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Skoll (satelit)

Skoll
Descoperire[1]
Descoperit deS. S. Sheppard⁠(d)
D. C. Jewitt⁠(d)
J. Kleyna⁠(d)
Dată descoperire2006
Denumiri
Denumire MPCSaturn XLVII
PronunțieRomână: /'skol/
Nordică veche: [skœlː]
Denumit după
Sköll
Nume alternative
S/2006 S 8
Caracteristicile orbitei[2]
17.56 Gm
Excentricitate0.418
Perioadă orbitală
869 zile
(2.38 ani)
Înclinație156°
SatelițiSaturn
Caracteristici fizice
Diametrul mediu
5+50%
−30% km[3]
7.26±0.09? ore[3]
Albedo0.04 (presupus)[4]

Skoll sau Saturn XLVII (denumirea provizorie S/2006 S 8 ) este un satelit retrograd neregulat al lui Saturn. Descoperirea sa a fost anunțată de Scott S. Sheppard⁠(d), David C. Jewitt⁠(d) și Jan Kleyna pe 26 iunie 2006, din observațiile efectuate între 5 ianuarie și 30 aprilie 2006. [5]

Skoll are un diametru de aproximativ 6 kilometri (presupunând un albedo de 0,04) și îl orbitează pe Saturn la o distanță medie de 17,6 Gm (milioane km) în 869 de zile, urmând o orbită foarte excentrică și moderat înclinată. O perioadă de rotație de 7.26±0.04 ore a fost obținută de Cassini–Huygens în 2016, dar acest lucru este în dezacord puternic cu datele din 2013 din motive necunoscute; o posibilă explicație este variația vitezei de rotație și a axei din cauza oscilației Milankovitch.[6]

A fost numit în aprilie 2007 [7] după Sköll, un lup uriaș din mitologia nordică, fiul lui Fenrir și fratele geamăn al lui Hati.

Referințe

  1. ^ Discovery Circumstances from JPL
  2. ^ MPEC 2006-M45: Eight New Satellites of Saturn 26 June 2006 (discovery and ephemeris)
  3. ^ a b Denk, T.; Mottola, S. (). Cassini Observations of Saturn's Irregular Moons (PDF). 50th Lunar and Planetary Science Conference. Lunar and Planetary Institute. 
  4. ^ Scott Sheppard's pages
  5. ^ IAUC 8727: Satellites of Saturn 30 June 2006 (discovery)
  6. ^ Denk, T.; Mottola, S.; Bottke, W. F.; Hamilton, D. P. (). „The Irregular Satellites of Saturn”. Enceladus and the Icy Moons of Saturn (PDF). 322. University of Arizona Press. pp. 409–434. Bibcode:2018eims.book..409D. doi:10.2458/azu_uapress_9780816537075-ch020. ISBN 9780816537488. 
  7. ^ IAUC 8826: Satellites of Jupiter and Saturn 5 April 2007 (naming the moon)

Legături externe

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WikiProjectProiect · PortalPortal Saturn · PortalPortal Astronomie · PortalPortal Sistemul Solar
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