 1.16 40.6
3 show Bengt Rutersten O+2 CCD M280 SE NTP 20:14:32 20:15:07.0 20:15:08.7 20:16:32 0.5 0.5 1.70 59.5
4 show L. Hermansson et al O+2 CCD M406 SE GPS++ 20:14:42 20:15:05.36 20:15:07.00 20:15:42 0.07 0.07 1.64 57.4
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#118 : 39b31363-93f8-4e49-b3c8-7d8ab34cc448 [db: observed]

Using prediction 39b31363-93f8-4e49-b3c8-7d8ab34cc448 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:
Ellipse profile fit was not successful. Trying circular fit.

Circular profile fit was not successful ...








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).

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Sky projection (artificial light) for occ. time: 2017-03-25, 20:15 UT (JD = 2457838.344)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 301None7.878 294°, 41° 2.444471e613367.30.0° None2011-05-02 58.0 +/- 16.0 km 2011-02-18
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] : 39b31363-93f8-4e49-b3c8-7d8ab34cc448 [observed]

 Occultation Date + Time   : 2017-03-25 at 20:13:38 UT +/- 0.0 min  [1]
 Object Designation        : (925) Alphonsina
 Orbit Class               : MBA
 Star Designation          : GDR3 0217328235692110080
 Star Coordinates (ICRF)   : RA = 03 39 55.6916, DE = +31 55 33.082  [2]
 Star Magnitudes           : G = 8.34 mag, RP = 7.34 mag, BP = 9.31 mag
 Object Magnitude          : V = 13.97 mag
 Estimated Magnitude Drop  : 5.6 mag
 Estimated Max. Duration   : 1.6 sec
 Object Mean Diameter      : 54 km  (src: astorb)
 Speed of the shadow       : 35.0 km/s
 Elongation to Moon & Sun  : 85° (sunlit = 7%), Sun = 56°
 Cross-track uncertainty   : 0.3 mas = 0 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 3.88 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#118

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

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