Ilmarë
Moon of 174567 Varda / From Wikipedia, the free encyclopedia
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Ilmarë,[lower-alpha 2] or Varda I, full designation 174567 Varda I Ilmarë, is the single known natural satellite of the Kuiper belt object 174567 Varda. It was discovered by Keith Noll et al. in 2009, at a separation of about 0.12 arcsec, using discovery images taken by the Hubble Space Telescope on 26 April 2009, and reported in 2011.[4] At approximately 326 km in diameter (about 45% that of its primary), it is the fourth or fifth-largest known moon of a trans-Neptunian object, after Pluto I Charon, Eris I Dysnomia, Orcus I Vanth and very possibly Haumea I Hiʻiaka. Assuming that Ilmarë has the same albedo and density as Varda, Ilmarë would constitute approximately 8.4% of the system's mass, approximately 2.2×1019 kg.
Discovery | |
---|---|
Discovered by | Keith S. Noll et al. |
Discovery date | 2009, based on images taken on 2009 April 26 |
Designations | |
Designation | Varda I |
Pronunciation | /ˈɪlməriː/ |
Named after | Ilmarë (figure by J. R. R. Tolkien)[1] |
174567 Varda I Ilmarë | |
Adjectives | Ilmarëan /ɪlməˈriːən/ |
Orbital characteristics[2] | |
4809±39 km | |
Eccentricity | 0.0181±0.0045 or 0.0247±0.0048 (0.0215±0.0080 adopted) |
5.75058±0.00015 d | |
Inclination | 101.0±1.9 or 85.1±1.8 |
Satellite of | Varda |
Physical characteristics | |
Mean diameter | ≈356[3] 326+38 −34 km[2][lower-alpha 1] |
Mass | ≈2.2×1019 kg[2] |
Mean density | 1.24+0.50 −0.35 g/cm3 (system)[2][lower-alpha 1] |
Albedo | ≈0.085[3] 0.166+0.043 −0.033 (assuming same as Varda) |
Spectral type | B−V = 0.857±0.061 V−I = 1.266±0.052[2] |
3.097±0.060 | |