 Hubble Space Telescope image of Hylonome taken in 2009 | |
| Discovery[1] | |
|---|---|
| Discovered by | D. C. Jewitt J. X. Luu |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 27 February 1995 |
| Designations | |
| (10370) Hylonome | |
| Pronunciation | /haɪˈlɒnəmiː/[2] |
Named after | ὙλονόμηHylonomē (Greek mythology)[3] |
| 1995 DW2 | |
| centaur[4] · distant[1] Neptune-crosser Uranus-grazer | |
| Symbol | .svg) (astrological) |
| Orbital characteristics[4] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 15.27 yr (5,576 days) |
| Aphelion | 31.393AU |
| Perihelion | 18.910 AU |
| 25.152 AU | |
| Eccentricity | 0.2482 |
| 126.14yr (46,073 days) | |
| 63.271° | |
| 0° 0m 28.08s / day | |
| Inclination | 4.1443° |
| 178.08° | |
| 7.0279° | |
| Jupiter MOID | 13.4570 AU |
| TJupiter | 4.4550 |
| Physical characteristics | |
| 70±20 km[5] 74±16 km[6] | |
| 0.051±0.030[6] | |
| BR(intermed. blue-red)[7][8] | |
| 8.6[4] · 9.08±0.04(R)[9] · 9.250±0.131(R)[10] · 9.35[7][11] · 9.51±0.08[6] · 9.53[12][13] | |
10370 Hylonome (/haɪˈlɒnəmiː/;provisional designation1995 DW2) is aminor planet orbiting in theouter Solar System. The dark and icy body belongs to the class ofcentaurs and measures approximately 72 kilometers (45 miles) in diameter. It was discovered on 27 February 1995, by English astronomerDavid C. Jewitt and Vietnamese American astronomerJane Luu at the U.S.Mauna Kea Observatory in Hawaii, and later named after the mythological creatureHylonome.[3][1]
Centaurs are a large population oficy bodies in transition betweentrans-Neptunian objects (TNOs) andJupiter-family comets (JFCs), their orbits being unstable due toperturbations by thegiant planets.[6] Currently,Uranus controls Hylonome'sperihelion andNeptune its aphelion.[14]
Hylonome is a carbonaceousC-type body that orbits the Sun in theouter main-belt at a distance of 18.9–31.4 astronomical units (AU) once every 126 years and 2 months (46,073 days). Its orbit has aneccentricity of 0.25 and aninclination of 4° with respect to theecliptic.[4] It is aNeptune-crosser, and an outer-grazer of the orbit of Uranus, which it hence does notcross. Itsminimum orbital intersection distance with Neptune and Uranus is 0.35854 and 0.52875 AU, respectively.[1]
It is estimated to have a relatively long orbital half-life of about 6.37 million years.[14]
Thisminor planet was named forHylonome, a femalecentaur inGreek mythology. In the epic tragedy, she lost her husband, the handsome centaurCyllarus, who was accidentally killed by a spear. Heartbroken, she then took her own life by throwing herself on the spear.[3] The officialnaming citation was published on 26 July 2000 (M.P.C.41030).[15]
A symbol derived from that for2060 Chiron,
, was devised in the late 1990s by German astrologer Robert von Heeren. It replaces Chiron's K with a Greek capitalupsilon (Υ) for Hylonome (Ὑλονόμη).[16]
Observations with the infraredSpitzer Space Telescope indicate a diameter of70±20 kilometers,[5] whereas theCollaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous bodies of 0.057, giving it a diameter of 75.1 kilometers with anabsolute magnitude of 9.35.[7][17]
A study in 2014, using data fromSpitzer's Multiband Imaging Photometer (MIPS) andHerschel's Photodetector Array Camera and Spectrometer, gave a lowalbedo of0.051±0.030 and a diameter of74±16 kilometers, based on an absolutemagnitude of9.51±0.08. The study concluded that among the observed population of centaurs, there is no correlation between their sizes, albedos, and orbital parameters. However, the smaller the centaur, the more reddish it is.[6]
