Occultation event
Quaoar
event on 2012-02-17
685
Radius (km)
0.124
Geometric albedo
2
Positive chords
France, Switzerland
Observed from
3D modelQuaoar · interactive
Downloads 4.6 MB
Model of the occulting body, not a product of this event — a reconstruction, not a direct measurement. The values below are what this occultation measured.
Size — to scalevs Pluto
QUAOAR · R 685 KMPLUTO · R 1188 KM
Quaoar — this objectPluto — comparison
Physical properties
Radius eq. (km)685 ± 445/-155
Equivalent radius (km)543 ± 2
Oblateness0
Axis ratios (b/a · c/a)—
Density (g/cm³)1.99 ± 0.46
ShapeMaclaurin
Albedo (V)0.124 ± 0.006
Orbit — top viewheliocentric
43.5
a (AU)
0.041
e
8
i (deg)
Occultation record
Event date2012-02-17
Observed fromFrance, Switzerland
Positive chords2
KindMain
Delta (au)43.52
Star G mag.—
Object G mag.21.778
Astrometryfeeds NIMA ephemeris
Position Date (JD)2455974.68750
RA position17 34 21.842097
Error RA·cos(δ) (mas)0.26
DEC position−15 42 10.33151
Error DEC (mas)0.22
Where on the skyThe published position of this event, against the constellations.
Chart data: d3-celestial (BSD-3-Clause), from Hipparcos / Yale BSC and the IAU figures. Position J2000.
Atmosphere
Pressure (nbar)no
Atm. gas—
Reference & provenance
Lucky Star projectYes
ReferenceRommel et al, A&A, 644, A40, 2020
CommentDave Herald and John Newmann report.