(471318) 2011 JF 31
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Asteroid (471318) 2011 JF 31 |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | DO (E SDO ), or CKBO ( «Hot» ) «Distant Object» |
| Major semi-axis | 41.673 AU |
| eccentricity | 0.131 |
| Perihelion - aphelion | 36.226 AU - 47.12 AU |
| Inclination of the orbit plane | 27.6 ° |
| Length of the ascending node | 236.8 ° |
| Argument of the periapsis | 254.1 ° |
| Time of passage of the perihelion | October 23, 1951 |
| Sidereal period | 269 a 0.4 M |
| Mean orbital velocity | 4.576 km / s |
| Physical Properties | |
| Medium diameter | approx. 373 km |
| Albedo | 0.08-0.09 |
| Absolute brightness | 5.2 - 5.6 mag |
| history | |
| Explorer | La Silla Observatory |
| Date of discovery | May 23, 2011 |
| 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. | |
(471318) 2011 JF 31 is a large trans-Neptunian object in the Kuiper belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbit dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .
discovery
2011 JF 31 was discovered on May 23, 2011 by a team of astronomers at the La Silla Observatory ( Chile ) of the European Southern Observatory (ESO). The planetoid was later given the minor planet number 471318 by the IAU .
After its discovery in 2011, JF 31 could be identified on photos taken with the Pan-STARRS telescope (PS1) at Haleakalā Observatory ( Maui ) up to April 13, 2011, and thus extended its observation period by twenty days so to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In April 2017, a total of 111 observations were made over a period of 5 years. The last observation so far was carried out in July 2015, also at the Pan-STARRS telescope. (As of March 12, 2019)
properties
Orbit
2011 JF 31 orbits the sun in 269.03 years on a slightly elliptical orbit between 36.23 AU and 47.12 AU from its center. The orbital eccentricity is 0.131, the orbit is 27.65 ° inclined to the ecliptic . The planetoid is currently 42.40 AU from the sun. He passed through perihelion for the last time in 1951, so the next perihelion is likely to take place in 2220.
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 and rotation
A diameter of 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6 m . Assuming a diameter of 373 km, this results in a total surface of around 437,000 km 2 . The apparent magnitude of 2011 JF 31 is 21.81 m .
Since it is conceivable that 2011 JF 31 will be in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2011 JF 31 to perhaps is a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2018 | 404.0 | Johnston |
| 2018 | 373.0 | 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 471318 . SwRI (Space Science Department). Retrieved March 12, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 12, 2019.
- ↑ a b c (471318) 2011 JF31 at the IAU Minor Planet Center (English) Accessed March 12, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 12, 2019.
- ↑ (471318) 2011 JF31 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 12, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 12, 2019.
- ↑ (471318) 2011 JF31 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 12, 2019.