2014 HZ 199
|
Asteroid 2014 HZ 199 |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | DO (E SDO ) or CKBO ( «Hot» ), «Distant Object» |
| Major semi-axis | 43,365 AU |
| eccentricity | 0.155 |
| Perihelion - aphelion | 36.637 AU - 50.092 AU |
| Inclination of the orbit plane | 27.8 ° |
| Length of the ascending node | 57.1 ° |
| Argument of the periapsis | 86 ° |
| Time of passage of the perihelion | July 6, 1968 |
| Sidereal period | 285 a 6.8 M |
| Mean orbital velocity | 4.486 km / s |
| Physical Properties | |
| Medium diameter | approx. 479 km |
| Albedo | 0.07-0.09 |
| Absolute brightness | 5.0 - 5.2 mag |
| history | |
| Explorer |
Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman |
| Date of discovery | April 29, 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 HZ 199 is a large trans-Neptunian object in the Kuiper Belt , which is classified as an extended Scattered Disk Object or as a Cubewano in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .
discovery
2014 HZ 199 was tested on April 29, 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 17, 2016.
After its discovery, in 2014 HZ 199 could be identified on photos taken as part of the Near Earth Asteroid Tracking Program at the Palomar Observatory up to April 11, 2002, thus extending its observation period by 12 years calculate its orbit more precisely. In September 2018, a total of 265 observations over a period of 17 years were available. The last observation to date was also carried out in April 2018 as part of the Pan-STARRS project. (As of February 25, 2019)
properties
Orbit
2014 HZ 199 orbits the sun in 285.57 years on a slightly elliptical orbit between 36.64 AU and 50.09 AU from its center. The orbital eccentricity is 0.155, the orbit is 27.81 ° inclined to the ecliptic . Currently, the planetoid is 41.32 AU from the sun. He last passed through perihelion in 1968, so the next perihelion should take place in 2254.
Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center 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 around 479 km is currently assumed, based on a reflectivity of 7% and an absolute brightness of 5.2 m . The apparent brightness of 2014 HZ 199 is 21.39 m .
Since it can be assumed that 2014 HZ 199 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 expects that it is at 2014 HZ 199 to possibly is a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2018 | 443.0 | Johnston |
| 2018 | 479.0 | 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 14HZ199 . SwRI (Space Science Department). Retrieved February 25, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 25, 2019.
- ↑ a b c 2014 HZ199 at the IAU Minor Planet Center (English) Retrieved on February 25, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPEC 2016-0137: 2014 HZ199 . IAU . July 17, 2016. Retrieved February 25, 2019.
- ↑ 2014 HZ199 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 25, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 25, 2019.
- ↑ 2014 HZ199 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 25, 2019.