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{{Short description|Main-belt asteroid}}
{{Use mdy dates|date=October 2012}}
{{Use dmy dates|date=June 2017}}
<!-- Additional parameters for this template are available at [[Template:Infobox Planet]]. -->{{Infobox planet
{{Infobox planet
| discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
| minorplanet = yes
| name=17 Thetis
| symbol= [[File:17 Thetis symbol.svg|x25px]]
| name = 17 Thetis
| background = #D6D6D6
| image=[[File:17Thetis-LB1.jpg|240px]]
| symbol = [[File:Thetis symbol (bold).svg|24px]] (historical)
| caption=Star field showing asteroid Thetis in the center
| image = 17Thetis-LB1.jpg
| discoverer=[[Karl Theodor Robert Luther|R. Luther]]
| image_scale =
| discovered=April 17, 1852
| caption = Star field showing asteroid Thetis in the center
| pronounced ={{IPAc-en|ˈ|θ|iː|t|ɨ|s}} {{respell|THEE|tis}}
| discovery_ref = <ref name="jpldata" />
| alt_names=A913 CA; A916 YF;<br/>{{mp|1954 SO|1}}
| discovered = 17 April 1852
| named_after = [[Thetis]]
| discoverer = [[Robert Luther|R. Luther]]
| adjectives = Thetidian
| discovery_site = [[Düsseldorf-Bilk Observatory|Düsseldorf-Bilk Obs.]]
| mp_category=[[Asteroid belt|Main belt]]
| mpc_name = (17) Thetis
| orbit_ref=<ref name=jpldata>{{cite web
| alt_names = {{mp|1954 SO|1}}{{·}}{{mp|A913 CA}}<br />{{mp|A916 YF}}
|type=2008-08-04 last obs
| pronounced = {{IPAc-en|ˈ|θ|iː|t|ᵻ|s}}<ref>Noah Webster (1884) ''A Practical Dictionary of the English Language''</ref>
|title=JPL Small-Body Database Browser: 17 Thetis
| adjectives = Thetidian {{IPAc-en|θ|ɛ|ˈ|t|ɪ|d|i|ə|n}}<ref>Herbert (1828) ''Nimrod: a discourse on certain passages of history and fable'', vol. 2</ref>
|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=17
| named_after = {{nowrap|[[Thetis]] {{small|(Greek mythology)}}<ref name="springer" />}}
|accessdate=2008-11-12}}</ref>
| mp_category = [[main-belt]]<ref name="MPC-Thetis" />{{·}}{{small|([[Kirkwood gap|inner]])}}
| epoch=October 22, 2004 ([[Julian day|JD]] 2453300.5)
| orbit_ref = <ref name="jpldata" />
| semimajor=369.530 Gm (2.470 [[Astronomical unit|AU]])
| epoch = 16 February 2017 ([[Julian day|JD]] 2457800.5)
| perihelion=319.991 Gm (2.139 AU)
| uncertainty = 0
| aphelion=419.069 Gm (2.801 AU)
| observation_arc = 164.55 yr (60,102 days)
| eccentricity=0.134
| aphelion = 2.7987 [[Astronomical unit|AU]]
| period=1418.027 d (3.88 [[Julian year (astronomy)|a]])
| perihelion = 2.1436 AU
| inclination=5.587°
| semimajor = 2.4712 AU
| asc_node=125.622°
| eccentricity = 0.1325
| arg_peri=135.906°
| period = 3.88 [[Julian year (astronomy)|yr]] (1,419 days)
| mean_anomaly=38.435°
| mean_anomaly = 100.44[[Degree (angle)|°]]
| avg_speed=18.87&nbsp;km/s
| mean_motion = {{Deg2DMS|0.2537|sup=ms}} / day
| dimensions=90 ± 3.7&nbsp;km ([[IRAS]])<ref name=jpldata/>
| inclination = 5.5902°
| mass=1.2{{e|18}} kg<ref name="Baer2007"/><ref name=Thetismass2007/>
| asc_node = 125.56°
| density=3.21 ± 0.92 g/cm³<ref name="Baer2007"/>
| arg_peri = 136.10°
| surface_grav=0.0252 m/s²
| escape_velocity=0.0476 km/s
| avg_speed = 18.87 km/s
| dimensions = {{val|84.899|2.027}}<ref name="Masiero-2014" /><br />{{val|90|3.7}}km {{small|([[IRAS]])}}<ref name="SIMPS" /><br />{{val|93.335|2.627}}<ref name="WISE" />
| rotation=0.5113 d (12.27 h)<ref name=jpldata/><ref>{{cite web |url=http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm |title=LIGHTCURVES AND MAP DATA ON NUMBERED ASTEROIDS N° 1 TO 52225 |accessdate= 2008-11-03 |publisher=AstroSurf |archiveurl=http://web.archive.org/web/20051127063200/http://www.astrosurf.com/aude-old/map_files/AstVarMAP01-2003.htm |archivedate=2005-11-27 }}</ref>
| mass = 1.23{{e|18}} kg<ref name="Baer-2008" />{{efn|name=Thetismass2007}}
| spectral_type=[[S-type asteroid|S]]<ref name=jpldata/>
| density = {{val|3.21|0.92}} g/cm<sup>3</sup><ref name="Baer-2008" />
| magnitude = 9.89 to 13.51<ref>[[apparent magnitude|apmag]] 9.89 (1977-Jul-25) to 13.51 (1963-Aug-02) [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=17 JPL Horizons] daily output for 1950 to 2099</ref>
| rotation = {{val|12.27048|0.00001}}<ref name="lcdb" /><ref name="Michalowski-1995" />
| abs_magnitude=7.76<ref name=jpldata/>
| albedo = {{val|0.193|0.028}}<ref name="Masiero-2014" />
| albedo=0.1715<ref name=jpldata/><ref>{{cite web |url=http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab |title=Asteroid Data Archive |accessdate= 2008-11-03 |publisher=Planetary Science Institute |archiveurl=http://web.archive.org/web/20060623213811/http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab|archivedate=2006-06-23 }}</ref>
| spectral_type = [[Asteroid color indices|B–V]] = 0.829<ref name="jpldata" /><br />[[Asteroid color indices|U–B]] = 0.438<ref name="jpldata" /><br />[[S-type asteroid|S]] {{small|([[Tholen classification|Tholen]])}}<ref name="jpldata" /><br />Sl {{small|([[SMASS classification|SMASS]])}}<ref name="jpldata" />{{·}}[[S-type asteroid|S]]<ref name="lcdb" />
| single_temperature=~173 [[kelvin|K]]
| abs_magnitude = 7.76<ref name=jpldata/><ref name="SIMPS" /><ref name="WISE" />{{·}}7.85<ref name="Michalowski-1995" />
}}
}}

'''17 Thetis''' is a large [[asteroid belt|main-belt]] [[asteroid]] that was discovered by [[Karl Theodor Robert Luther|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>{{cite book|last=Schmadel|first=Lutz D.|title=Dictionary of minor planet names|volume=1|edition=5th |date=2003|publisher=Springer-Verlag|location=Berlin Heidelberg New York|isbn=3-540-00238-3|pages=17}}</ref>
'''Thetis''', [[minor planet designation]] '''17 Thetis''', is a stony [[asteroid]] from the inner regions of the [[asteroid belt]], approximately 90 kilometers in diameter. It was discovered on 17 April 1852, by German astronomer [[Robert Luther]] at [[Bilk Observatory]] in Düsseldorf, Germany who deferred to [[Friedrich Wilhelm August Argelander]] the naming his first asteroid discovery after [[Thetis]] from Greek mythology.<ref name="springer" /><ref name="MPC-Thetis" /> Its historical symbol was a dolphin and a star; it is in the pipeline for [[Unicode]] 17.0 as U+1CECA 𜻊 ([[File:Thetis symbol (fixed width).svg|12px]]).<ref name=astunicode>{{cite web |url=https://www.unicode.org/L2/L2023/23207-historical-asteroids.pdf |title=Unicode request for historical asteroid symbols |last1=Bala |first1=Gavin Jared |last2=Miller |first2=Kirk |date=18 September 2023 |website=unicode.org |publisher=Unicode |access-date=26 September 2023 |quote=}}</ref><ref name=pipeline>{{cite web |url=https://unicode.org/alloc/Pipeline.html |title=Proposed New Characters: The Pipeline |author=Unicode |date= |website=unicode.org |publisher=The Unicode Consortium |access-date=6 November 2023 |quote=}}</ref>

== Description ==
The asteroid orbits the Sun at a distance of 2.1–2.8&nbsp;[[Astronomical unit|AU]] once every 3 years and 11 months (1,419 days). Its orbit has an [[orbital eccentricity|eccentricity]] of 0.13 and an [[orbital inclination|inclination]] of 6[[Degree (angle)|°]] with respect to the [[ecliptic]].<ref name="jpldata" />

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="Sunshine-2004" />

The mass of Thetis has been calculated from [[Perturbation (astronomy)|perturbations]] by [[4 Vesta]] and [[11 Parthenope]]. In 2007, Baer and Chesley calculated Thetis to have a mass of 1.23{{e|18}} kg{{efn|name=Thetismass2007}} with a density of 3.21 g/cm<sup>3</sup>.<ref name="Baer-2008" />


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.


This [[minor planet]] was named after [[Thetis]], the mother of [[Achilles]] in [[Greek mythology]].<ref name="springer" />
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"/>


==Mass==
== Notes ==
{{notelist|refs=
The mass of Thetis has been calculated from [[Perturbation (astronomy)|perturbations]] by [[4 Vesta]] and [[11 Parthenope]]. In 2007, Baer and Chesley calculated Thetis to have a mass of 1.2{{e|18}} kg<ref name="Baer2007">{{cite journal
|last=Baer |first=James
|author2=Steven R. Chesley
|title=Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris
|journal=Celestial Mechanics and Dynamical Astronomy
|volume=100 |issue=2008 |pages=27–42
|publisher=Springer Science+Business Media B.V. 2007
|url=http://www.springerlink.com/content/h747307j43863228/fulltext.pdf
|format=[[PDF]]
|doi=10.1007/s10569-007-9103-8
|accessdate=2008-11-12
|date=2007 |bibcode = 2008CeMDA.100...27B }}</ref><ref name=Thetismass2007>(Mass of Thetis 0.00617 / Mass of Ceres 4.75) * [[Ceres (dwarf planet)|Mass of Ceres]] 9.43E+20 = 1.224E+18</ref> with a density of 3.21 g/cm³.<ref name="Baer2007"/>


{{efn|name=Thetismass2007|1=Mass of Thetis = {{val|6.17|0.64|e=-13|u={{Solar mass}}}}}}
==References==

{{Reflist|refs=
}} <!-- end of notelist -->
<ref name="Sunshine2004">{{Citation

| last1 = Sunshine
== References ==
| first1 = Jessica M.
{{reflist|refs=
| last2 = Bus

| first2 = Schelte J.
<ref name="jpldata">{{cite web
| last3 = McCoy
| first3 = Timothy J.
|type = 2016-11-11 last obs.
|title = JPL Small-Body Database Browser: 17 Thetis
| last4 = Burbine
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000017
| first4 = Thomas H.
|publisher = [[Jet Propulsion Laboratory]]
| last5 = Corrigan
|accessdate = 24 March 2017}}</ref>
| first5 = Catherine M.

| last6 = Binzel
<ref name="springer">{{cite book
| first6 = Richard P.
|title = Dictionary of Minor Planet Names – (17) Thetis
| display-authors = 1
|last = Schmadel | first = Lutz D.
| title = High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites
|publisher = [[Springer Berlin Heidelberg]]
| work = Meteoritics & Planetary Science
| volume = 39
|page = 17
| issue = 8
|date = 2007
| pages = 1343–1357
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_18 }}</ref>
| date = August 2004

| doi = 10.1111/j.1945-5100.2004.tb00950.x
<ref name="MPC-Thetis">{{cite web
| bibcode = 2004M&PS...39.1343S
|title = 17 Thetis
| postscript= .
|work = Minor Planet Center
}}</ref>
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=17
}}
|accessdate = 24 March 2017}}</ref>

<ref name="Sunshine-2004">{{Cite journal
|first1 = Jessica M. |last1 = Sunshine
|first2 = Schelte J. |last2 = Bus
|first3 = Timothy J. |last3 = McCoy
|first4 = Thomas H. |last4 = Burbine
|first5 = Catherine M. |last5 = Corrigan
|first6 = Richard P. |last6 = Binzel
|date = August 2004
|title = High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites
|journal = Meteoritics and Planetary Science
|volume = 39
|issue = 8
|pages = 1343–1357
|bibcode = 2004M&PS...39.1343S
|doi = 10.1111/j.1945-5100.2004.tb00950.x|doi-access=
}}</ref>

<ref name="Baer-2008">{{Cite journal
|first1 = James |last1 = Baer
|first2 = Steven R. |last2 = Chesley
|date = January 2008
|title = Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris
|journal = Celestial Mechanics and Dynamical Astronomy
|volume = 100
|issue = 1
|pages = 27–42
|bibcode = 2008CeMDA.100...27B
|doi = 10.1007/s10569-007-9103-8|doi-access= free
}}</ref>

<ref name="Masiero-2014">{{cite journal
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = T. |last2 = Grav
|first3 = A. K. |last3 = Mainzer
|first4 = C. R. |last4 = Nugent
|first5 = J. M. |last5 = Bauer
|first6 = R. |last6 = Stevenson
|first7 = S. |last7 = Sonnett
|date = August 2014
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|journal = The Astrophysical Journal
|volume = 791
|issue = 2
|page = 11
|bibcode = 2014ApJ...791..121M
|doi = 10.1088/0004-637X/791/2/121
|arxiv = 1406.6645}}</ref>

<ref name="lcdb">{{cite web
|title = LCDB Data for (17) Thetis
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=17%7CThetis
|accessdate = 24 March 2017}}</ref>

<ref name="WISE">{{cite journal
|display-authors = 6
|first1 = A. |last1 = Mainzer
|first2 = T. |last2 = Grav
|first3 = J. |last3 = Masiero
|first4 = E. |last4 = Hand
|first5 = J. |last5 = Bauer
|first6 = D. |last6 = Tholen
|first7 = R. S. |last7 = McMillan
|first8 = T. |last8 = Spahr
|first9 = R. M. |last9 = Cutri
|first10 = E. |last10 = Wright
|first11 = J. |last11 = Watkins
|first12 = W. |last12 = Mo
|first13 = C. |last13 = Maleszewski
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|arxiv = 1109.6407}}</ref>

<ref name="SIMPS">{{cite journal
|first1 = E. F. |last1 = Tedesco
|first2 = P. V. |last2 = Noah
|first3 = M. |last3 = Noah
|first4 = S. D. |last4 = Price
|date = October 2004
|title = IRAS Minor Planet Survey V6.0
|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab
|journal = NASA Planetary Data System
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|accessdate = 30 October 2019}}</ref>

<ref name="Michalowski-1995">{{Cite journal
|display-authors = 6
|first1 = T. |last1 = Michalowski
|first2 = F. P. |last2 = Velichko
|first3 = M. |last3 = Di Martino
|first4 = Yu. N. |last4 = Krugly
|first5 = V. G. |last5 = Kalashnikov
|first6 = V. G. |last6 = Shevchenko
|first7 = P. V. |last7 = Birch
|first8 = W. D. |last8 = Sears
|first9 = P. |last9 = Denchev
|first10 = T. |last10 = Kwiatkowski
|date = December 1995
|title = Models of four asteroids: 17 Thetis, 52 Europa, 532 Herculina, and 704 Interamnia.
|journal = Icarus
|volume = 118
|issue = 2
|pages = 292–301
|bibcode = 1995Icar..118..292M
|doi = 10.1006/icar.1995.1192}}</ref>

}} <!-- end of reflist -->


== External links ==
== External links ==
{{commons category|17 Thetis}}
{{commons category}}
* [https://web.archive.org/web/20140108195730/http://www.asteroidoccultation.com/observations/Results/Data2011/Thetis_withModel2Rotated2.jpg 2011-Apr-22 Occultation] (Durech Model) / [https://web.archive.org/web/20140108170501/http://www.asteroidoccultation.com/observations/Results/index2011.html (2011 Asteroidal Occultation Results for North America)]
* [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=17 JPL Ephemeris]
* [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
* {{cite web |title=Elements and Ephemeris for (17) Thetis |publisher=Minor Planet Center |url=http://scully.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=b2011&o=00017 }} (displays [[Elongation (astronomy)|Elong]] from Sun and [[apparent magnitude|V mag]] for 2011)
* [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
* [http://www.asteroidoccultation.com/observations/Results/Data2011/Thetis_withModel2Rotated2.jpg 2011-Apr-22 Occultation] (Durech Model) / [http://www.asteroidoccultation.com/observations/Results/index2011.html (2011 Asteroidal Occultation Results for North America)]
* [http://obswww.unige.ch/~behrend/page1cou.html#000017 Asteroids and comets rotation curves – (17) Thetis] at Observatoire de Genève, Raoul Behrend
* [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
* {{AstDys|17}}
* {{JPL small body}}
* {{JPL small body}}


{{Minor planets navigator|16 Psyche|18 Melpomene}}
{{Minor planets navigator |16 Psyche |number=17 |18 Melpomene}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}
{{Authority control}}


{{DEFAULTSORT:000017}}
{{DEFAULTSORT:000017}}
[[Category:Main-belt asteroids]]
[[Category:Background asteroids]]
[[Category:Minor planets named from Greek mythology|Thetis]]
[[Category:S-type asteroids]]
[[Category:Astronomical objects discovered in 1852|18520417]]
[[Category:Discoveries by Robert Luther|Thetis]]
[[Category:Discoveries by Robert Luther|Thetis]]
[[Category:Numbered minor planets]]
[[Category:Named minor planets|Thetis]]
[[Category:S-type asteroids (Tholen)]]
[[Category:Sl-type asteroids (SMASS)]]
[[Category:Astronomical objects discovered in 1852|18520417]]

Revision as of 23:34, 25 April 2024

17 Thetis
Star field showing asteroid Thetis in the center
Discovery[1]
Discovered byR. Luther
Discovery siteDüsseldorf-Bilk Obs.
Discovery date17 April 1852
Designations
(17) Thetis
Pronunciation/ˈθiːtɪs/[2]
Named after
Thetis (Greek mythology)[3]
1954 SO1 · A913 CA
A916 YF
main-belt[4] · (inner)
AdjectivesThetidian /θɛˈtɪdiən/[5]
Symbol (historical)
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc164.55 yr (60,102 days)
Aphelion2.7987 AU
Perihelion2.1436 AU
2.4712 AU
Eccentricity0.1325
3.88 yr (1,419 days)
18.87 km/s
100.44°
0° 15m 13.32s / day
Inclination5.5902°
125.56°
136.10°
Physical characteristics
Dimensions84.899±2.027[6]
90±3.7km (IRAS)[7]
93.335±2.627[8]
Mass1.23×1018 kg[9][a]
Mean density
3.21±0.92 g/cm3[9]
12.27048±0.00001[10][11]
0.193±0.028[6]
B–V = 0.829[1]
U–B = 0.438[1]
S (Tholen)[1]
Sl (SMASS)[1] · S[10]
7.76[1][7][8] · 7.85[11]

Thetis, minor planet designation 17 Thetis, is a stony asteroid from the inner regions of the asteroid belt, approximately 90 kilometers in diameter. It was discovered on 17 April 1852, by German astronomer Robert Luther at Bilk Observatory in Düsseldorf, Germany who deferred to Friedrich Wilhelm August Argelander the naming his first asteroid discovery after Thetis from Greek mythology.[3][4] Its historical symbol was a dolphin and a star; it is in the pipeline for Unicode 17.0 as U+1CECA 𜻊 ().[12][13]

Description

The asteroid orbits the Sun at a distance of 2.1–2.8 AU once every 3 years and 11 months (1,419 days). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic.[1]

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.[14]

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 1.23×1018 kg[a] with a density of 3.21 g/cm3.[9]

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

This minor planet was named after Thetis, the mother of Achilles in Greek mythology.[3]

Notes

  1. ^ a b Mass of Thetis = (6.17±0.64)×10−13 M☉

References

  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 17 Thetis" (2016-11-11 last obs.). Jet Propulsion Laboratory. Retrieved 24 March 2017.
  2. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  3. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (17) Thetis. Springer Berlin Heidelberg. p. 17. doi:10.1007/978-3-540-29925-7_18. ISBN 978-3-540-00238-3.
  4. ^ a b "17 Thetis". Minor Planet Center. Retrieved 24 March 2017.
  5. ^ Herbert (1828) Nimrod: a discourse on certain passages of history and fable, vol. 2
  6. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
  7. ^ a b Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 30 October 2019.
  8. ^ a b Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
  9. ^ a b c Baer, James; Chesley, Steven R. (January 2008). "Astrometric masses of 21 asteroids, and an integrated asteroid ephemeris". Celestial Mechanics and Dynamical Astronomy. 100 (1): 27–42. Bibcode:2008CeMDA.100...27B. doi:10.1007/s10569-007-9103-8.
  10. ^ a b "LCDB Data for (17) Thetis". Asteroid Lightcurve Database (LCDB). Retrieved 24 March 2017.
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