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279 Thule
Discovery
Orbital diagram
Discovered by	Johann Palisa
Discovery date	25 October 1888
Designations
MPC designation	(279) Thule
Pronunciation	/ˈθjuːliː/^[1]
Alternative designations	A888 UA, 1920 GA 1923 RA, 1927 EC 1954 FF^[2]
Minor planet category	Asteroid belt (Thule)
Adjectives	Thulean /ˈθjuːliən/^[3]
Orbital characteristics^[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	125.34 yr (45780 d)
Aphelion	4.4617880 AU (667.47398 Gm)
Perihelion	4.2367660 AU (633.81117 Gm)
Semi-major axis	4.3492770 AU (650.64258 Gm)
Eccentricity	0.025869
Orbital period (sidereal)	9.07 yr (3313.0 d)
Mean anomaly	62.75874°
Mean motion	0° 6^m 31.184^s / day
Inclination	2.323774°
Longitude of ascending node	72.46791°
Argument of perihelion	42.36797°
Physical characteristics
Dimensions	126.59±3.7 km (IRAS)^[2]
Synodic rotation period	23.896 h (0.9957 d)^[2]
Geometric albedo	0.0412±0.003^[2]
Temperature	133 K
Spectral type	B−V=0.75^[2] U−B=0.32^[2] D (Tholen)^[2] X (SMASSII)^[2]
Absolute magnitude (H)	8.57^[2]

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 after the ultimate northern land of Thule.

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.

Known members as of May 2021
Name	semimajor axis (au)	period (years)	eccentricity	inclination (°)	absolute magnitude	Size (km)
279 Thule	4.269	8.82	0.0432	2.334	8.53	126.59±3.7
(185290) 2006 UB219	4.290	8.89	0.1335	7.132	13.84	4.1–10.1
(186024) 2001 QG207	4.278	8.85	0.2513	3.238	14.53	3.0–7.4
2006 SJ₄₂	4.286	8.87	0.0465	5.501	15.1	2.3–5.7
2008 RE₉₃	4.288	8.88	0.1161	3.497	15.49	1.9–4.7
2014 WN₅₀₄	4.297	8.91	0.2312	3.193	15.5	1.9–4.7
2014 QX₂₃₁	4.283	8.86	0.3722	5.935	16.5	1.2–3.0

References

^ "Thule". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "279 Thule". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 May 2016.
^ "Thulean". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ 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. S2CID 53965791.

External links

279 Thule at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
279 Thule at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

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278 Paulina 279 Thule 280 Philia

Small Solar System bodies

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Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

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