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== Surface properties == |
== Surface properties == |
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[[File:Haumea |
[[File:2003 EL61 Haumea, with moons.jpg|thumb|[[Keck telescope]] image of Haumea (center), Hiʻiaka (above), and Namaka (below).]] |
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Hiʻiaka is the outer and, at roughly 310 km in diameter, the larger and brighter of the two moons.<ref name="Brown2006-discovery">{{cite journal| doi = 10.1086/501524| last1 = Brown| first1 = M. E.| author-link = Michael E. Brown| last2 = Van Dam| first2 = M. A.| last3 = Bouchez| first3 = A. H.| last4 = Le Mignant| first4 = D.| last5 = Campbell| first5 = R. D.| last6 = Chin| first6 = J. C. Y.| last7 = Conrad| first7 = A.| last8 = Hartman| first8 = S. K.| last9 = Johansson| first9 = E. M.| last10 = Lafon| first10 = R. E.| last11 = Rabinowitz| first11 = D. L. Rabinowitz| last12 = Stomski| first12 = P. J. Jr.| last13 = Summers| first13 = D. M.| last14 = Trujillo| first14 = C. A.| last15 = Wizinowich| first15 = P. L.| year = 2006| title = Satellites of the Largest Kuiper Belt Objects| journal = The Astrophysical Journal| volume = 639| issue = 1| pages = L43–L46| arxiv = astro-ph/0510029| bibcode = 2006ApJ...639L..43B| s2cid = 2578831| url = http://web.gps.caltech.edu/~mbrown/papers/ps/gab.pdf| access-date = 19 October 2011| ref = {{sfnRef|Brown Van Dam et al.|2006}} |
Hiʻiaka is the outer and, at roughly 310 km in diameter, the larger and brighter of the two moons.<ref name="Brown2006-discovery">{{cite journal| doi = 10.1086/501524| last1 = Brown| first1 = M. E.| author-link = Michael E. Brown| last2 = Van Dam| first2 = M. A.| last3 = Bouchez| first3 = A. H.| last4 = Le Mignant| first4 = D.| last5 = Campbell| first5 = R. D.| last6 = Chin| first6 = J. C. Y.| last7 = Conrad| first7 = A.| last8 = Hartman| first8 = S. K.| last9 = Johansson| first9 = E. M.| last10 = Lafon| first10 = R. E.| last11 = Rabinowitz| first11 = D. L. Rabinowitz| last12 = Stomski| first12 = P. J. Jr.| last13 = Summers| first13 = D. M.| last14 = Trujillo| first14 = C. A.| last15 = Wizinowich| first15 = P. L.| year = 2006| title = Satellites of the Largest Kuiper Belt Objects| journal = The Astrophysical Journal| volume = 639| issue = 1| pages = L43–L46| arxiv = astro-ph/0510029| bibcode = 2006ApJ...639L..43B| s2cid = 2578831| url = http://web.gps.caltech.edu/~mbrown/papers/ps/gab.pdf| access-date = 19 October 2011| ref = {{sfnRef|Brown Van Dam et al.|2006}} |
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}}</ref> Strong absorption features observed at 1.5, 1.65 and 2 [[micrometre|μm]] in its [[infrared]] spectrum are consistent with nearly pure crystalline water ice covering much of its surface. The unusual spectrum, and its similarity to absorption lines in the spectrum of Haumea, led Brown and colleagues to conclude that it was unlikely that the system of moons was formed by the gravitational capture of passing Kuiper belt objects into orbit around the dwarf planet: instead, the Haumean moons must be fragments of Haumea itself.<ref name="largest">{{cite web |
}}</ref> Strong absorption features observed at 1.5, 1.65 and 2 [[micrometre|μm]] in its [[infrared]] spectrum are consistent with nearly pure crystalline water ice covering much of its surface. The unusual spectrum, and its similarity to absorption lines in the spectrum of Haumea, led Brown and colleagues to conclude that it was unlikely that the system of moons was formed by the gravitational capture of passing Kuiper belt objects into orbit around the dwarf planet: instead, the Haumean moons must be fragments of Haumea itself.<ref name="largest">{{cite web |
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