2017 OF 69
|
Asteroid 2017 OF 69 |
|
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type |
Plutino , "Distant Object" |
| Major semi-axis | 39.631 AU |
| eccentricity | 0.207 |
| Perihelion - aphelion | 31,419 AU - 47,843 AU |
| Inclination of the orbit plane | 13.7 ° |
| Length of the ascending node | 218.5 ° |
| Argument of the periapsis | 215.4 ° |
| Time of passage of the perihelion | November 4, 2094 |
| Sidereal period | 249 a 5.9 M |
| Mean orbital velocity | 4.693 km / s |
| Physical Properties | |
| Medium diameter | approx. 533 km |
| Albedo | 0.09 |
| Absolute brightness | 4.6 likes |
| history | |
| Explorer |
David J. Tholen Scott S. Sheppard Chadwick A. Trujillo |
| Date of discovery | July 26, 2017 |
| 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. | |
2017 OF 69 is a large trans-Neptunian object in the Kuiper belt , which is classified as Plutino in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .
discovery
2017 OF 69 was discovered on July 26, 2017 by a team of astronomers consisting of Dave Tholen , Scott Sheppard and Chad Trujillo with the 8.2 m Subaru telescope at the Mauna Kea Observatory ( Hawaii ). The discovery was announced on May 31, 2018.
After its discovery, OF 69 could be identified in photos up to June 10, 2012, which were taken as part of the Pan-STARRS program, and thus its observation period was extended by five years in order to calculate its orbit more precisely. In June 2018, a total of 96 observations over a period of 7 years were available. The last observation to date was again carried out at the Mauna Kea Observatory in June 2018. (As of March 2, 2019)
properties
Orbit
2017 OF 69 orbits the sun in 249.49 years on a slightly elliptical orbit between 31.42 AU and 47.84 AU from its center. The orbit eccentricity is 0.207, the orbit is inclined 13.65 ° with respect to the ecliptic . The planetoid is currently 43.69 AU from the Sun. He will next pass perihelion in 2094, so the last perihelion should have occurred in 1845.
Marc Buie ( DES ) classifies the planetoid as Plutino , 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” .
size
A diameter of around 533 km is currently assumed, based on a reflectivity of 9% and an absolute brightness of 4.6 m ; this is, however, fraught with some uncertainties, since the estimates range from 380 to 680 km due to the unknown albedo. Assuming a diameter of 533 km, this results in a total surface of around 892,000 km 2 . The apparent magnitude of 2017 OF 69 is 21.07 m .
2017 OF 69 is therefore quite large for the comparatively late discovery of a nearby Kuiper belt object; it is the fifth largest Plutino after Pluto , Orcus , 2007 AZ 84 and Ixion and also the largest that was discovered since Orcus 2004. It is unclear why the asteroid was not previously covered by any sky survey ; it is neither in a particularly dense region of the sky nor far enough south that most surveys of the northern hemisphere would have ignored it, which is why such a late discovery of such a large plutino is rather surprising.
Mike Brown does not yet list OF 69 on his website about the dwarf planet candidates in 2017 ; According to Brown's 5-class system, it should nevertheless meet the criteria for classification as a probable dwarf planet , since it can be assumed that 2017 OF 69 is in hydrostatic equilibrium due to its size and must therefore be largely round.
| year | Dimensions km | source |
|---|---|---|
| 2018 | 533.0 | Johnston |
| 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 17OF69 . SwRI (Space Science Department). Retrieved March 2, 2019.
- ↑ a b c 2017 OF69 at the IAU Minor Planet Center (English) Retrieved on March 2, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPEC 2018-K109: 2017 OF69 . IAU . May 31, 2018. Retrieved March 2, 2019.
- ↑ 2017 OF69 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.
- ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 2, 2019.
- ↑ 2017 OF69 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- ↑ Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 2, 2019.