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2017-08-12 / 4UC 427-103028 / (256) Walpurga

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show E. Frappa/A. Klotz O+ CCD M250 FR GPS++ 22:11:44 22:12:25.39 22:12:31.06 22:14:57 0.33 0.22 5.67 55.0
2 show Alberto Ossola O+ VID M230 CH GPS++ 22:11:36 22:12:07.83 22:12:08.95 22:13:00 0.56 0.56 1.12 10.9
3 show Michel Bonnardeau O- CCD M203 FR 22:11:47 22:12:47
4 show Andrea Manna O- VID M200 CH 22:07:09 22:16:47
5 show Stefano Sposetti O- VID M280 CH 22:07:54 22:16:50
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#65 : dcea6302-fff4-49dc-b5c4-107877f6ef4c [db: observed]

Using prediction dcea6302-fff4-49dc-b5c4-107877f6ef4c 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:
X0,Y0 = 1961.6, 24.5 km
Circular diameter = 63 km

From 2 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: 2017-08-12, 22:11 UT (JD = 2457978.424)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 40711.016.660 220°, 73° 2.448894e69084.40.0° None2019-09-26 not scaled 2019-05-07
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] : dcea6302-fff4-49dc-b5c4-107877f6ef4c [observed]

 Occultation Date + Time   : 2017-08-12 at 22:19:05 UT +/- 0.0 min  [1]
 Object Designation        : (256) Walpurga
 Orbit Class               : MBA
 Star Designation          : GDR3 4211792917852535168
 Star Coordinates (ICRF)   : RA = 19 20 58.6677, DE = -04 46 15.162  [2]
 Star Magnitudes           : G = 12.35 mag, RP = 11.77 mag, BP = 12.75 mag
 Object Magnitude          : V = 14.5 mag
 Estimated Magnitude Drop  : 2.3 mag
 Estimated Max. Duration   : 6.5 sec
 Object Mean Diameter      : 63 km  (src: astorb)
 Speed of the shadow       : 9.7 km/s
 Elongation to Moon & Sun  : 93° (sunlit = 73%), Sun = 146°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#65

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

More Data and Informations
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