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17 Thetis

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Discovered by  R. Luther
Pronunciation  /ˈθiːtᵻs/ THEE-tis
Adjectives  Thetidian
Discovered  17 April 1852
Spectral type  S-type asteroid
Named after  Thetis
Discovery date  April 17, 1852
Minor planet category  Main belt
Orbital period  1,418 days
Orbits  Sun
Discoverer  Robert Luther
17 Thetis httpsuploadwikimediaorgwikipediacommonsthu
Alternative names  A913 CA; A916 YF; 1954 SO1
Similar  Robert Luther discoveries, Other celestial objects

Asteroid 17 thetis

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.


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.


The mass of Thetis has been calculated from perturbations by 4 Vesta and 11 Parthenope. In 2007, Baer and Chesley calculated Thetis to have a mass of 1.2×1018 kg with a density of 3.21 g/cm³.


17 Thetis Wikipedia

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