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'''115 Thyra''' is a fairly large and bright inner [[main-belt]] [[asteroid]] that was discovered by Canadian-American astronomer [[James Craig Watson|J. C. Watson]] on August 6, 1871<ref name="IAU_MPC"/> and was named for [[Thyra]], the consort of King [[Gorm the Old]] of [[Denmark]]. Based upon its spectrum, it is categorized as a stony [[S-type asteroid]].<ref name="DeMeo2009"/>
'''115 Thyra''' is a fairly large and bright inner [[main-belt]] [[asteroid]] that was discovered by Canadian-American astronomer [[James Craig Watson|J. C. Watson]] on August 6, 1871<ref name="IAU_MPC"/> and was named for [[Thyra]], the consort of King [[Gorm the Old]] of [[Denmark]]. Based upon its spectrum, it is categorized as a stony [[S-type asteroid]].<ref name="DeMeo2009"/>


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==References==
==References==
{{Reflist|refs=
{{Reflist|refs=

<ref name="IAU_MPC">{{Citation
<ref name="IAU_MPC">{{Citation
| title = Numbered Minor Planets 1–5000
| title = Numbered Minor Planets 1–5000
| work = Discovery Circumstances
| work = Discovery Circumstances
| publisher = IAU Minor Planet center
| publisher = IAU Minor Planet center
| url = http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html
| url = https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html
| accessdate= 2013-04-07
| accessdate= 2013-04-07
| postscript= .
| postscript= .}}</ref>
}}</ref>


<ref name="JPL">{{Citation
<ref name="JPL">{{Citation
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| work = JPL Small-Body Database Browser
| work = JPL Small-Body Database Browser
| publisher = [[NASA Jet Propulsion Laboratory]]
| publisher = [[NASA Jet Propulsion Laboratory]]
| url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115
| url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115
| accessdate= 12 May 2016
| accessdate= 12 May 2016
| postscript= .
| postscript= .}}</ref>
}}</ref>


<ref name="Delbo2009">{{Citation
<ref name="Delbo2009">{{Citation
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| doi = 10.1051/0004-6361:20031706
| doi = 10.1051/0004-6361:20031706
| bibcode = 2004A&A...416..353M
| bibcode = 2004A&A...416..353M
| postscript= .
| postscript= .}}</ref>
}}</ref>


<ref name="Kryszczynska2007">{{Citation
<ref name="Kryszczynska2007">{{Citation
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| doi = 10.1016/j.icarus.2007.06.008
| doi = 10.1016/j.icarus.2007.06.008
| bibcode = 2007Icar..192..223K
| bibcode = 2007Icar..192..223K
| postscript= .
| postscript= .}}</ref>
}}</ref>


<ref name="DeMeo2009">{{Citation
<ref name="DeMeo2009">{{Citation
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|archiveurl = https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf
|archiveurl = https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf
|archivedate = 2014-03-17
|archivedate = 2014-03-17
|df =
|df = }} See appendix A.</ref>

}} See appendix A.</ref>
}} <!-- end of reflist -->
}}


==External links==
== External links ==
* {{AstDys|115}}
* {{JPL small body}}
* {{JPL small body}}


{{Minor planets navigator|114 Kassandra|number=115|116 Sirona}}
{{Minor planets navigator |114 Kassandra |number=115 |116 Sirona}}
{{Small Solar System bodies}}
{{Small Solar System bodies}}


{{DEFAULTSORT:000115}}
{{DEFAULTSORT:Thyra}}
[[Category:Background asteroids]]
[[Category:Background asteroids|000115]]
[[Category:Numbered minor planets]]
[[Category:Numbered minor planets|000115]]
[[Category:Discoveries by James Watson|Thyra]]
[[Category:Discoveries by James Watson]]
[[Category:Minor planets named for people|Thyra]]
[[Category:Minor planets named for people]]
[[Category:Named minor planets|Thyra]]
[[Category:Named minor planets]]
[[Category:S-type asteroids (SMASS)]]
[[Category:S-type asteroids (SMASS)|000115]]
[[Category:S-type asteroids (Tholen)]]
[[Category:S-type asteroids (Tholen)|000115]]
[[Category:Astronomical objects discovered in 1871|18710806]]
[[Category:Astronomical objects discovered in 1871|18710806]]

Revision as of 23:00, 11 September 2018

115 Thyra
A three-dimensional model of 115 Thyra based on its light curve.
Discovery
Discovered byJames Craig Watson
Discovery date6 August 1871
Designations
(115) Thyra
Pronunciation/ˈθaɪrə/
Named after
Thyra
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc143.31 yr (52344 d)
Aphelion2.8376 AU (424.50 Gm)
Perihelion1.92394 AU (287.817 Gm)
2.38077 AU (356.158 Gm)
Eccentricity0.19188
3.67 yr (1341.8 d)
19.13 km/s
108.401°
0° 16m 5.88s / day
Inclination11.595°
308.901°
96.946°
Earth MOID0.97246 AU (145.478 Gm)
Jupiter MOID2.63437 AU (394.096 Gm)
TJupiter3.486
Physical characteristics
Dimensions79.83±1.4 km[1]
79.83 km[2]
Mass5.3×1017 kg
Equatorial surface gravity
0.0223 m/s²
Equatorial escape velocity
0.0422 km/s
7.241 h (0.3017 d)
0.2747±0.010[1]
0.275[2]
Temperature~180 K
S[3]
7.51[1][2]

115 Thyra is a fairly large and bright inner main-belt asteroid that was discovered by Canadian-American astronomer J. C. Watson on August 6, 1871[4] and was named for Thyra, the consort of King Gorm the Old of Denmark. Based upon its spectrum, it is categorized as a stony S-type asteroid.[5]

Observations made between 1978 and 1981 produced a composite light curve with two minima and maxima. However, a subsequent study in 1983 only found a single minima and maxima. A synodical rotation period of 7.241 hours was determined. This was confirmed by observations between 1995 and 2000. The changes in brightness and color indicate a surface with an uneven composition.[6]

The asteroid has a slightly elongated shape, with a ratio of 1.20 between the lengths of the major and minor axes. The orbital longitude and latitude of the asteroid pole in degrees is estimated to be (λ0, β0) = (68°, 23°).[7] Measurements of the thermal inertia of 115 Thyra give a value of around 75 m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.[2]

References

  1. ^ a b c d Yeomans, Donald K., "115 Thyra", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
  2. ^ a b c d Delbo', Marco; Tanga, Paolo (February 2009), "Thermal inertia of main belt asteroids smaller than 100 km from IRAS data", Planetary and Space Science, vol. 57, no. 2, pp. 259–265, arXiv:0808.0869, Bibcode:2009P&SS...57..259D, doi:10.1016/j.pss.2008.06.015.
  3. ^ *JPL Small-Body Database Browser
  4. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 2013-04-07.
  5. ^ DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, vol. 202, no. 1, pp. 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 2014-03-17, retrieved 2013-04-08. {{citation}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help) See appendix A.
  6. ^ Michałowski, T.; et al. (March 2004), "Photometry and models of selected main belt asteroids I. 52 Europa, 115 Thyra, and 382 Dodona", Astronomy and Astrophysics, vol. 416, pp. 353–366, Bibcode:2004A&A...416..353M, doi:10.1051/0004-6361:20031706.
  7. ^ Kryszczyńska, A.; et al. (December 2007), "New findings on asteroid spin-vector distributions", Icarus, vol. 192, pp. 223–237, Bibcode:2007Icar..192..223K, doi:10.1016/j.icarus.2007.06.008.
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