2014 UN 225

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Asteroid
2014 UN 225
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 59.914  AU
eccentricity 0.357
Perihelion - aphelion 38.529 AU - 81.298 AU
Inclination of the orbit plane 53.1 °
Length of the ascending node 68.5 °
Argument of the periapsis 323.4 °
Time of passage of the perihelion August 26, 2061
Sidereal period 463 a 9.2 m
Mean orbital velocity 3.816 km / s
Physical Properties
Medium diameter approx. 343 km
Albedo 0.08-0.09
Absolute brightness 5.4 - 5.7 mag
history
Explorer A. Elliott
Kathleen Grabowski
Harold Spinka
Keith Bechtol
L. Buckley-Geer
David James
Brian Nord
Simon Birrer
N. Sevilla Noarbe
C. Wethers
Chris B. D'Andrea
D. Gangkofner
T. Li
Devon L. Hollowood
Date of discovery October 22, 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 UN 225 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 may be one of the dwarf planet candidates .

discovery

2014 UN 225 was discovered on October 22, 2014 by a team of astronomers consisting of A. Elliott, Kathleen Grabowski, Harold Spinka, Keith Bechtol, L. Buckley-Geer, David James, Brian Nord, Simon Birrer, N. Sevilla Noarbe, C. Wethers, Chris D'Andrea, D. Gangkofner, T. Li and Devon Hollowood, as part of the Dark Energy Survey project with the 4.0 m Víctor M. Blanco telescope (DECam) at the Cerro Tololo Observatory ( Chile ) discovered. The discovery was announced on July 1, 2017.

The observation arc of the planetoid begins with the official discovery observation on October 22, 2014. So far, the planetoid has only been observed by the Cerro Tololo observatory. In June 2017, a total of 13 observations were made over a period of 2 years. The last observation so far was carried out in September 2016 at the Cerro Tololo Observatory. (As of March 22, 2019)

properties

Orbit

2014 UN 225 orbits the sun in 463.77 years in an elliptical orbit between 38.53  AU and 81.30 AU from its center. The orbital eccentricity is 0.357, the orbit is inclined 53.11 ° to the ecliptic . Currently, the planetoid is 45.66 AU from the sun. He will next pass through perihelion in 2061, so the last perihelion should have occurred in 1597.

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 343 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.7  m . Based on this diameter, the total surface area is around 370,000 km 2 . The apparent magnitude of 2014 UN 225 is 22.21  m .

Since it is conceivable that 2014 UN 225 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2,014 UN 225 to perhaps is a dwarf planet.

Provisions of the diameter for 2014 UN 225
year Dimensions km source
2018 368.0 Johnston
2018 343.0 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 14UN225 . SwRI (Space Science Department). Retrieved March 22, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 22, 2019.
  3. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 22, 2019.
  4. ↑ a b c 2014 UN225 at the IAU Minor Planet Center (English) Retrieved on March 22, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ MPC : MPEC 2017-N01: 2014 UN225 . IAU . July 1, 2017. Accessed March 22, 2019.
  7. ↑ 2014 UN225 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 22, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ 2014 UN225 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 22, 2019.