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2012-06-21 / TYC 0286-00513-1 / (489) Comacina

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Jorge Juan O+ VID M406 ES GPS++ 22:48:04 22:53:49.84 22:53:50.24 22:58:04 0.05 0.05 0.40 6.8
2 show C. Perello/A. Selva O+ VID M500 ES GPS++ 22:48:50 22:53:48.92 22:53:51.48 22:58:20 0.04 0.04 2.56 43.8
3 show Joan Rovira O+ VID M200 ES GPS++ 22:48:16 22:53:46.38 22:53:51.21 22:59:16 0.04 0.04 4.83 82.6
4 show E. Frappa/A. Klotz O- CCD M250 FR 22:52:39 22:55:55
5 show Carles Schnabel O? VID M400 ES GPS++ 22:50:01 22:53:50.37 22:53:50.53 22:56:19 0.04 0.04 0.16 2.7
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

5 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#134 : 2c937d71-dc44-43ac-971e-592a4611dcbd [db: observed]

Using prediction 2c937d71-dc44-43ac-971e-592a4611dcbd 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:
Ellipse profile fit was not successful. Trying circular fit.

Circular diameter = 104 km

From 4 chords (VID)








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: 2012-06-21, 22:52 UT (JD = 2456100.453)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 809None9.023 88°, -43° 2.445801e610299.50.0° NoneNone not scaled 2016-01-04
# 810None9.023 265°, -16° 2.445801e610299.50.0° 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] : 2c937d71-dc44-43ac-971e-592a4611dcbd [observed]

 Occultation Date + Time   : 2012-06-21 at 22:51:11 UT +/- 0.01 min  [1]
 Object Designation        : (489) Comacina
 Orbit Class               : MBA
 Star Designation          : GDR3 3898662352837596160
 Star Coordinates (ICRF)   : RA = 12 06 03.7523, DE = +07 10 10.546  [2]
 Star Magnitudes           : G = 11.38 mag, RP = 10.79 mag, BP = 11.79 mag
 Object Magnitude          : V = 14.36 mag
 Estimated Magnitude Drop  : 3.1 mag
 Estimated Max. Duration   : 8.1 sec
 Object Mean Diameter      : 139 km  (src: astorb)
 Speed of the shadow       : 17.1 km/s
 Elongation to Moon & Sun  : 62° (sunlit = 5%), Sun = 88°
 Cross-track uncertainty   : 1.0 mas = 2 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.61 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#134

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

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