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2023-10-03 / UCAC4 602-025800 / (407) Arachne

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Stefan Meister O+ VID M500 CH GPS 04:07:39 04:08:05.995 04:08:07.995 04:08:39 0.194 0.194 2.00 22.2
2 show Gregor Krannich O+ VID M350 DE GPS 04:07:03 04:08:19.786 04:08:30.890 04:10:03 1.051 1.051 11.10 123.2
3 show Karl-Ludwig Bath O- CCD T180 DE NTP 04:06:05 04:11:05
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#67 : 9097d3d1-efd6-4105-90da-37ddc7d89cd4 [db: observed]
JPL#67 : 0ceac132-52eb-4173-a355-1fdad18114ae [db: observed]

Using prediction 9097d3d1-efd6-4105-90da-37ddc7d89cd4 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 = 146.1, 38.3 km
Circular diameter = 130 km

From 2 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.

Sky projection (artificial light) for occ. time: 2023-10-03, 04:08 UT (JD = 2460220.672)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 813None22.626 43°, -58° 2.446447e613773.70.0° NoneNone not scaled 2016-01-04
# 814None22.626 241°, -63° 2.446447e613773.70.0° 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] : 9097d3d1-efd6-4105-90da-37ddc7d89cd4 [observed]

 Occultation Date + Time   : 2023-10-03 at 04:08:35 UT +/- 0.02 min  [1]
 Object Designation        : (407) Arachne
 Orbit Class               : MBA
 Star Designation          : GDR3 3443960899721828480
 Star Coordinates (ICRF)   : RA = 05 52 18.4627, DE = +30 13 30.473  [2]
 Star Magnitudes           : G = 15.07 mag, RP = 14.38 mag, BP = 15.59 mag
 Object Magnitude          : V = 13.91 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 8.6 sec
 Object Mean Diameter      : 95 km  (src: astorb)
 Speed of the shadow       : 11.1 km/s
 Elongation to Moon & Sun  : 29° (sunlit = 82%), Sun = 101°
 Cross-track uncertainty   : 1.3 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.01 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#67

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

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