(523759) 2014 WK 509
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Asteroid (523759) 2014 WK 509 |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | DO (E SDO ) or SDO , "Distant Object" |
| Major semi-axis | 50.745 AU |
| eccentricity | 0.209 |
| Perihelion - aphelion | 40.125 AU - 61.366 AU |
| Inclination of the orbit plane | 14.5 ° |
| Length of the ascending node | 41 ° |
| Argument of the periapsis | 135.6 ° |
| Time of passage of the perihelion | April 23, 2107 |
| Sidereal period | 361 a 5.9 M. |
| Mean orbital velocity | 4.147 km / s |
| Physical Properties | |
| Medium diameter | approx. 574 |
| Albedo | 0.09 |
| Absolute brightness | 4.4 - 4.5 mag |
| history | |
| Explorer | Pan-STARRS |
| Date of discovery | 22nd November 2014 |
| 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. | |
(523759) 2014 WK 509 is a large trans-Neptunian object , which is classified as a scattered disc object or a detached object in terms of path dynamics . Because of its size, the asteroid is a dwarf planet candidate .
discovery
2014 WK 509 was discovered on November 22, 2014 with the 1.8 m Pan-STARRS telescope (PS1) at the Haleakalā Observatory ( Maui ). The discovery was announced on July 17, 2016. The planetoid received on 25 September 2018 the IAU , the Minor Planet -number 523759 .
After its discovery, in 2014 WK 509 could be identified on photos from September 14, 2010, which were also taken at the Pan-STARRS telescope, and its observation period was extended by 4 years in order to calculate its orbit more precisely. In October 2018, a total of 138 observations were made over a period of 8 years. The last observation so far was carried out in December 2017 on the Pan-STARRS telescope. (As of February 22, 2019)
properties
Orbit
2014 WK 509 orbits the sun in 361.49 years on a strongly elliptical orbit between 40.12 AU and 61.37 AU from its center. The eccentricity of the orbit is 0.209, the orbit is inclined 14.53 ° to the ecliptic . The planetoid is currently 52.52 AU from the sun and 52.16 from the earth (as of February 1, 2019). The next time it passes through perihelion in 2107, the last perihelion should have taken place around 1745.
Marc Buie ( DES ) classifies it as an extended SDO (ESDO or DO ), while the Minor Planet Center classifies it as an SDO / Centaur and more generally as a "Distant Object" .
size
A diameter of around 550 to 650 km is currently assumed, based on a reflectivity of 9% and an absolute brightness of 4.4 to 4.5 m ; however, this is fraught with some uncertainties. The apparent magnitude of 2014 WK 509 is 21.78 m .
Since it can be assumed that 2014 WK 509 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should nevertheless meet the criteria for classification as a dwarf planet . Mike Brown assumes that 2014 WK 509 is likely a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2018 | 584.0 | Johnston |
| 2018 | 574.0 | Brown |
| The most precise determination is marked in bold . | ||
See also
- List of asteroids
- List of trans-Neptunian objects
- List of dwarf planets of the solar system
- List of moons from asteroids
Web links
- How many dwarf planets are there in the outer solar system? Current list of the largest TNOs from Mike Brown
- Free the dwarf planets! Mike Brown's column on the IAU and the dwarf planets regarding their classifications (23 August 2011)
Individual evidence
- ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 523759 . SwRI (Space Science Department). Retrieved February 22, 2019.
- ↑ a b c (523759) 2014 WK509 at the IAU Minor Planet Center (English) Retrieved on February 22, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPEC 2016-O104: 2014 WK509 . IAU . July 17, 2016. Retrieved February 22, 2019.
- ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved February 22, 2019.
- ↑ (523759) 2014 WK509 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 22, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 22, 2019.
- ↑ (523759) 2014 WK509 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved February 22, 2019.
- ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 22, 2019.