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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]

115 Thyra
A three-dimensional model of 115 Thyra based on its light curve.
Discovery
Discovered byJames Craig Watson
Discovery date6 August 1871
Designations
MPC designation
(115) Thyra
Pronunciation/ˈθaɪərə/[1]
Named after
Thyra
Alternative designations
A871 PA
Minor planet category
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)
Semi-major axis
2.38077 AU (356.158 Gm)
Eccentricity0.19188
Orbital period (sidereal)
3.67 yr (1341.8 d)
Average orbital speed
19.13 km/s
Mean anomaly
108.401°
Mean motion
0° 16m 5.88s / day
Inclination11.595°
Longitude of ascending node
308.901°
Argument of perihelion
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
Synodic rotation period
7.241 h (0.3017 d)
Geometric albedo
0.2747±0.010[2]
0.275[3]
Temperature~180 K
Spectral type
S[4]
Absolute magnitude (H)
7.51[2][3]

    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


    1. From 'Tyra', a variant of the name.
    2. Yeomans, Donald K., "115 Thyra", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    3. 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.
    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.



    На других языках

    [de] (115) Thyra

    (115) Thyra ist ein Hauptgürtel-Asteroid. Er wurde am 6. August 1871 durch den US-amerikanischen Astronomen J. C. Watson entdeckt.
    - [en] 115 Thyra

    [es] (115) Thyra

    (115) Thyra es un asteroide que forma parte del cinturón de asteroides y fue descubierto por James Craig Watson el 6 de agosto de 1871 desde el observatorio Detroit de Ann Arbor, Estados Unidos. Está nombrado por Thyra Danebod, una antigua reina danesa.[2]

    [fr] (115) Thyra

    (115) Thyra[2] est un astéroïde de la ceinture principale découvert par James Craig Watson le 6 août 1871.

    [it] 115 Thyra

    115 Thyra è un piccolo e brillante asteroide della Fascia principale.

    [ru] (115) Тира

    (115) Тира (дат. Thyra) — астероид из группы главного пояса, который принадлежит к светлому спектральному классу S. Он был открыт 6 августа 1871 года американским астрономом Дж. К. Уотсоном в Детройтской обсерватории, США и назван в честь Тиры, жены датского короля Горма Старого[1].


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