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<!-- Additional parameters for this template are available at [[Template:Infobox Planet]]. -->{{Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 |
<!-- Additional parameters for this template are available at [[Template:Infobox Planet]]. -->{{Infobox planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 |
name=17 Thetis
name=17 Thetis
| image=[[File:17Thetis-LB1.jpg|240px]]
| image=[[File:17Thetis-LB1.jpg|240px]]
| caption=Star field showing asteroid Thetis in the center
| caption=Star field showing asteroid Thetis in the center
| discoverer=[[Karl Theodor Robert Luther|R. Luther]]
| discoverer=[[Karl Theodor Robert Luther|R. Luther]]
| discovered=[[April 17]], [[1852]]
| discovered=April 17, 1852
| alt_names=A913 CA; A916 YF;<br/>{{mp|1954 SO|1}}
| alt_names=A913 CA; A916 YF;<br/>{{mp|1954 SO|1}}
| mp_category=[[Main belt]]
| mp_category=[[Main belt]]
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|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=17
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=17
|accessdate=2008-11-12}}</ref>
|accessdate=2008-11-12}}</ref>
| epoch=[[October 22]], [[2004]] ([[Julian day|JD]] 2453300.5)
| epoch=October 22, 2004 ([[Julian day|JD]] 2453300.5)
| semimajor=369.530 [[Giga|G]]m (2.470 [[Astronomical unit|AU]])
| semimajor=369.530 [[Giga|G]]m (2.470 [[Astronomical unit|AU]])
| perihelion=319.991 Gm (2.139 AU)
| perihelion=319.991 Gm (2.139 AU)
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'''17 Thetis''' ({{pronEng|ˈθiːt<s>ɪ</s>s}}, {{Lang-el|''Θέτις}})'' is a large [[Main belt]] [[asteroid]]. It is an [[S-type asteroid]], therefore giving it a relatively bright [[silicate]] surface.
'''17 Thetis''' ({{pronEng|ˈθiːt<s>ɪ</s>s}}, {{Lang-el|''Θέτις}})'' is a large [[Main belt]] [[asteroid]]. It is an [[S-type asteroid]], therefore giving it a relatively bright [[silicate]] surface.


It was discovered by [[Karl Theodor Robert Luther|R. Luther]] on [[April 17]], [[1852]]. It was his first asteroid discovery. Its name comes from [[Thetis]], the mother of [[Achilles]] in [[Greek mythology]].
It was discovered by [[Karl Theodor Robert Luther|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 Thetidian [[star|stellar]] [[occultation]] was observed from [[Oregon]] in [[1999]]. However, the event was not timed.
One Thetidian [[star|stellar]] [[occultation]] was observed from [[Oregon]] in [[1999]]. However, the event was not timed.
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|title=Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris
|title=Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris
|journal=Celestial Mechanics and Dynamical Astronomy
|journal=Celestial Mechanics and Dynamical Astronomy
|volume=100 |issue=2008 |pages=27-42
|volume=100 |issue=2008 |pages=27–42
|publisher=Springer Science+Business Media B.V. 2007
|publisher=Springer Science+Business Media B.V. 2007
|url=http://www.springerlink.com/content/h747307j43863228/fulltext.pdf
|url=http://www.springerlink.com/content/h747307j43863228/fulltext.pdf
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==Notes==
==Notes==
{{reflist|2}}
{{Reflist|2}}


==External links==
==External links==
*[http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=17;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=17 Ephemeris]
*[http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=17;orb=1 Orbital simulation] from JPL (Java) / [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=17 Ephemeris]


{{MinorPlanets Navigator|16 Psyche|18 Melpomene}}
{{Minor planets navigator|16 Psyche|18 Melpomene}}
{{Small Solar System bodies}}
{{MinorPlanets_Footer}}


{{DEFAULTSORT:Thetis}}
{{DEFAULTSORT:Thetis}}

Revision as of 00:45, 1 December 2009

17 Thetis
Star field showing asteroid Thetis in the center
Discovery
Discovered byR. Luther
Discovery dateApril 17, 1852
Designations
A913 CA; A916 YF;
1954 SO1
Main belt
Orbital characteristics[1]
Epoch October 22, 2004 (JD 2453300.5)
Aphelion419.069 Gm (2.801 AU)
Perihelion319.991 Gm (2.139 AU)
369.530 Gm (2.470 AU)
Eccentricity0.134
1418.027 d (3.88 a)
18.87 km/s
38.435°
Inclination5.587°
125.622°
135.906°
Physical characteristics
Dimensions90 km[1]
Mass1.2×1018 kg[2][3]
Mean density
3.21 ± 0.92 g/cm³[2]
0.0252 m/s²
0.0476 km/s
0.5113 d (12.27 h)[1][4]
Albedo0.1715 [1][5]
Temperature~173 K
Spectral type
S[1]
7.76[1]

17 Thetis (Template:PronEng, [Θέτις] Error: {{Lang-xx}}: text has italic markup (help)) is a large Main belt asteroid. It is an S-type asteroid, therefore giving it a relatively bright silicate surface.

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

Mass

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[2][3] with a density of 3.21 g/cm³.[2]

Notes

  1. ^ a b c d e f "JPL Small-Body Database Browser: 17 Thetis". 2008-08-04 last obs. Retrieved 2008-11-12. {{cite web}}: Check date values in: |date= (help)
  2. ^ a b c d Baer, James. "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris" (PDF). Celestial Mechanics and Dynamical Astronomy. 100 (2008). Springer Science+Business Media B.V. 2007: 27–42. doi:10.1007/s10569-007-9103-8. Retrieved 2008-11-12. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  3. ^ a b (Mass of Thetis 0.00617 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.224E+18
  4. ^ "LIGHTCURVES AND MAP DATA ON NUMBERED ASTEROIDS N° 1 TO 52225". AstroSurf. Archived from the original on 2005-11-27. Retrieved 2008-11-03.
  5. ^ "Asteroid Data Archive". Planetary Science Institute. Archived from the original on 2006-06-23. Retrieved 2008-11-03.
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