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2018-12-28 / 4UC 498-040974 / (95) Arethusa

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Fausto Delucchi O+ VIS M300 CH RAD 00:00:10 00:01:11.90 00:01:14.02 00:04:00 0.5 0.5 2.12 26.5
2 show Alberto Ossola O+ VID M230 CH GPS++ 23:59:30 00:01:08.60 00:01:14.72 00:02:30 0.08 0.04 6.12 76.5
3 show Andrea Manna O+ VID M200 CH GPS++ 23:56:51 00:01:07.65 00:01:15.25 00:03:06 0.04 0.04 7.60 95.0
4 show Stefano Sposetti O+ VID M280 CH GPS++ 23:56:08 00:01:06.73 00:01:14.71 00:04:07 0.02 0.02 7.98 99.8
5 show Martin Mutti O+ VID M320 CH GPS++ 00:01:00 00:01:12.52 00:01:22.48 00:01:30 0.02 0.02 9.96 124.5
6 show E. Frappa/A. Klotz O- CCD M250 FR 00:00:44 00:04:03
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

6 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#63 : a0e0e4e1-2c93-45f6-8d61-81cc9e4f3624 [db: observed]
JPL#63 : 18d32523-92c7-46a2-9ec2-d5b6df6e1ba4 [db: observed]
JPL#63 : 4178cda0-cbec-4732-8d70-0cbac1c48819 [db: observed]

Using prediction a0e0e4e1-2c93-45f6-8d61-81cc9e4f3624 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 = 166 x 128 km
a',b' = 82.9, 64.1 km
X0,Y0 = 774.9, 29.1 km
Mean diameter = 146 km

From 5 chords (VID,VIS)








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: 2018-12-28, 00:01 UT (JD = 2458480.501)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 294None8.702 149°, 33° 2.444085e614395.50.0° None2011-04-11 147.0 +/- 32.0 km 2011-02-16
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] : a0e0e4e1-2c93-45f6-8d61-81cc9e4f3624 [observed]

 Occultation Date + Time   : 2018-12-28 at 00:02:00 UT +/- 0.01 min  [1]
 Object Designation        : (95) Arethusa
 Orbit Class               : MBA
 Star Designation          : GDR3 3156207088842105088
 Star Coordinates (ICRF)   : RA = 07 10 23.8285, DE = +09 24 05.103  [2]
 Star Magnitudes           : G = 11.62 mag, RP = 10.83 mag, BP = 12.3 mag
 Object Magnitude          : V = 12.11 mag
 Estimated Magnitude Drop  : 1.0 mag
 Estimated Max. Duration   : 10.9 sec
 Object Mean Diameter      : 136 km  (src: astorb)
 Speed of the shadow       : 12.5 km/s
 Elongation to Moon & Sun  : 62° (sunlit = 66%), Sun = 163°
 Cross-track uncertainty   : 2.7 mas = 3 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 1.04 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#63

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

More Data and Informations
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