2011 HP 83
Asteroid 2011 HP 83 |
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Properties of the orbit ( animation ) | |
Orbit type |
SDO , "Distant Object" |
Major semi-axis | 53.132 AU |
eccentricity | 0.32 |
Perihelion - aphelion | 36.124 AU - 70.141 AU |
Inclination of the orbit plane | 28.6 ° |
Length of the ascending node | 12.3 ° |
Argument of the periapsis | 208.6 ° |
Time of passage of the perihelion | May 18, 2001 |
Sidereal period | 387 a 3.6 M |
Mean orbital velocity | 4.053 km / s |
Physical Properties | |
Medium diameter | approx. 315 km |
Albedo | 0.08-0.09 |
Absolute brightness | 5.6 - 5.9 mag |
history | |
Explorer | La Silla Observatory |
Date of discovery | April 29, 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. |
2011 HP 83 is a large trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of rail dynamics . Due to its size, the asteroid is one of the dwarf planet candidates .
discovery
2007 JF 45 was discovered on April 29, 2011 by a team of astronomers at the La Silla Observatory ( Chile ) of the European Southern Observatory (ESO).
The observation arc of the planetoid begins with the official discovery observation on April 29, 2011. So far, the planetoid has only been observed by the La Silla and Cerro Tololo observatories (Chile). In April 2017, there were only 11 observations over a period of 2 years. The last observation so far was carried out again at the La Silla Observatory in June 2012. (As of March 27, 2019)
properties
Orbit
2011 HP 83 orbits the sun in 387.30 years in a slightly elliptical orbit between 36.12 AU and 70.14 AU from its center. The orbit eccentricity is 0.320, the orbit is 28.64 ° inclined to the ecliptic . The planetoid is currently 37.61 AU from the Sun. He last passed through perihelion in 2001, so the next perihelion should take place in 2388.
Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as SDO ; the latter also generally lists it as a "distant object" .
size
A diameter of 315 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.9 m . Based on this diameter, the total area is about 312,000 km². The 2011 HP 83 apparent brightness is 21.48 m .
Since it is conceivable that 2011 HP 83 is in hydrostatic equilibrium due to its size and could therefore be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2011 HP 83 to perhaps is a dwarf planet.
year | Dimensions km | source |
---|---|---|
2018 | 336.0 | Johnston |
2018 | 315.0 | 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 11HP83 . SwRI (Space Science Department). Retrieved March 27, 2019.
- ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 27, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 27, 2019.
- ↑ a b c 2011 HP83 at the IAU Minor Planet Center (English) Retrieved on March 27, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ 2011 HP83 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 27, 2019.
- ↑ 2011 HP83 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 27, 2019.