279 Thule

Thule, minor planet designation: 279 Thule, is a large asteroid from the outer asteroid belt. It is classified as a D-type asteroid and is probably composed of organic-rich silicates, carbon and anhydrous silicates. Thule was the first asteroid discovered with a semi-major axis greater than 4 AU. It was discovered by Johann Palisa on 25 October 1888 in Vienna and was named aptly after the ultimate northern land of Thule.

This article is about the main-belt asteroid. For the Kuiper belt object once nicknamed Ultima Thule, see 486958 Arrokoth.
279 Thule
Discovery
Discovered byJohann Palisa
Discovery date25 October 1888
Designations
(279) Thule
Pronunciation/ˈθjuːliː/[1]
1927 EC, 1954 FF, A920 GA, A923 RA[2]
Asteroid belt (Thule)
AdjectivesThulean /ˈθjuːliən/[3]
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc125.34 yr (45780 d)
Aphelion4.4617880 AU (667.47398 Gm)
Perihelion4.2367660 AU (633.81117 Gm)
4.3492770 AU (650.64258 Gm)
Eccentricity0.025869
9.07 yr (3313.0 d)
62.75874°
0° 6m 31.184s / day
Inclination2.323774°
72.46791°
42.36797°
Physical characteristics
Dimensions126.59±3.7 km (IRAS)[2]
23.896 h (0.9957 d)[2]
0.0412±0.003[2]
Temperature133 K
B−V=0.75[2]
U−B=0.32[2]
D (Tholen)[2]
X (SMASSII)[2]
8.57[2]

    Thule asteroids

    Thule was the first discovered member of the Thule dynamical group, which as of 2008 is known to consist of three objects: 279 Thule, (186024) 2001 QG207, and (185290) 2006 UB219.[4] The orbits of these bodies are unusual. They orbit in the outermost edge of the asteroid belt in a 4:3 orbital resonance with Jupiter, the result of the periodic force Jupiter exerts on a body with Thule's orbital period, in the same way (though with the reverse effect) as the Kirkwood gaps in the more inner parts of the asteroid belt.

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    References
    1. "Thule". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    2. "279 Thule". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
    3. "Thulean". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    4. Brož, M.; Vokrouhlický, D. (2008). "Asteroid families in the first-order resonances with Jupiter". Monthly Notices of the Royal Astronomical Society. 390 (2): 715–732. arXiv:1104.4004. Bibcode:2008MNRAS.390..715B. doi:10.1111/j.1365-2966.2008.13764.x.


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