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2020-12-31 / 4UC 452-022234 / (41) Daphne

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Peter Lindner O+ CCD M305 DE GPS++ 00:55:36 00:58:01.00 00:58:11.09 01:00:24 0.35 0.43 10.09 145.3
2 show Anna Marciniak O+ CCD M400 PL NTP 00:50:19 00:57:52.6 00:58:03.6 01:02:28 1.3 1.3 11.00 158.4
3 show William Stewart O+ VID M279 UK GPS++ 00:58:47 00:59:17.78 00:59:29.46 01:00:01 0.08 0.12 11.68 168.2
4 show Michael OConnell O+ VID M355 IE GPS++ 00:58:42 00:59:38.59 00:59:48.61 01:00:42 0.11 0.05 10.02 144.3
5 show Alex Pratt O+ VID M279 UK GPS++ 00:58:44 00:59:15.94 00:59:26.80 01:00:05 0.10 0.08 10.86 156.4
6 show Derrick Ward O- CCD M200 UK 00:57:25 01:01:26
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#152 : a92bf34d-f284-4eba-8535-f495ceefd8ff [db: observed]
JPL#152 : e294e29b-a63e-4fd3-821e-042f2dce3e4d [db: observed]
JPL#152 : 597b8f2e-33ce-4709-a971-1c72315ba16f [db: observed]

Using prediction a92bf34d-f284-4eba-8535-f495ceefd8ff 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 = 186 x 132 km
a',b' = 92.9, 66.0 km
X0,Y0 = -476.2, 18.9 km
Mean diameter = 157 km

From 5 chords (VID,CCD)








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: 2020-12-31, 00:58 UT (JD = 2459214.540)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 131None5.988 198°, -32° 2.44477179382e614442.70.0° size from AO is 186+/-27 km2013-07-23 187.0 +/- 20.0 km 2011-03-28
# 17934.05.988 200°, -32° 2.44477179382e614442.70.0° None2019-01-11 187.0 +/- 7.0 km 2018-08-24
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] : a92bf34d-f284-4eba-8535-f495ceefd8ff [observed]

 Occultation Date + Time   : 2020-12-31 at 00:59:41 UT +/- 0.0 min  [1]
 Object Designation        : (41) Daphne
 Orbit Class               : MBA
 Star Designation          : GDR3 3125524980651923328
 Star Coordinates (ICRF)   : RA = 06 45 03.6858, DE = +00 21 10.040  [2]
 Star Magnitudes           : G = 13.2 mag, RP = 12.81 mag, BP = 13.44 mag
 Object Magnitude          : V = 12.2 mag
 Estimated Magnitude Drop  : 0.4 mag
 Estimated Max. Duration   : 12.1 sec
 Object Mean Diameter      : 174 km  (src: astorb)
 Speed of the shadow       : 14.4 km/s
 Elongation to Moon & Sun  : 26° (sunlit = 99%), Sun = 157°
 Cross-track uncertainty   : 1.3 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 1.08 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#152

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

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