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2020-01-16 / TYC 1372-01714-1 / (407) Arachne

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jerry Bardecker O+ VID M305 US GPS++ 03:25:07 03:26:29.99 03:26:34.75 03:29:00 0.01 0.01 4.76 58.5
2 show Pietro Baruffetti O+ VID M300 IT GPS++ 03:13:50 03:14:50.21 03:14:58.67 03:16:26 0.04 0.04 8.46 104.1
3 show Pierre Le Cam O- CCD M250 FR 03:12:30 03:18:31
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: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#67 : 4902a228-ac5b-4427-a688-c703767a7d38 [db: observed]

Using prediction 4902a228-ac5b-4427-a688-c703767a7d38 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 = 139.5, 7.3 km
Circular diameter = 108 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: 2020-01-16, 03:26 UT (JD = 2458864.643)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 813None22.626 43°, -58° 2.446447e612417.60.0° NoneNone not scaled 2016-01-04
# 814None22.626 241°, -63° 2.446447e612417.60.0° 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] : 4902a228-ac5b-4427-a688-c703767a7d38 [observed]

 Occultation Date + Time   : 2020-01-16 at 03:20:33 UT +/- 0.01 min  [1]
 Object Designation        : (407) Arachne
 Orbit Class               : MBA
 Star Designation          : GDR3 0865635132204436480
 Star Coordinates (ICRF)   : RA = 07 31 52.3866, DE = +22 10 07.001  [2]
 Star Magnitudes           : G = 9.02 mag, RP = 8.25 mag, BP = 9.68 mag
 Object Magnitude          : V = 12.62 mag
 Estimated Magnitude Drop  : 3.6 mag
 Estimated Max. Duration   : 7.8 sec
 Object Mean Diameter      : 95 km  (src: astorb)
 Speed of the shadow       : 12.3 km/s
 Elongation to Moon & Sun  : 76° (sunlit = 66%), Sun = 176°
 Cross-track uncertainty   : 1.7 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.04 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

More Data and Informations
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