English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using precise relative astrometry from the Hubble Space Telescope and the W.M. Keck Telescope, we have determined the orbits and masses of the twodynamically interacting satellites of the dwarf planet (136108) Haumea,formerly 2003 EL61. The orbital parameters of Hi'iaka, the outer, brightersatellite, match well the previously derived orbit. On timescales longer than afew weeks, no Keplerian orbit is sufficient to describe the motion of theinner, fainter satellite Namaka. Using a fully-interacting three point-massmodel, we have recovered the orbital parameters of both orbits and the mass ofHaumea and Hi'iaka; Namaka's mass is marginally detected. The data are notsufficient to uniquely determine the gravitational quadrupole of thenon-spherical primary (described by $J_2$). The nearly co-planar nature of thesatellites, as well as an inferred density similar to water ice, strengthen thehypothesis that Haumea experienced a giant collision billions of years ago. Theexcited eccentricities and mutual inclination point to an intriguing tidalhistory of significant semi-major axis evolution through satellite mean-motionresonances. The orbital solution indicates that Namaka and Haumea are currentlyundergoing mutual events and that the mutual event season will last for thenext several years.

Orbits and Masses of the Satellites of the Dwarf Planet Haumea = 2003 EL61