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2022-04-21 / 4UC 371-181139 / (334) Chicago

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Olivier Schreurs O+ VID M406 BE GPS++ 03:46:17 03:47:14.54 03:47:20.30 03:48:18 1.03 1.03 5.76 125.0
2 show Simon Kidd O+ CCD M350 UK GPS++ 03:47:09 03:47:06.46 03:47:14.30 03:48:10 0.12 0.12 7.84 170.1
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

2 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#183 : c00d7497-9f0b-4583-880a-af70c86ea996 [db: observed]

Using prediction c00d7497-9f0b-4583-880a-af70c86ea996 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 = 1455.0, 25.3 km
Circular diameter = 182 km

From 2 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: 2022-04-21, 03:46 UT (JD = 2459690.657)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 42691.07.360 21°, 20° 2.450924e68766.70.0° None2019-09-26 not scaled 2019-05-07
# 42701.07.360 200°, 32° 2.450924e68766.70.0° None2019-09-26 not scaled 2019-05-07
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] : c00d7497-9f0b-4583-880a-af70c86ea996 [observed]

 Occultation Date + Time   : 2022-04-21 at 03:48:23 UT +/- 0.02 min  [1]
 Object Designation        : (334) Chicago
 Orbit Class               : MBA
 Star Designation          : GDR3 6883310198560290560
 Star Coordinates (ICRF)   : RA = 21 00 49.3807, DE = -15 59 25.170  [2]
 Star Magnitudes           : G = 12.49 mag, RP = 11.78 mag, BP = 13.06 mag
 Object Magnitude          : V = 14.38 mag
 Estimated Magnitude Drop  : 2.1 mag
 Estimated Max. Duration   : 7.2 sec
 Object Mean Diameter      : 156 km  (src: astorb)
 Speed of the shadow       : 21.7 km/s
 Elongation to Moon & Sun  : 43° (sunlit = 76%), Sun = 78°
 Cross-track uncertainty   : 1.7 mas = 4 km = 0.03 path-width (1-sig)
 RUWE and duplicate source : 0.96 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#183

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

More Data and Informations
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