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**17 Thetis**
Orbital characteristics ¹
Orbit type	Main belt
Semimajor axis	2.470 AU
Perihelion distance	2.139 AU
Aphelion distance	2.801 AU
Orbital period	3.88 years
Inclination	5.59°
Eccentricity	0.134
Physical characteristics ¹
Diameter	90 km
Rotation period	12.27 hours
Spectral class	SApproximately 17% of all known asteroids are of an S-type (for stony composition. S-types are moderately bright (with an albedo of 0. 22) and consist of metallic nickel- iron mixed with iron- and magnesium- silicates. They dominate the inner to central ma
Abs. magnitudeIn astronomy, absolute magnitude is the apparent magnitude, m an object would have if it were at a standardized distance away. It allows the overall brightnesses of objects to be compared without regards to distance. Absolute Magnitude for stars M In stel	7.76
AlbedoNote: This article discusses the physical or planetological property of albedo. For other usage, see Albedo (disambiguation). The albedo is a measure of reflectivity of a surface or body. It is the ratio of electromagnetic radiation reflected to the amoun ⁴	0.172
History ²
Discoverer	R. LutherKarl Theodor Robert Luther ( April 16 1822 February 15 1900) was a German astronomer who searched for asteroids while working in Dusseldorf. Two of his discoveries are now known to have unusual properties: the binary asteroid with equal components 90 Anti, 1852Events January 14 President Louis-Napoleon Bonaparte proclaims a new constitution for the French Second Republic. January 17 United Kingdom recognizes independence of the Transvaal Devil's Island penal colony opens February 11 First British public toilet

17 Thetis ("THEE tuss") is a large Main belt asteroid. It is a S-type asteroid, so it has a relatively bright surface and stony silicate and metallic iron- nickel composition.

It was discovered by R. Luther on April 17, 1852. It was his first asteroid discovery. Its name comes from Thetis, the mother of Achilles in Greek mythology.

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

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Thetis

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Topics: 17 Thetis Asteroid Silicate Luther Event Stony Belt Surface...

17th century16th century 17th century 18th century more centuries) As a means of recording the passage of time, the 17th century was that century which lasted from 1601- 1700. During this period, the power of England and the United Provinces increased; while that of	1756Events March 17 St. Patrick's Day is celebrated in New York City for the first time (at the Crown and Thistle Tavern). May 15 Seven Years' War: The war begins when England declares war on France. August 29 Frederick the Great attacks Saxony October 1 Seve	1791Events January 25 The British Parliament passes the Constitutional Act of 1791, splitting the old province of Quebec into Upper and Lower Canada March 3 The United States Congress passes a resolution calling for the establishment of the United States Mint
1743Events February 14 Henry Pelham becomes British Prime Minister February 21 - The premiere in London of George Frideric Handel's oratorio, Samson''. September 13 Treaty of Worms (1743) a treaty between Great Britain, Austria and Sardinia Battle of Dettinge	1788Events January 1 First edition of The Times previously The Daily Universal Register was published. January 2 Georgia ratifies the United States Constitution and becomes the 4th U. January 9 Connecticut ratifies the United States Constitution and becomes t	1787Events In Britain, Thomas Clarkson and Granville Sharp formed the Society for the Abolition of the Slave Trade with support from John Wesley, Josiah Wedgwood and others. January 11 William Herschel discovers Titania and Oberon, two moons of Uranus. Februa
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