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2016-02-16 / 1UT618-161987 / (423) Diotima

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jean Lecacheux O+ VID L67 FR GPS++ 03:58:51 03:59:11.34 03:59:29.20 04:03:01 0.10 0.15 17.86 101.8
2 show Tim Haymes O+ VID M203 UK GPS++ 03:56:00 03:59:19.4 03:59:49.1 04:02:00 0.16 0.32 29.70 169.3
3 show John Talbot O+ VID M303 UK GPS++ 03:57:18 03:59:20.62 03:59:49.78 04:01:18 0.16 0.04 29.16 166.2
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#137 : 24a562e8-71d7-46da-822a-f408287b9509 [db: observed]

Using prediction 24a562e8-71d7-46da-822a-f408287b9509 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 = 216 x 154 km
a',b' = 107.8, 77.0 km
X0,Y0 = 324.0, 24.6 km
Mean diameter = 182 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.

Sky projection (artificial light) for occ. time: 2016-02-16, 03:59 UT (JD = 2457434.666)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 2173.04.775 351°, 4° 2.444826e612608.70.0° None2017-04-03 194.0 +/- 18.0 km 2007-02-27
# 1836None4.775 354°, 0° 2.444826e612608.70.0° None2017-07-11 209.0 +/- 7.0 km 2017-07-11
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] : 24a562e8-71d7-46da-822a-f408287b9509 [observed]

 Occultation Date + Time   : 2016-02-16 at 04:11:52 UT +/- 0.01 min  [1]
 Object Designation        : (423) Diotima
 Orbit Class               : MBA
 Star Designation          : GDR3 0937590918336861056
 Star Coordinates (ICRF)   : RA = 06 53 04.9036, DE = +33 24 58.105  [2]
 Star Magnitudes           : G = 12.83 mag, RP = 12.19 mag, BP = 13.31 mag
 Object Magnitude          : V = 12.61 mag
 Estimated Magnitude Drop  : 0.7 mag
 Estimated Max. Duration   : 36.4 sec
 Object Mean Diameter      : 209 km  (src: astorb)
 Speed of the shadow       : 5.7 km/s
 Elongation to Moon & Sun  : 37° (sunlit = 60%), Sun = 133°
 Cross-track uncertainty   : 1.3 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.08 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#137

 Object is a Gaia mass determination target !

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

More Data and Informations
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