Year: 2010
Type: article
Abstract: 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 size estimate from Brown & Trujillo. We find, from a mean of available published size estimates, a diameter for Quaoar of 890 ± 70 km. We find Quaoar's density to be ρ = 4.2 ± 1.3gcm -3 , possibly the highest density in the Kuiper Belt.
Source: The Astrophysical Journal
Authors: Wesley C. Fraser, Michael E. Brown
Institution: California Institute of Technology
Language: English
Topic: Astro and Planetary Science
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2171402508