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2024-08-29 / UCAC4 368-183225 / (76) Freia

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Deborah Smith O+ CCD M203 ES NTP 21:38:13 21:40:15.02 21:40:22.10 21:42:13 0.18 0.18 7.08 79.3
2 show Jose Antonio de los Reyes, Sensi Pastor O+ VID M300 ES GPS 21:38:33 21:40:2.8 21:40:15.5 21:42:00 0.2 0.4 12.70 142.2
3 show Roberto Di Luca, Alboresi - Frisoni O+ VID M400 IT GPS 21:37:20 21:38:23.6 21:38:39.7 21:39:20 0.30 0.30 16.10 180.3
4 show Daniel Blazewicz O+ VID M350 PL GPS 21:33:55 21:37:30.81 21:37:43.68 21:41:00 0.09 0.12 12.87 144.1
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

4 observations found in db: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#87 : 63664d20-c355-11ef-5276-1b3f5dfbb7ec [db: observed]
JPL#87 : 63667430-c355-11ef-5276-a5efb6bfbc03 [db: observed]
JPL#85 : 762b4590-852b-11ef-78cd-273f5b64cb29 [db: asteroids]
JPL#85 : 762b4590-852b-11ef-78cd-634a7ffb9a6c [db: asteroids]

Using prediction 762b4590-852b-11ef-78cd-634a7ffb9a6c 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 = 180 x 177 km
a',b' = 89.8, 88.7 km
X0,Y0 = 346.4, -590.8 km
Mean diameter = 178 km

From 4 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: 2024-08-29, 21:40 UT (JD = 2460552.403)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 442None9.973 140°, 14° 2.44485e615702.40.0° NoneNone not scaled 2012-07-30
# 443None9.973 320°, 17° 2.44485e615702.40.0° 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] : 762b4590-852b-11ef-78cd-634a7ffb9a6c [asteroids]

 Occultation Date + Time   : 2024-08-29 at 21:40:00 UT +/- 0.02 min  [1]
 Object Designation        : (76) Freia
 Orbit Class               : MBA
 Star Designation          : GDR3 6874787785150684032
 Star Coordinates (ICRF)   : RA = 20 27 26.8346, DE = -16 25 44.608  [2]
 Star Magnitudes           : G = 13.97 mag, RP = 19.69 mag, BP = 20.86 mag
 Object Magnitude          : V = 13.86 mag
 Estimated Magnitude Drop  : 0.7 mag
 Estimated Max. Duration   : 16.5 sec
 Object Mean Diameter      : 184 km  (src: astorb)
 Speed of the shadow       : 11.2 km/s
 Elongation to Moon & Sun  : 163° (sunlit = 16%), Sun = 148°
 Cross-track uncertainty   : 5.6 mas = 11 km = 0.06 path-width (1-sig)
 RUWE and duplicate source : 1.03 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#85

 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)