2011 HP 83

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Asteroid
2011 HP 83
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
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.

Provisions of the diameter for 2011 HP 83
year Dimensions km source
2018 336.0 Johnston
2018 315.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 11HP83 . SwRI (Space Science Department). Retrieved March 27, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 27, 2019.
  3. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 27, 2019.
  4. ↑ a b c 2011 HP83 at the IAU Minor Planet Center (English) Retrieved on March 27, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ 2011 HP83 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 27, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ 2011 HP83 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  8. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 27, 2019.