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2020-07-12 / 4UC 376-174111 / (885) Ulrike

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Pierre Le Cam O+ CCD M250 FR GPS++ 22:23:46 22:25:41.13 22:25:45.94 22:27:46 0.15 0.15 4.81 37.5
2 show Pierre Le Cam O+ CCD M250 FR GPS++ 22:23:46 22:25:47.59 22:25:48.49 22:27:46 0.15 0.15 0.90 7.0
3 show Bjoern Kattentidt O+ VID M279 DE GPS++ 22:21:57 22:24:07.18 22:24:08.94 22:26:16 0.16 0.16 1.76 13.7
4 show Michal Rottenborn O+ CCD M303 CZ GPS++ 22:21:52 22:23:50.31 22:23:56.12 22:25:52 0.03 0.04 5.81 45.3
5 show Jiri Kubanek O+ CCD M203 CZ GPS++ 22:21:43 22:23:48.00 22:23:52.41 22:25:55 0.20 0.20 4.41 34.4
6 show Karel Halir O+ VID M507 CZ GPS++ 22:21:51 22:23:48.47 22:23:53.59 22:25:49 0.16 0.16 5.12 39.9
7 show Radim Neuvirt O+ VID M355 CZ GPS++ 22:22:02 22:23:36.46 22:23:40.94 22:24:59 0.16 0.16 4.48 34.9
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

7 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#66 : 38edfaa8-6e7b-42b2-9014-3f15a98658de [db: observed]

Using prediction 38edfaa8-6e7b-42b2-9014-3f15a98658de 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 = 77 x 28 km
a',b' = 38.4, 14.1 km
X0,Y0 = 2184.7, 16.9 km
Mean diameter = 46 km

From 7 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: 2020-07-12, 22:25 UT (JD = 2459043.434)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 1687None4.906 207°, -60° 2.450938e68105.40.0° NoneNone not scaled 2016-01-12
# 1688None4.906 13°, -64° 2.450938e68105.40.0° NoneNone not scaled 2016-01-12
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] : 38edfaa8-6e7b-42b2-9014-3f15a98658de [observed]

 Occultation Date + Time   : 2020-07-12 at 22:23:35 UT +/- 0.03 min  [1]
 Object Designation        : (885) Ulrike
 Orbit Class               : MBA
 Star Designation          : GDR3 6886710403909326336
 Star Coordinates (ICRF)   : RA = 20 57 48.7643, DE = -14 57 21.696  [2]
 Star Magnitudes           : G = 12.7 mag, RP = 12.31 mag, BP = 12.94 mag
 Object Magnitude          : V = 14.59 mag
 Estimated Magnitude Drop  : 2.1 mag
 Estimated Max. Duration   : 4.3 sec
 Object Mean Diameter      : 33 km  (src: astorb)
 Speed of the shadow       : 7.8 km/s
 Elongation to Moon & Sun  : 68° (sunlit = 51%), Sun = 158°
 Cross-track uncertainty   : 2.3 mas = 2 km = 0.08 path-width (1-sig)
 RUWE and duplicate source : 0.93 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#66

 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
SiMDA | 3D Asteroid Catalogue | Johnston Archive | Star at CDS (Vizier) | JPL Small-Body Node | Minor Planet Center | Wikipedia
(If error 404: link not valid which means no data available)

Aladin Sky Atlas
Aladin Lite direct link (has Gaia overlay)