Ymir (moon)

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Ymir Template:IPAc-en, or Saturn XIX, is the second-largest retrograde irregular moon of Saturn. It was discovered by Brett J. Gladman, et al. in 2000, and given the temporary designation S/2000 S 1. It was named in August 2003 after Ymir, who in Norse mythology is the ancestor of all the Jotuns or frost giants.<ref name=naming>Template:Cite web</ref>

It takes 3.6 Earth years to complete an orbit around Saturn. Of the moons that take more than 3 Earth years to orbit Saturn, Ymir is the largest, at about Template:Convert in diameter;<ref name=sheppard>Template:Cite web</ref> Ymir is also the second largest member of the Norse group, after Phoebe.<ref name="DenkEtAl2018">Template:Cite book</ref>

Spectral measurements from Cassini–Huygens show that Ymir is reddish in color, unlike Phoebe's gray color, suggesting a separate origin for this moon. It shows a similar light curve as Siarnaq and has a triangular shape, rotating in a retrograde direction about once every 11.9 hours.<ref name="DenkEtAl2018"/>

File:Ymir-CFHT.gif

Ymir imaged by the CFHT on 23 September 2000

File:Ymir lightcurve shape model.png

3D model created based on lightcurve data

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