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2011-09-13 / TYC 1866-01091-1 / (177) Irma

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Simone Bolzoni O+ VIS M300 IT RAD 01:48:05 01:50:47.60 01:50:50.80 01:53:20 0.20 0.20 3.20 69.1
2 show GB Casalnuovo et al O+ VID M300 IT NTP 01:46:49 01:50:56.7 01:50:59.6 01:51:19 2.90 62.6
3 show Stefan Gajdos O+ CCD M600 SK NTP 01:50:51 01:51:14.87 01:51:18.24 01:51:51 1.00 1.00 3.37 72.8
4 show O. Canales/F. Campos O+1 VID M203 ES GPS++ 01:48:38 01:50:18.95 01:50:22.53 01:51:47 0.02 0.02 3.58 77.3
5 show O. Canales/F. Campos O+2 VID M203 ES GPS++ 01:48:38 01:50:19.23 01:50:22.67 01:51:47 0.02 0.02 3.44 74.3
6 show E. Frappa/A. Klotz O- CCD M250 FR 01:49:58 01:53:09
7 show Andrea Manna O- VIS M300 CH 01:46:15 02:02:20
8 show Stefano Sposetti O- VID M280 CH 01:42:55 02:00:00
9 show Gerhard Dangl O- VID M254 AT 01:50:30 01:52:06
10 show Peter Delincak O- CCD M355 SK 01:45:00 01:55:00
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

10 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#115 : 495f1144-c0fb-4e6e-ba57-a4eb27aa8816 [db: observed]
JPL#115 : e367b3f6-919f-4acb-9a00-6f2c0fa985c6 [db: observed]

Using prediction 495f1144-c0fb-4e6e-ba57-a4eb27aa8816 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 = 234 x 26 km
a',b' = 116.8, 12.8 km
X0,Y0 = 150.5, 37.1 km
Mean diameter = 77 km

From 5 chords (VID,VIS,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).
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Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : 495f1144-c0fb-4e6e-ba57-a4eb27aa8816 [observed]

 Occultation Date + Time   : 2011-09-13 at 01:53:39 UT +/- 0.01 min  [1]
 Object Designation        : (177) Irma
 Orbit Class               : MBA
 Star Designation          : GDR3 3428617249315895808
 Star Coordinates (ICRF)   : RA = 05 45 30.5305, DE = +24 47 46.089  [2]
 Star Magnitudes           : G = 9.42 mag, RP = 9.16 mag, BP = 9.55 mag
 Object Magnitude          : V = 14.14 mag
 Estimated Magnitude Drop  : 4.7 mag
 Estimated Max. Duration   : 3.4 sec
 Object Mean Diameter      : 73 km  (src: astorb)
 Speed of the shadow       : 21.6 km/s
 Elongation to Moon & Sun  : 89° (sunlit = 100%), Sun = 83°
 Cross-track uncertainty   : 0.9 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 7.06 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#115

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

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