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2023-05-28 / UCAC4 346-105554 / (76) Freia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Christian Weber O+ VID T203 DE GPS 23:05:54 23:06:14.300 23:06:21.500 23:06:47 0.50 0.60 7.20 103.0
2 show Anna Marciniak O+ CCD M350 PL GPS 23:03:56 23:06:00.600 23:06:09.600 23:07:56 1.00 1.00 9.00 128.7
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

2 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#78 : c9f65eda-4068-4582-9be0-eb8245cf74b8 [db: observed]

Using prediction c9f65eda-4068-4582-9be0-eb8245cf74b8 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 = -522.9, 30.1 km
Circular diameter = 136 km

From 2 chords (CCD,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: 2023-05-28, 23:06 UT (JD = 2460093.463)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 442None9.973 140°, 14° 2.44485e615243.50.0° NoneNone not scaled 2012-07-30
# 443None9.973 320°, 17° 2.44485e615243.50.0° NoneNone not scaled 2012-07-30
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] : c9f65eda-4068-4582-9be0-eb8245cf74b8 [observed]

 Occultation Date + Time   : 2023-05-28 at 23:04:17 UT +/- 0.01 min  [1]
 Object Designation        : (76) Freia
 Orbit Class               : MBA
 Star Designation          : GDR3 4118296255822222976
 Star Coordinates (ICRF)   : RA = 17 36 20.0819, DE = -20 59 38.742  [2]
 Star Magnitudes           : G = 15.31 mag, RP = 14.36 mag, BP = 16.24 mag
 Object Magnitude          : V = 13.83 mag
 Estimated Magnitude Drop  : 0.3 mag
 Estimated Max. Duration   : 12.8 sec
 Object Mean Diameter      : 184 km  (src: astorb)
 Speed of the shadow       : 14.3 km/s
 Elongation to Moon & Sun  : 92° (sunlit = 63%), Sun = 163°
 Cross-track uncertainty   : 1.0 mas = 2 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.94 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#78

 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
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