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{{ safesubst:#invoke:Unsubst||$N=Use mdy dates |date=__DATE__ |$B= }} {{#invoke:Infobox|infobox}} 17 Thetis is a large main-belt asteroid that was discovered by R. Luther on April 17, 1852. It was his first asteroid discovery. The name comes from Thetis, the mother of Achilles in Greek mythology.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

One Thetidian stellar occultation was observed from Oregon in 1999. However, the event was not timed.

The spectrum of this object indicates that it is an S-type asteroid with both low and high calcium forms of pyroxene on the surface, along with less than 20% olivine. The high-calcium form of pyroxene forms 40% or more of the total pyroxene present, indicating a history of igneous rock deposits. This suggests that the asteroid underwent differentiation by melting, creating a surface of basalt rock.<ref name="Sunshine2004"/>


17 Thetis sections
Intro  Mass  References   External links   

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Thetis::first    Asteroid::title    Jpldata::category    Luther::archive    Pyroxene::pages    Sunshine::surface

{{ safesubst:#invoke:Unsubst||$N=Use mdy dates |date=__DATE__ |$B= }} {{#invoke:Infobox|infobox}} 17 Thetis is a large main-belt asteroid that was discovered by R. Luther on April 17, 1852. It was his first asteroid discovery. The name comes from Thetis, the mother of Achilles in Greek mythology.<ref>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

One Thetidian stellar occultation was observed from Oregon in 1999. However, the event was not timed.

The spectrum of this object indicates that it is an S-type asteroid with both low and high calcium forms of pyroxene on the surface, along with less than 20% olivine. The high-calcium form of pyroxene forms 40% or more of the total pyroxene present, indicating a history of igneous rock deposits. This suggests that the asteroid underwent differentiation by melting, creating a surface of basalt rock.<ref name="Sunshine2004"/>


17 Thetis sections
Intro  Mass  References   External links   

PREVIOUS: IntroNEXT: Mass
<<>>