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2022-08-03 / 4UC 457-108312 / (1505) Koranna

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jiri Polak O+ CCD M303 CZ GPS++ 22:54:57 22:56:58.58 22:57:01.98 22:58:57 0.05 0.05 3.40 35.4
2 show Jan Gebel O+ VID M254 CZ GPS++ 22:56:59 22:56:58.70 22:57:02.06 22:58:59 0.16 0.16 3.36 34.9
3 show Jiri Kubanek O+ CCD M150 CZ GPS++ 22:54:55 22:56:54.51 22:56:57.66 22:58:58 0.15 0.15 3.15 32.8
4 show Michal Rottenborn O- CCD M254 CZ 22:54:58 22:58:58
5 show Jiri Kubanek O- CCD M200 CZ 22:52:55 22:56:57
6 show Jan Manek O- CCD M356 CZ 22:54:50 22:58:50
7 show Marcin Filipek O- CCD M250 PL 22:55:15 22:57:15
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#57 : 8de6f60e-fd7c-4618-b478-450e15bd6039 [db: observed]

Using prediction 8de6f60e-fd7c-4618-b478-450e15bd6039 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 = 184 x 4 km
a',b' = 92.1, 2.1 km
X0,Y0 = 551.5, 34.7 km
Mean diameter = 28 km

From 3 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: 2022-08-03, 22:56 UT (JD = 2459795.456)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 46241.04.452 317°, -72° 2.45732e62475.50.0° None2020-10-05 not scaled 2019-10-23
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] : 8de6f60e-fd7c-4618-b478-450e15bd6039 [observed]

 Occultation Date + Time   : 2022-08-03 at 22:58:38 UT +/- 0.02 min  [1]
 Object Designation        : (1505) Koranna
 Orbit Class               : MBA
 Star Designation          : GDR3 4242737062007122176
 Star Coordinates (ICRF)   : RA = 20 14 06.2480, DE = +01 20 56.671  [2]
 Star Magnitudes           : G = 12.73 mag, RP = 12.03 mag, BP = 13.26 mag
 Object Magnitude          : V = 15.07 mag
 Estimated Magnitude Drop  : 2.5 mag
 Estimated Max. Duration   : 2.0 sec
 Object Mean Diameter      : 21 km  (src: astorb)
 Speed of the shadow       : 10.4 km/s
 Elongation to Moon & Sun  : 102° (sunlit = 34%), Sun = 159°
 Cross-track uncertainty   : 4.3 mas = 4 km = 0.23 path-width (1-sig)
 RUWE and duplicate source : 2.09 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#57

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

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