author={Wesley C. Fraser and M. E. Brown},
  journal={The Astrophysical Journal},
  • W. Fraser, M. Brown
  • Published 1 September 2009
  • Physics, Geology
  • The Astrophysical Journal
Here we report Wide-Field Planetary Camera 2 observations of the Quaoar-Weywot Kuiper Belt binary. From these observations, we find that Weywot is on an elliptical orbit with an eccentricity of 0.14 ± 0.04, a period of 12.438 ± 0.005 days, and a semimajor axis of 1.45 ± 0.08 × 10^4 km. The orbit reveals a surprisingly high-Quaoar-Weywot system mass of (1.6 ± 0.3) × 10^(21) kg. Using the surface properties of the Uranian and Neptunian satellites as a proxy for Quaoar's surface, we reanalyze the… 

Figures and Tables from this paper

The mass, orbit, and tidal evolution of the Quaoar–Weywot system
“TNOs are Cool”: A survey of the trans-Neptunian region
Trans-Neptunian objects (TNO) represent the leftovers of the formation of the Solar System. Their physical properties provide constraints to the models of formation and evolution of the various
Interpreting the densities of the Kuiper belt's dwarf planets
Kuiper Belt objects with absolute magnitude less than 3 (radius $\gtrsim$500 km), the dwarf planets, have a range of different ice/rock ratios, and are more rock-rich than their smaller counterparts.
Orbits and Masses of the Satellites of the Dwarf Planet Haumea (2003 EL61)
Using precise relative astrometry from the Hubble Space Telescope and the W. M. Keck Telescope, we have determined the orbits and masses of the two dynamically interacting satellites of the dwarf
The Compositions of Kuiper Belt Objects
Objects in the Kuiper belt are difficult to study in detail, even with the best telescopes available. Therefore, for many years, studies of the compositions of these objects were relegated to
Rotational properties of the binary and non-binary populations in the Trans-Neptunian belt
We present results for the short-term variability of Binary Trans-Neptunian Objects (BTNOs). We performed CCD photometric observations using the 3.58 m Telescopio Nazionale Galileo, the 1.5 m Sierra
Towards initial mass functions for asteroids and Kuiper Belt Objects
The Ices on Transneptunian Objects and Centaurs
Transneptunian objects (TNOs) and Centaurs are small bodies orbiting the Sun in the cold outer regions of the Solar System. TNOs include Pluto and its satellite Charon, and Neptune’s large satellite
Density of asteroids


Direct Measurement of the Size of the Large Kuiper Belt Object (50000) Quaoar
We imaged the recently discovered bright Kuiper belt object (50000) Quaoar with the Hubble Space Telescope High Resolution Camera to directly determine its size. The point-spread function (PSF) of
The albedo, size, and density of binary kuiper belt object (47171) 1999 TC36
We measured the system-integrated thermal emission of the binary Kuiper Belt object (47171 ) 1999 TC36, at wavelengths near 24 and 70 μm using the Spitzer Space Telescope. We fit these data and the
Crystalline water ice on the Kuiper belt object (50000) Quaoar
It is concluded that Quaoar has been recently resurfaced, either by impact exposure of previously buried (shielded) ices or by cryovolcanic outgassing, or by a combination of these processes.
NICMOS Photometry of the Unusual Dwarf Planet Haumea and its Satellites
We present here Hubble Space Telescope NICMOS F110W and F160W observations of Haumea, and its two satellites Hi'iaka and Namaka. From the measured (F110W-F160W) colors of –1.208 ± 0.004, –1.48 ±
Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope
Abstract Photometric properties of 4 rings and 16 satellites of Uranus are presented, based on 41 Hubble Space Telescope images taken in 1997. Up to 25 filters per object covered the wavelength range
Rotational brightness variations in Trans-Neptunian Object 50000 Quaoar
Time-resolved broad-band CCD photometry of Trans-Neptunian Object 50000 Quaoar carried out using the 1.5 m telescope at Sierra Nevada Observatory is presented. The lightcurve reveals short-term
Physical Properties of Kuiper Belt and Centaur Objects: Constraints from the Spitzer Space Telescope
Detecting heat from minor planers in the outer solar system is challenging, yet it is the most efficient means for constraining the albedos and sizes of Kuiper belt objects (KBOs) and their progeny,
High albedos of low inclination Classical Kuiper belt objects