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2025-04-02 / UCAC4 426-055229 / (3560) Chenqian

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Daniel Blazewicz O+ VID M350 PL GPS 20:09:26 20:11:29.96 20:11:31.67 20:13:32 0.15 0.15 1.71 22.7
2 show Sven Andersson O+ VID M360 DE GPS 20:11:28 20:11:58.1 20:11:59.2 20:12:28 0.2 0.5 1.10 14.6
3 show Christian Weber O+ VID T203 DE GPS 20:11:15 20:11:59.2 20:11:59.9 20:12:48 0.3 0.3 0.70 9.3
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

3 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#57 : 553f0c10-8957-11ef-78cd-f9192fbebca9 [db: asteroids]

Using prediction 553f0c10-8957-11ef-78cd-f9192fbebca9 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 = 35 x 21 km
a',b' = 17.5, 10.6 km
X0,Y0 = -1478.4, 7.3 km
Mean diameter = 27 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.

Check Johnston Archive for satellites.

Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : 553f0c10-8957-11ef-78cd-f9192fbebca9 [asteroids]

 Occultation Date + Time   : 2025-04-02 at 20:07:53 UT +/- 0.0 min  [1]
 Object Designation        : (3560) Chenqian
 Orbit Class               : MBA
 Star Designation          : GDR3 3786149839067447424
 Star Coordinates (ICRF)   : RA = 11 29 20.7075, DE = -04 54 59.110  [2]
 Star Magnitudes           : G = 14.66 mag, RP = 14.14 mag, BP = 15.02 mag
 Object Magnitude          : V = 16.17 mag
 Estimated Magnitude Drop  : 1.8 mag
 Estimated Max. Duration   : 2.3 sec
 Object Mean Diameter      : 29.9 km  (src: astorb)
 Speed of the shadow       : 13.3 km/s
 Elongation to Moon & Sun  : 101° (sunlit = 26%), Sun = 160°
 Cross-track uncertainty   : 1.0 mas = 1 km = 0.06 path-width (1-sig)
 RUWE and duplicate source : 0.98 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#57

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

More Data and Informations
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