The Size and Shape of the Oblong Dwarf Planet Haumea

  title={The Size and Shape of the Oblong Dwarf Planet Haumea},
  author={Alexandra C. Lockwood and Michael E. Brown and J. Stansberry},
  journal={Earth, Moon, and Planets},
Abstract We use thermal radiometry and visible photometry to constrain the size, shape, and albedo of the large Kuiper belt object Haumea. The correlation between the visible and thermal photometry demonstrates that Haumea’s high amplitude and quickly varying optical light curve is indeed due to Haumea’s extreme shape, rather than large scale albedo variations. However, the well-sampled high precision visible data we present does require longitudinal surface heterogeneity to account for the… Expand

Figures and Tables from this paper

The size, shape, density and ring of the dwarf planet Haumea from a stellar occultation
Observations from multiple Earth-based observatories of Haumea passing in front of a distant star (a multi-chord stellar occultation) report the presence of a ring with an opacity of 0.5, which constrains the three-dimensional orientation of Haumesa and its triaxial shape, which is inconsistent with a homogeneous body in hydrostatic equilibrium. Expand
Haumea’s thermal emission revisited in the light of the occultation results
Abstract A recent multi-chord occultation measurement of the dwarf planet (136108) Haumea (Ortiz et al., 2017) revealed an elongated shape with the longest axis comparable to Pluto’s mean diameter.Expand
Haumea’s Shape, Composition, and Internal Structure
We have calculated the figure of equilibrium of a rapidly rotating, differentiated body to determine the shape, structure, and composition of the dwarf planet Haumea. Previous studies of Haumea'sExpand
Modeling transit and reflected light curves for non-spherical exoplanets
A new algorithm to model variations in transit light curves induced by ellipsoidal exoplanets is presented, which will be ultimately released to the community as a MATLAB-based package. Expand
Trans-Neptunian objects and Centaurs at thermal wavelengths
Abstract The thermal emission of Trans-Neptunian objects and Centaurs has been observed at mid- and far-infrared wavelengths—with the biggest contributions coming from the Spitzer and Herschel spaceExpand
The near-equilibrium figure of the dwarf planet Haumea and possible mechanism of origin of its satellites
The purpose of this paper consists in constructing the near-equilibrium model of the dwarf planet Haumea and developing the latent mechanism of accumulation of icy masses at sharp ends of the rapidlyExpand
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.Expand
Size and shape of a celestial body, definition of a planet
Experience shows that celestial bodies have a nearly round shape only from a certain size. At IAU resolution B5, item b, that shape serves as an indicator for a distinct mechanism of its forming,Expand
The Short Rotation Period of Hi'iaka, Haumea's Largest Satellite
Hi'iaka is the larger outer satellite of the dwarf planet Haumea. Using relative photometry from the Hubble Space Telescope and Magellan and a phase dispersion minimization analysis, we haveExpand
Rotational properties of the Haumea family members and candidates: Short-term variability
Haumea is one of the most interesting and intriguing transneptunian objects (TNOs). It is a large, bright, fast rotator, and its spectrum indicates nearly pure water ice on the surface. It has atExpand


Photometric Observations Constraining the Size, Shape, and Albedo of 2003 EL61, a Rapidly Rotating, Pluto-sized Object in the Kuiper Belt
We present measurements at optical wavelengths of the spectral reflectance, rotational light curve, and solar phase curve of 2003 EL61. With apparent visual magnitude 17.5 at 51 AU from the Sun, thisExpand
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 rangeExpand
High-Precision Photometry of Extreme KBO 2003 EL61
We present high-precision, time-resolved, visible and near-infrared photometry of the large (diameter ~ 2500 km) Kuiper belt object (136108) 2003 EL61. The new data confirm rapid rotation at period PExpand
"TNOs are cool": A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea
Thermal emission from Kuiper Belt object (136108) Haumea was measured with Herschel-PACS at 100 and 160 micrometers for almost a full rotation period. Observations clearly indicate a 100-micrometerExpand
Densities of Solar System Objects from Their Rotational Light Curves
We present models of the shapes of four Kuiper Belt objects (KBOs) and the Jovian Trojan asteroid (624) Hektor as ellipsoidal figures of equilibrium and Roche binaries. Our simulations select thoseExpand
Time-Resolved Near-Infrared Photometry of Extreme Kuiper Belt Object Haumea
We present time-resolved near-infrared (J and H) photometry of the extreme Kuiper belt object (136108) Haumea (formerly 2003 EL61) taken to further investigate rotational variability of this object.Expand
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 dwarfExpand
High-contrast observations of (136108) Haumea. A crystalline water-ice multiple system
Context. The trans-Neptunian region of the Solar System is populated by a wide variety of icy bodies showing great diversity in orbital behavior, size, surface color, and composition. One can alsoExpand
Voyager Disk-Integrated Photometry of Triton
Hapke's photometric model has been combined with a plane-parallel thin atmospheric haze model to describe Voyager whole-disk observations of Triton, in the violet, blue, and green wavelength bands, to obtain estimates ofTriton's geometricAlbedo, phase integral, and Bond albedo. Expand
The Formation of the Collisional Family Around the Dwarf Planet Haumea
Haumea, a rapidly rotating elongated dwarf planet ({approx}1500 km in diameter), has two satellites and is associated with a 'family' of several smaller Kuiper Belt objects (KBOs) in similar orbits.Expand