10370 Hylonome

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10370 Hylonome
Discovery [1]
Discovered by David C. Jewitt and Jane Luu
Discovery site Mauna Kea Observatory
Discovery date February 27, 1995
MPC designation 10370
1995 DW2
Orbital characteristics[2]
Epoch November 30, 2008
Aphelion 31.3488 AU
Perihelion 18.9152 AU
25.132 AU
Eccentricity 0.247367
126 y (46019.2 d)
Inclination 4.144°
Physical characteristics
Dimensions 70 ± 20 km [3]
21.9 [4]

10370 Hylonome (/hˈlɒnəm/; from Greek: ‘Υλονομη) is a small Solar System body orbiting in the outer Solar System. It belongs to the class of icy objects that are known as centaurs, with an orbit that crosses the orbit of Neptune and grazes that of Uranus. It was discovered on February 27, 1995.[1]

10370 Hylonome was named for Hylonome, a female centaur in Greek mythology.

Observations with the infrared Spitzer Space Telescope show a diameter of 70 km (43 mi) plus or minus 20 km (50 to 90 km in diameter), or a 35 km radius.[3]


The orbits of centaurs are unstable due to perturbations by the giant planets. Currently Uranus controls Hylonome's perihelion and Neptune its aphelion.[5] It is estimated to have a relatively long orbital half-life of about 6.37 Myr.[5] In the year 3478, Hylonome will pass within ~85 Gm of Uranus and its semi-major axis will be reduced to 23.5 AU.[6]

See also[edit]


  1. ^ a b "Discovery Circumstances: Numbered Minor Planets (10001)-(15000)". IAU: Minor Planet Center. Archived from the original on 11 January 2009. Retrieved December 20, 2008. 
  2. ^ "(10370) Hylonome". AstDyS. Italy: University of Pisa. Retrieved December 20, 2008. 
  3. ^ a b John Stansberry; Will Grundy; Mike Brown; Dale Cruikshank; John Spencer; David Trilling; et al. (2007-02-20). "Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope". arXiv:astro-ph/0702538 [astro-ph]. 
  4. ^ "AstDyS (10370) Hylonome Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-09-16. Retrieved 2009-09-13. 
  5. ^ a b Horner, J.; Evans, N.W.; Bailey, M. E. (2004). "Simulations of the Population of Centaurs I: The Bulk Statistics". Monthly Notices of the Royal Astronomical Society 354 (3): 798–810. arXiv:astro-ph/0407400. Bibcode:2004MNRAS.354..798H. doi:10.1111/j.1365-2966.2004.08240.x. 
  6. ^ "Fifty clones of Centaur 10370 Hylonome all passing within ~85Gm of Uranus in 3478 Oct". Archived from the original on 2009-04-29. Retrieved 2009-04-25.  (Solex 10). Accessed 2009-04-25.

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