17 Thetis: Difference between revisions
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{{Minor Planet | |
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{| table border="1" cellspacing="0" cellpadding="2" align="right" style="margin-left: 1em" |
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name=17 Thetis |
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| discovery_date=[[April 17]], [[1852]] |
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! bgcolor="#ffc0c0" colspan="2" | Orbital characteristics <sup>[ftp://ftp.lowell.edu/pub/elgb/astorb.html 1]</sup> |
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| designations=A913 CA; A916 YF; 1954 SO<sub>1</sub> |
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| category=[[Main belt]] |
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| epoch=[[October 22]], [[2004]] ([[Julian day|JD]] 2453300.5) |
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|[[ |
| semimajor=369.530 [[Giga|G]][[metre|m]] (2.470 [[Astronomical unit|AU]]) |
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| perihelion=319.991 Gm (2.139 AU) |
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| aphelion=419.069 Gm (2.801 AU) |
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|[[Perihelion]] distance || 2.139 [[Astronomical Unit|AU]] |
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| eccentricity=0.134 |
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| period=1418.027 [[day|d]] (3.88 [[Julian year|a]]) |
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|[[Aphelion]] distance || 2.801 [[Astronomical Unit|AU]] |
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| inclination=5.587[[degree|°]] |
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| asc_node=125.622° |
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|[[Orbital period]] || 3.88 [[Year|years]] |
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| arg_peri=135.906° |
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| mean_anomaly=38.435° |
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|[[Inclination]] || 5.59° |
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| speed=18.87 km/[[second|s]] |
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| dimensions=90.0 km |
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|[[Eccentricity]] || 0.134 |
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| mass=7.6×10<sup>17</sup> [[kilogram|kg]] |
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| density=2.0? g/[[cubic centimetre|cm³]] |
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| gravity=0.0252 m/s² |
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! bgcolor="#ffc0c0" colspan="2" | Physical characteristics <sup>[ftp://ftp.lowell.edu/pub/elgb/astorb.html 1]</sup> |
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| escape_velocity=0.0476 km/s |
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| rotation=0.5113 d (12.27 h) [http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm <sup>1</sup>] |
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|[[Diameter]] || 90 [[Kilometre|km]] |
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| spectral_class=[[S-type asteroid|S]] |
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| abs_mag=7.76 |
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|[[Rotation period]] || 12.27 [[Hour|hours]] |
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| temperature=~239 [[kelvin|K]]}} |
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|[[Asteroid#Spectral_classification|Spectral class]] || [[S-type asteroid|S]] |
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|[[Absolute magnitude|Abs. magnitude]] || 7.76 |
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! bgcolor="#ffc0c0" colspan="2" | History <sup>[http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html 2]</sup> |
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'''17 Thetis''' ("THEE tuss") is a large [[Main belt]] [[asteroid]]. It is a [[S-type asteroid|S-type]] asteroid, so it has a relatively bright surface and stony [[silicate]] and [[metal|metallic]] [[iron]]-[[nickel]] composition. |
'''17 Thetis''' ("THEE tuss") is a large [[Main belt]] [[asteroid]]. It is a [[S-type asteroid|S-type]] asteroid, so it has a relatively bright surface and stony [[silicate]] and [[metal|metallic]] [[iron]]-[[nickel]] composition. |
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One [[star|stellar]] [[occultation]] by Thetis is observed from [[Oregon]] in [[1999]]. However, the event was not timed. |
One [[star|stellar]] [[occultation]] by Thetis is observed from [[Oregon]] in [[1999]]. However, the event was not timed. |
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Revision as of 13:05, 7 December 2004
Template:Minor Planet 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.