(385446) Manwë
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Asteroid (385446) Manwë |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Cubewano |
| Major semi-axis | 44.28 AU |
| eccentricity | 0.11408 |
| Perihelion - aphelion | 38.59 AU - 48.52 AU |
| Inclination of the orbit plane | 2.7 ° |
| Sidereal period | 287.4 years (104989 days ) |
| Physical Properties | |
| Medium diameter | 160 ± 34 km |
| Dimensions | 1.941 ± 0.036 · 10 18 kg |
| Albedo | 0.1 ± 0.04 |
| Medium density | 0.75 ± 0.25 g / cm³ |
| Absolute brightness | 6.5 mag |
| history | |
| Explorer | MW Buie |
| Date of discovery | August 25, 2003 |
| Another name | 2003 UW 11 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(385446) Manwë is a trans-Neptunian object in the Kuiper belt , which is in a 4: 7 orbit resonance with Neptune . Manwë has a moon called Thorondor that is about half the size of Manwë. Hence this system is called a double asteroid system.
Discovery and naming
Manwë was discovered on August 25, 2003 by MW Buie at the Cerro Tololo Observatory . It was initially given the provisional designation 2003 UW 11 and in 2014 the identification number 385446. On April 15, 2014, it was named after the character Manwe from " The Silmarillion " by JRR Tolkien .
Track properties
Manwë orbits the sun in an elliptical orbit between 5.77 billion kilometers (38.59 AU) and 7.26 billion kilometers (48.52 AU) from its center. The orbit period of Manwë is 287.4 years. This is comparable to the orbital period of Quaoar (285.1 years) or Haumea (283.3 years). On the orbit around the sun, Manwë and Thorondor circle around their common barycentre in 110.17 days . This corresponds to 954.1 cycles in a Manwë year.
Physical Properties
Manwë has a diameter of about 160 km. The size determination is still very imprecise, the diameter can only be limited to 126–194 km. The size ratio of Manwë and Thorondor comes very close to the proportions of the Pluto-Charon system.
exploration
After their discovery, Manwë and Thorondor photos dated back to 2003, so the system's orbit is now well known. Overall, the system has been observed by various telescopes such as the Hubble Space Telescope and also earth-based telescopes, so far 54 times within 10 years. (As of Oct. 2014)
Between July 16, 2014 and October 25, 2018, Manwë and Thorondor are going through a period of mutual occultations, which should enable an improved determination of radii and density, and possibly also the shapes and colors of the two bodies.
Individual evidence
- ↑ a b c d e http://www.johnstonsarchive.net/astro/astmoons/am-385446.html
- ↑ (385446) Manwë in the Small-Body Database of the Jet Propulsion Laboratory (English).
- ↑ http://www2.lowell.edu/users/grundy/tnbs/385446_2003_QW111_Manwe-Thorondor_mutual_events.html