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2017-09-03 / TYC 5239-00910-1 / (591) Irmgard

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Florian Signoret O+ VID M400 FR GPS++ 00:05:04 00:15:29.75 00:15:31.67 00:19:56 0.02 0.02 1.92 28.4
2 show Matthieu Conjat O+ CCD M200 FR NTP 00:13:26 00:15:28.46 00:15:31.22 00:17:26 1 1 2.76 40.8
3 show E. Frappa/A. Klotz O+ CCD M250 FR GPS++ 00:14:38 00:15:29.62 00:15:32.96 00:17:52 0.07 0.07 3.34 49.4
4 show G. Vaudescal/R. Yken O- VID M305 FR 00:14:46 00:17:00
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: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#63 : 84a14bf1-e2c2-4208-a99f-664b62c83ab0 [db: observed]

Using prediction 84a14bf1-e2c2-4208-a99f-664b62c83ab0 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 = 62 x 15 km
a',b' = 31.2, 7.3 km
X0,Y0 = 743.6, 22.4 km
Mean diameter = 30 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: 2017-09-03, 00:15 UT (JD = 2457999.510)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 55961.07.345 94°, 48° 2.457358e6641.50.0° None2020-10-05 not scaled 2019-10-23
# 55971.07.345 272°, 17° 2.457358e6641.50.0° 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] : 84a14bf1-e2c2-4208-a99f-664b62c83ab0 [observed]

 Occultation Date + Time   : 2017-09-03 at 00:17:37 UT +/- 0.0 min  [1]
 Object Designation        : (591) Irmgard
 Orbit Class               : MBA
 Star Designation          : GDR3 2621898146309443072
 Star Coordinates (ICRF)   : RA = 22 37 23.4009, DE = -07 02 12.348  [2]
 Star Magnitudes           : G = 10.4 mag, RP = 9.99 mag, BP = 10.66 mag
 Object Magnitude          : V = 14.92 mag
 Estimated Magnitude Drop  : 4.5 mag
 Estimated Max. Duration   : 3.5 sec
 Object Mean Diameter      : 52 km  (src: astorb)
 Speed of the shadow       : 14.8 km/s
 Elongation to Moon & Sun  : 36° (sunlit = 89%), Sun = 177°
 Cross-track uncertainty   : 0.8 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 7.13 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#63

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

More Data and Informations
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