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2018-02-17 / TYC 4983-00858-1 / (924) Toni

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Peter Tickner O+ CCD M300 UK NTP 04:28:02 04:31:01.80 04:31:15.66 04:31:45 0.20 0.15 13.86 79.0
2 show Simon Kidd O+ CCD M350 UK NTP 04:29:31 04:31:12.05 04:31:27.06 04:32:13 0.04 0.04 15.01 85.6
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#61 : 6d3894a8-5bba-4b60-95cc-1ccbecdbd9cc [db: observed]

Using prediction 6d3894a8-5bba-4b60-95cc-1ccbecdbd9cc 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 = 2646.7, 9.0 km
Circular diameter = 83 km

From 2 chords (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: 2018-02-17, 04:30 UT (JD = 2458166.688)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 58471.019.437 40°, 32° 2.457249e6917.70.0° None2020-10-05 not scaled 2019-10-23
# 58481.019.438 214°, 37° 2.457249e6917.70.0° 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] : 6d3894a8-5bba-4b60-95cc-1ccbecdbd9cc [observed]

 Occultation Date + Time   : 2018-02-17 at 04:21:20 UT +/- 0.02 min  [1]
 Object Designation        : (924) Toni
 Orbit Class               : MBA
 Star Designation          : GDR3 3642321657886668544
 Star Coordinates (ICRF)   : RA = 14 21 55.2374, DE = -05 39 19.791  [2]
 Star Magnitudes           : G = 10.97 mag, RP = 10.28 mag, BP = 11.5 mag
 Object Magnitude          : V = 15.43 mag
 Estimated Magnitude Drop  : 4.5 mag
 Estimated Max. Duration   : 15.1 sec
 Object Mean Diameter      : 86 km  (src: astorb)
 Speed of the shadow       : 5.7 km/s
 Elongation to Moon & Sun  : 128° (sunlit = 2%), Sun = 113°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 0.95 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#61

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

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