2015 KF 172

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Asteroid
2015 KF 172
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 69.781  AU
eccentricity 0.454
Perihelion - aphelion 38.128 AU - 101.434 AU
Inclination of the orbit plane 12 °
Length of the ascending node 19 °
Argument of the periapsis 319.2 °
Time of passage of the perihelion November 29, 2103
Sidereal period 582 a 11.2 M
Mean orbital velocity 3.536 km / s
Physical Properties
Medium diameter approx. 329 km
Albedo 0.08-0.09
Absolute brightness 5.5 - 5.8 mag
history
Explorer Scott S. Sheppard
Date of discovery May 20, 2015
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.

2015 KF 172 is a large trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of its orbit dynamics . Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2015 KF 172 was discovered on May 20, 2015 by Scott Sheppard with the 4.0 m Víctor M. Blanco telescope ( DE Cam) at the Cerro Tololo Observatory ( Chile ). The discovery was announced on May 31, 2018.

The observation arc of the planetoid begins with the official discovery observation on May 20, 2015. So far, the planetoid has only been observed by the Cerro Tololo and Las Campanas observatories (Chile). In May 2018, there were only 8 observations over a period of 3 years. The last observation so far was made in May 2018 at the Las Campanas Observatory. (As of March 24, 2019)

properties

Orbit

2015 KF 172 orbits the sun in 582.93 years in a strongly elliptical orbit between 38.12  AU and 101.43 AU from its center. The orbit eccentricity is 0.454, the orbit is inclined 12.03 ° to the ecliptic . The planetoid is currently 63.04 AU from the Sun. The next time it passes through perihelion in 2103, the last perihelion should have taken place in 1520.

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 329 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.8  m . Based on this diameter, the total surface area is around 340,000 km 2 . The apparent magnitude of 2015 KF 172 is 23.70  m .

Since it is conceivable that 2015 KF 172 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 believes that it is in 2015 KF 172 to perhaps is a dwarf planet.

Provisions of the diameter for 2015 KF 172
year Dimensions km source
2018 352.0 Johnston
2018 329.0 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 15KF172 . SwRI (Space Science Department). Retrieved March 25, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 25, 2019.
  3. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 25, 2019.
  4. ↑ a b c 2015 KF172 at IAU Minor Planet Center (English) Retrieved March 25, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ MPC : MPEC 2018-K118: 2015 KF172 . IAU . May 31, 2018. Retrieved March 25, 2019.
  7. ↑ 2015 KF172 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 25, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ 2015 KF172 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  9. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 25, 2019.