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2019-07-26 / TYC 5157-01423-1 / (489) Comacina

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Peter Tickner O+ CCD M356 UK GPS 00:12:30 00:15:07.41 00:15:18.71 00:17:30 0.05 0.05 11.30 150.3
2 show Peter Birtwhistle O+ CCD M405 UK NTP 00:14:50 00:15:10.19 00:15:19.76 00:15:50 0.06 0.06 9.57 127.3
3 show Tim Haymes O+ VID M203 UK GPS++ 00:14:32 00:15:06.98 00:15:18.04 00:15:50 0.04 0.02 11.06 147.1
4 show Adrian Jones O+ VID M303 UK GPS++ 00:13:09 00:15:06.43 00:15:17.67 00:17:05 0.04 0.02 11.24 149.5
5 show John Talbot O+ VID M303 UK GPS++ 00:13:10 00:15:09.42 00:15:18.41 00:17:09 0.02 0.02 8.99 119.6
6 show Henk Bulder O- VIS M305 NL 00:12:45 00:16:00
UT1/UT4: Begin/End of observation | UT2/UT3: Begin/End of occultation | Dur: Reported duration in seconds | Chrd: Corresponding chord length in km | More

6 observations found in db: euraster

Available (probably) matching predictions (click on the link to switch):
JPL#134 : d0849924-3f51-4067-9c43-9ee810881947 [db: observed]

Using prediction d0849924-3f51-4067-9c43-9ee810881947 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 = 155 x 63 km
a',b' = 77.3, 31.5 km
X0,Y0 = 1885.9, 40.8 km
Mean diameter = 99 km

From 5 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: 2019-07-26, 00:15 UT (JD = 2458690.510)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 809None9.023 88°, -43° 2.445801e612889.50.0° NoneNone not scaled 2016-01-04
# 810None9.023 265°, -16° 2.445801e612889.50.0° 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] : d0849924-3f51-4067-9c43-9ee810881947 [observed]

 Occultation Date + Time   : 2019-07-26 at 00:18:45 UT +/- 0.02 min  [1]
 Object Designation        : (489) Comacina
 Orbit Class               : MBA
 Star Designation          : GDR3 4196629793510632832
 Star Coordinates (ICRF)   : RA = 19 44 33.1424, DE = -06 53 58.720  [2]
 Star Magnitudes           : G = 10.01 mag, RP = 9.0 mag, BP = 11.06 mag
 Object Magnitude          : V = 13.38 mag
 Estimated Magnitude Drop  : 3.4 mag
 Estimated Max. Duration   : 10.5 sec
 Object Mean Diameter      : 139 km  (src: astorb)
 Speed of the shadow       : 13.3 km/s
 Elongation to Moon & Sun  : 108° (sunlit = 41%), Sun = 165°
 Cross-track uncertainty   : 1.0 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#134

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

More Data and Informations
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