2014 QW 441
Asteroid 2014 QW 441 |
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Properties of the orbit ( animation ) | |
Orbit type | DO (E SDO ) or CKBO ( «Hot» ), «Distant Object» |
Major semi-axis | 44,303 AU |
eccentricity | 0.103 |
Perihelion - aphelion | 39.741 AU - 48.865 AU |
Inclination of the orbit plane | 28.8 ° |
Length of the ascending node | 162.7 ° |
Argument of the periapsis | 202.3 ° |
Time of passage of the perihelion | June 21, 2019 |
Sidereal period | 294 a 10.7 M |
Mean orbital velocity | 4,438 km / s |
Physical Properties | |
Medium diameter | approx. 457 km |
Albedo | 0.06-0.09 |
Absolute brightness | 5.2 - 5.4 mag |
history | |
Explorer |
Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman |
Date of discovery | 20th August 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. |
2014 QW 441 is a large trans-Neptunian object in the Kuiper Belt , which is classified as an extended Scattered Disc Object (DO) or as a Cubewano in terms of rail dynamics . Because of its size, the asteroid is a dwarf planet candidate .
discovery
2014 QW 441 was tested on August 20, 2014 by an astronomical team consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, as part of the Pan-STARRS project with the 1.8-m –Ritchey-Chretien – Telescope (PS1) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 16, 2016.
After its discovery, in 2014 QW 441 could be identified in photos taken as part of the Spacewatch program of the Kitt Peak Observatory at the Steward Observatory ( Arizona ) up to September 12, 2001, thus extending its observation period by 13 years in order to calculate its orbit more precisely. In September 2018, a total of 222 observations were made over a period of 17 years. The last observation so far was carried out in September 2018 at the Purple Mountain Observatory ( People's Republic of China ). (As of March 2, 2019)
properties
Orbit
2014 QW 441 orbits the sun in 294.89 years on a slightly elliptical orbit between 39.74 AU and 48.87 AU from its center. The orbit eccentricity is 0.103, the orbit is inclined 28.80 ° with respect to the ecliptic . Currently, the planetoid is 48.09 AU from the sun. He passed perihelion for the last time in 2019, so the next perihelion should take place in 2314.
Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center does not have a specific classification; the latter classifies it as a non-SDO and generally as a “distant object” . The Johnston's Archive, however, lists him as Cubewano , whereby he would belong to the "hot" classic KBO in terms of rail dynamics .
size
A diameter of 457 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.4 m . Assuming a diameter of 457 km, this results in a total surface of around 656,000 km 2 . The apparent magnitude of 2014 QW 441 is 21.46 m .
Since it can be assumed that 2014 QW 441 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2014 QW 441 to possibly is a dwarf planet.
year | Dimensions km | source |
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2018 | 404.0 | Johnston |
2018 | 457.0 | Brown |
The most precise determination is marked in bold . |
See also
- List of trans-Neptunian objects
- List of dwarf planets of the solar system
- List of asteroids
- 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 14QW441 . SwRI (Space Science Department). Retrieved March 2, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 2, 2019.
- ↑ a b c 2014 QW441 at the IAU Minor Planet Center (English) Retrieved on March 2, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPEC 2016-O54: 2014 QW441 . IAU . July 16, 2016. Retrieved March 2, 2019.
- ↑ 2014 QW441 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 2, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 2, 2019.
- ↑ 2014 QW441 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 March 2, 2019.