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{{Infobox planet
{{Infobox planet
| minorplanet=yes
| discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
| background=#FFFFC0
| name=115 Thyra
| name=115 Thyra
| image = [[File:115Thyra (Lightcurve Inversion).png|250px]]
| image=[[File:115Thyra (Lightcurve Inversion).png|250px]]
| caption=A three-dimensional model of 115 Thyra based on its light curve.
| 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
| alt_names=
| alt_names=
| named_after = [[Thyra]]
| 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 km<ref name="Delbo2009"/>
| 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/s²
| 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>*[http://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<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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| publisher = NASA Jet Propulsion Laboratory
| publisher = NASA Jet Propulsion Laboratory
| url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115
| url = http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=115
| accessdate= 2013-03-25
| accessdate= 12 May 2016
| postscript= .
| postscript= .
}}</ref>
}}</ref>

Revision as of 01:19, 13 May 2016

115 Thyra
A three-dimensional model of 115 Thyra based on its light curve.
Discovery
Discovered byJames Craig Watson
Discovery date6 August 1871
Designations
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, retrieved 2013-04-08. 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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