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2025-01-09 / UCAC4 614-023975 / (6557) Yokonomura

#OBSObserverOccMeth.Instr.CC TSRCUT1UT2UT3UT4UT2EUT3EDur.Chrd
1 show Carles Schnabel O+ VID M400 ES GPS 23:23:38 23:25:35.54 23:25:37.14 23:27:40 0.16 0.16 1.60 13.0
2 show Jorge JUAN, Carles Schnabel O+ VID M410 ES GPS 23:22:30 23:25:37.1 23:25:39.12 23:27:07 0.2 0.16 2.02 16.4
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#51 : b94fcf30-8a8a-11ef-78cd-3b41c277d0b1 [db: asteroids]
JPL#51 : 90076d50-83e5-11ef-6618-2a3be7ef0596 [db: asteroids]

Using prediction b94fcf30-8a8a-11ef-78cd-3b41c277d0b1 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:
Circular profile fit was not successful ...








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.

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Map with groundtrack and observer stations

Event Details 
 Occultation UUID [and DB] : b94fcf30-8a8a-11ef-78cd-3b41c277d0b1 [asteroids]

 Occultation Date + Time   : 2025-01-09 at 23:28:41 UT +/- 0.01 min  [1]
 Object Designation        : (6557) Yokonomura
 Orbit Class               : MBA
 Star Designation          : GDR3 3448433644304047488
 Star Coordinates (ICRF)   : RA = 05 39 21.6542, DE = +32 44 45.202  [2]
 Star Magnitudes           : G = 14.69 mag, RP = 14.13 mag, BP = 15.07 mag
 Object Magnitude          : V = 16.5 mag
 Estimated Magnitude Drop  : 2.0 mag
 Estimated Max. Duration   : 1.3 sec
 Object Mean Diameter      : 11 km  (src: astorb)
 Speed of the shadow       : 8.1 km/s
 Elongation to Moon & Sun  : 27° (sunlit = 82%), Sun = 154°
 Cross-track uncertainty   : 0.4 mas = 0 km = 0.05 path-width (1-sig)
 RUWE and duplicate source : 1.07 mas, dup.src = 0  (0:false, 1:true)

 Ephemeris Reference       : JPL#51

 
 [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
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