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{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
{{Infobox planet
| minorplanet=yes
| discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
| background=#D6D6D6
| name=115 Thyra
| name=115 Thyra
| image = 115Thyra (Lightcurve Inversion).png
| caption=A three-dimensional model of 115 Thyra based on its light curve.
| discoverer=[[James Craig Watson]]
| discoverer=[[James Craig Watson]]
| discovered=August 6, 1871
| discovered=6 August 1871
| mpc_name=(115) Thyra
| alt_names=
| alt_names=A871 PA
⚫
| named_after = [[Thyra]]
| pronounced={{IPAc-en|'|θ|aɪər|ə}}<ref>From 'Tyra', a variant of the name.</ref>
⚫
| named_after=[[Thyra]]
| mp_category=[[Main belt]]
| mp_category=[[Main belt]]
| epoch=December 31, 2006 ([[Julian day|JD]] 2454100.5)
| epoch=31 July 2016 ([[Julian day|JD]] 2457600.5)
| orbit_ref = <ref name="JPL"/>
| orbit_ref=<ref name="JPL"/>
| semimajor=356.054 Gm (2.380 [[Astronomical unit|AU]])
| semimajor={{Convert|2.38077|AU|Gm|abbr=on}}
| perihelion=287.821 Gm (1.924 AU)
| perihelion={{Convert|1.92394|AU|Gm|abbr=on}}
| aphelion={{nowrap|424.287 Gm (2.836 AU)}}
| aphelion={{Convert|2.8376|AU|Gm|abbr=on|lk=on}}
| eccentricity=0.192
| eccentricity=0.19188
| period=1341.169 d (3.67 [[Julian year (astronomy)|a]])
| period=3.67 [[Julian year (astronomy)|yr]] (1341.8 [[Julian year (astronomy)|d]])
| inclination=11.600°
| inclination=11.595°
| asc_node=308.982°
| asc_node=308.901°
| arg_peri=96.825°
| arg_peri=96.946°
| mean_anomaly=248.748°
| mean_anomaly=108.401[[Degree (angle)|°]]
| avg_speed=19.13 km/s
| avg_speed=19.13 km/s
| dimensions=79.83<ref name="Delbo2009"/> km
| dimensions={{val|79.83|1.4|ul=km}}<ref name="JPL"/><br />79.83 km<ref name="Delbo2009"/>
| mass=5.3{{e|17}} kg
| mass=5.3{{e|17}} kg
| density=<!-- ? g/cm³ -->
| density=<!-- ? g/cm³ -->
| surface_grav=0.0223 m/s²
| surface_grav=0.0223 m/s<sup>2</sup>
| escape_velocity=0.0422 km/s
| escape_velocity=0.0422 km/s
| rotation=
| rotation={{Convert|7.241|h|d|abbr=on|lk=on}}
| spectral_type=[[S-type asteroid|S]]<ref>*[http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115 JPL Small-Body Database Browser<!-- Bot generated title -->]</ref>
| spectral_type=[[S-type asteroid|S]]<ref>*[https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115 JPL Small-Body Database Browser<!-- Bot generated title -->]</ref>
| abs_magnitude=7.51<ref name="Delbo2009"/>
| abs_magnitude=7.51<ref name="JPL"/><ref name="Delbo2009"/>
| albedo=0.275<ref name="Delbo2009"/>
| albedo={{val|0.2747|0.010}}<ref name="JPL"/><br />0.275<ref name="Delbo2009"/>
| single_temperature=~180 [[kelvin|K]]
| single_temperature=~180 [[kelvin|K]]
| mean_motion={{Deg2DMS|0.26830|sup=ms}} / day
| observation_arc=143.31 yr (52344 d)
| uncertainty=0
| moid={{Convert|0.97246|AU|Gm|abbr=on}}
| jupiter_moid={{Convert|2.63437|AU|Gm|abbr=on}}
| tisserand=3.486
}}
}}

'''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. It was named for [[Thyra]], the consort of King [[Gorm the Old]] of [[Denmark]].
'''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"/>


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.<ref name="Michalowski2004"/>
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.<ref name="Michalowski2004"/>


The asteroid has a slightly elongated shape, with a ration 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 (λ<sub>0</sub>, β<sub>0</sub>) = (68°, 23°).<ref name="Kryszczynska2007"/> Measurements of the [[thermal inertia]] of 115 Thyra give a value of around 75 m<sup>–2</sup> K<sup>–1</sup> s<sup>–1/2</sup>, compared to 50 for [[lunar regolith]] and 400 for coarse sand in an atmosphere.<ref name="Delbo2009"/>
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 (λ<sub>0</sub>, β<sub>0</sub>) = (68°, 23°).<ref name="Kryszczynska2007"/> Measurements of the [[thermal inertia]] of 115 Thyra give a value of around 75 m<sup>−2</sup> K<sup>−1</sup> s<sup>−1/2</sup>, compared to 50 for [[lunar regolith]] and 400 for coarse sand in an atmosphere.<ref name="Delbo2009"/>


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

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

<ref name="JPL">{{Citation
<ref name="JPL">{{Citation
| first1 = Donald K.
| first1 = Donald K.
Line 43: Line 66:
| title = 115 Thyra
| title = 115 Thyra
| 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= 2013-03-25
| accessdate= 12 May 2016
| postscript= .
| postscript= .}}</ref>
⚫
}}</ref>


<ref name="Delbo2009">{{Citation
<ref name="Delbo2009">{{Citation
Line 55: Line 77:
| first2 = Paolo
| first2 = Paolo
| title = Thermal inertia of main belt asteroids smaller than 100 km from IRAS data
| title = Thermal inertia of main belt asteroids smaller than 100 km from IRAS data
| work = Planetary and Space Science
| journal = Planetary and Space Science
| volume = 57
| volume = 57
| issue = 2
| issue = 2
| pages = 259-265
| pages = 259–265
|date=February 2009
| month = February
⚫
| year = 2009
| doi = 10.1016/j.pss.2008.06.015
| doi = 10.1016/j.pss.2008.06.015
| bibcode = 2009P&SS...57..259D
| bibcode = 2009P&SS...57..259D
| postscript= .
| postscript= .
|arxiv = 0808.0869 | s2cid = 14517561
}}</ref>
⚫
}}</ref>


<ref name="Michalowski2004">{{Citation
<ref name="Michalowski2004">{{Citation
Line 91: Line 113:
| display-authors = 1
| display-authors = 1
| title = Photometry and models of selected main belt asteroids I. 52 Europa, 115 Thyra, and 382 Dodona
| title = Photometry and models of selected main belt asteroids I. 52 Europa, 115 Thyra, and 382 Dodona
| work = Astronomy and Astrophysics
| journal = Astronomy and Astrophysics
| volume = 416
| volume = 416
| pages = 353–366
| pages = 353–366
|date=March 2004
| month = March
⚫
| year = 2004
| doi = 10.1051/0004-6361:20031706
| doi = 10.1051/0004-6361:20031706
| bibcode = 2004A&A...416..353M
| bibcode = 2004A&A...416..353M
| postscript= .
| postscript= .| doi-access= free
}}</ref>
}}</ref>


<ref name="Kryszczynska2007">{{Citation
<ref name="Kryszczynska2007">{{Citation
Line 116: Line 137:
| display-authors = 1
| display-authors = 1
| title = New findings on asteroid spin-vector distributions
| title = New findings on asteroid spin-vector distributions
| work = Icarus
| journal = Icarus
| volume = 192
| volume = 192
| pages = 223-237
| pages = 223–237
|date=December 2007
| month = December
| year = 2007
| issue = 1
| 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
⚫
{{Minor planets navigator|114 Kassandra|116 Sirona}}
|last1 = DeMeo
{{MinorPlanets_Footer}}
|first1 = Francesca E.
|last2 = Binzel
|first2 = Richard P.
|last3 = Slivan
|first3 = Stephen M.
|last4 = Bus
|first4 = Schelte J.
|display-authors = 1
|title = An extension of the Bus asteroid taxonomy into the near-infrared
|journal = Icarus
|volume = 202
|issue = 1
|pages = 160–180
⚫
|date = July 2009
|doi = 10.1016/j.icarus.2009.02.005
|bibcode = 2009Icar..202..160D
|url = http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf
|accessdate = 2013-04-08
⚫
|postscript = .
|url-status = dead
|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
}} See appendix A.</ref>


}} <!-- end of reflist -->
⚫
{{DEFAULTSORT:Thyra}}
⚫
[[Category:Main Belt asteroids]]
[[Category:Asteroids named for people]]
⚫
[[Category:Astronomical objects discovered in 1871]]


== External links ==
{{S-beltasteroid-stub}}
* {{AstDys|115}}
* {{JPL small body}}

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

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

Latest revision as of 19:44, 25 December 2023

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/ˈθaɪərə/[1]
Named after
Thyra
A871 PA
Main belt
Orbital characteristics[2]
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[2]
79.83 km[3]
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[2]
0.275[3]
Temperature~180 K
S[4]
7.51[2][3]

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[5] 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.[6]

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.[7]

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°).[8] 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.[3]

References

[edit]
  1. ^ From 'Tyra', a variant of the name.
  2. ^ a b c d Yeomans, Donald K., "115 Thyra", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
  3. ^ 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, 57 (2): 259–265, arXiv:0808.0869, Bibcode:2009P&SS...57..259D, doi:10.1016/j.pss.2008.06.015, S2CID 14517561.
  4. ^ *JPL Small-Body Database Browser
  5. ^ "Numbered Minor Planets 1–5000", Discovery Circumstances, IAU Minor Planet center, retrieved 7 April 2013.
  6. ^ DeMeo, Francesca E.; et al. (July 2009), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF), Icarus, 202 (1): 160–180, Bibcode:2009Icar..202..160D, doi:10.1016/j.icarus.2009.02.005, archived from the original (PDF) on 17 March 2014, retrieved 8 April 2013. See appendix A.
  7. ^ 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, 416: 353–366, Bibcode:2004A&A...416..353M, doi:10.1051/0004-6361:20031706.
  8. ^ Kryszczyńska, A.; et al. (December 2007), "New findings on asteroid spin-vector distributions", Icarus, 192 (1): 223–237, Bibcode:2007Icar..192..223K, doi:10.1016/j.icarus.2007.06.008.
[edit]
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