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2024-12-31 / UCAC4 469-004435 / (318) Magdalena

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jiri Polak O+ VID M300 CZ GPS 18:00:51 18:02:45.21 18:02:59.73 18:04:51 0.18 0.18 14.52 61.0
2 show Michal Rottenborn O+ VID M254 CZ GPS 18:00:52 18:02:45.20 18:02:59.91 18:04:52 0.15 0.15 14.71 61.8
3 show Jiri Kubanek O+ VID M303 CZ GPS 18:01:20 18:02:39.42 18:02:56.18 18:04:20 0.13 0.13 16.76 70.4
4 show Zdenek Sikac O- VID T150 CZ NTP 18:00:59 18:05:00
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

4 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#66 : d809ebb0-8588-11ef-78cd-9b3aebfe76d3 [db: asteroids]
JPL#66 : 4eaf7d50-826b-11ef-6618-401fffdf24fd [db: asteroids]

Using prediction d809ebb0-8588-11ef-78cd-9b3aebfe76d3 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 67 km
a',b' = 43.3, 33.5 km
X0,Y0 = -808.0, 38.6 km
Mean diameter = 76 km

From 3 chords (VID)








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.

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Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : d809ebb0-8588-11ef-78cd-9b3aebfe76d3 [asteroids]

 Occultation Date + Time   : 2024-12-31 at 17:43:55 UT +/- 0.03 min  [1]
 Object Designation        : (318) Magdalena
 Orbit Class               : MBA
 Star Designation          : GDR3 0002480193290254208
 Star Coordinates (ICRF)   : RA = 03 13 25.2946, DE = +03 42 23.216  [2]
 Star Magnitudes           : G = 13.97 mag, RP = 13.37 mag, BP = 14.41 mag
 Object Magnitude          : V = 14.49 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 10.3 sec
 Object Mean Diameter      : 43 km  (src: astorb)
 Speed of the shadow       : 4.2 km/s
 Elongation to Moon & Sun  : 114° (sunlit = 1%), Sun = 125°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#66

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

More Data and Informations
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