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2025-01-06 / UCAC4 651-015575 / (1266) Tone

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Simon Kidd O+ VID M350 GB GPS 23:01:00 23:01:45.930 23:01:50.420 23:03:00 0.02 0.02 4.49 45.3
2 show Luke Broom-Lynne O+ VID M250 GB GPS 23:01:13 23:01:37.550 23:01:42.590 23:02:13 0.08 0.08 5.04 50.9
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: sodis

Available (probably) matching predictions (click on the link to switch):
JPL#65 : b69672b0-86f4-11ef-78cd-3385feeb8f6a [db: asteroids]
JPL#65 : 31bff6f0-82f4-11ef-6618-562edbf2b337 [db: asteroids]

Using prediction b69672b0-86f4-11ef-78cd-3385feeb8f6a 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 = -1432.0, 31.1 km
Circular diameter = 63 km

From 2 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: 2025-01-06, 23:00 UT (JD = 2460682.458)

DAMITQP (h)λ, βJD0JD-JD0φ0VersionModifiedVol-equiv DCmnt
# 45181.015.562 65°, -19° 2.457512e63170.50.0° 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] : b69672b0-86f4-11ef-78cd-3385feeb8f6a [asteroids]

 Occultation Date + Time   : 2025-01-06 at 23:06:06 UT +/- 0.02 min  [1]
 Object Designation        : (1266) Tone
 Orbit Class               : MBA
 Star Designation          : GDR3 0236656035205033984
 Star Coordinates (ICRF)   : RA = 03 34 38.5909, DE = +40 03 23.725  [2]
 Star Magnitudes           : G = 12.75 mag, RP = 12.15 mag, BP = 13.19 mag
 Object Magnitude          : V = 15.26 mag
 Estimated Magnitude Drop  : 2.6 mag
 Estimated Max. Duration   : 7.2 sec
 Object Mean Diameter      : 73 km  (src: astorb)
 Speed of the shadow       : 10.1 km/s
 Elongation to Moon & Sun  : 47° (sunlit = 50%), Sun = 131°
 Cross-track uncertainty   : 0.7 mas = 1 km = 0.02 path-width (1-sig)
 RUWE and duplicate source : 1.0 mas, dup.src = 1  (0:false, 1:true)

 Ephemeris Reference       : JPL#65

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

More Data and Informations
SiMDA | 3D Asteroid Catalogue | Johnston Archive | Star at CDS (Vizier) | JPL Small-Body Node | Minor Planet Center | Wikipedia
(If error 404: link not valid which means no data available)

Aladin Sky Atlas
Aladin Lite direct link (has Gaia overlay)