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2021-03-22 / 4UC 631-045424 / (596) Scheila

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Paolo Fini O+ CCD M305 IT GPS++ 20:58:57 20:59:31.81 20:59:50.83 21:00:53 0.52 0.24 19.02 93.2
2 show Mauro Bertini O+ CCD M300 IT GPS 20:58:00 20:59:33.50 20:59:49.50 21:00:55 1.50 1.50 16.00 78.4
3 show Peter Nosal O+ CCD M250 SK NTP+ 20:55:00 20:56:57.60 20:57:14.59 21:00:17 0.50 0.50 16.99 83.3
4 show Marek Harman O+ CCD M250 SK NTP+ 20:55:37 20:57:00.45 20:57:08.11 20:59:17 0.35 0.35 7.66 37.5
5 show Paolo Bacci O- CCD M600 IT 20:57:00 21:02:00
6 show Daniel Blazewicz O- CCD M350 PL 20:54:30 20:59:43
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#104 : 23d6eea8-788f-46f1-9010-e0a1424aeb45 [db: observed]

Using prediction 23d6eea8-788f-46f1-9010-e0a1424aeb45 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 = 108 x 92 km
a',b' = 53.9, 45.9 km
X0,Y0 = -284.8, 28.9 km
Mean diameter = 99 km

From 4 chords (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: 2021-03-22, 20:59 UT (JD = 2459296.374)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 848None15.867 264°, -18° 2.451041e68255.40.0° NoneNone not scaled 2016-01-04
# 849None15.867 89°, -9° 2.451041e68255.40.0° NoneNone not scaled 2016-01-04
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] : 23d6eea8-788f-46f1-9010-e0a1424aeb45 [observed]

 Occultation Date + Time   : 2021-03-22 at 21:04:08 UT +/- 0.05 min  [1]
 Object Designation        : (596) Scheila
 Orbit Class               : MBA
 Star Designation          : GDR3 0717084960898192256
 Star Coordinates (ICRF)   : RA = 08 54 33.5438, DE = +36 11 06.849  [2]
 Star Magnitudes           : G = 14.14 mag, RP = 13.56 mag, BP = 14.58 mag
 Object Magnitude          : V = 14.02 mag
 Estimated Magnitude Drop  : 0.7 mag
 Estimated Max. Duration   : 23.2 sec
 Object Mean Diameter      : 113 km  (src: astorb)
 Speed of the shadow       : 4.9 km/s
 Elongation to Moon & Sun  : 24° (sunlit = 62%), Sun = 122°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.01 path-width (1-sig)
 RUWE and duplicate source : 0.97 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#104

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

More Data and Informations
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