(523750) 2014 US 224

from Wikipedia, the free encyclopedia
Asteroid
(523750) 2014 US 224
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type CKBO ( "Hot" ),
"Distant Object"
Major semi-axis 46.534  AU
eccentricity 0.114
Perihelion - aphelion 41.242 AU - 51.826 AU
Inclination of the orbit plane 11 °
Length of the ascending node 318 °
Argument of the periapsis 179.1 °
Time of passage of the perihelion March 12, 2088
Sidereal period 317 a 5.3 M
Mean orbital velocity 4,331 km / s
Physical Properties
Medium diameter approx. 468 km
Albedo 0.07-0.09
Absolute brightness 5.0 - 5.3 mag
history
Explorer Pan-STARRS
Date of discovery October 28, 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.

(523750) 2014 US 224 is a large trans-Neptunian object in the Kuiper Belt , which is classified as Cubewano in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2014 US 224 was discovered on October 28, 2014 by a team of astronomers as part of the Pan-STARRS project with the 1.8 m Ritchey Chretien telescope (PS1) at the Haleakalā Observatory ( Maui ). The discovery was announced on 31 October 2016 the asteroid was on 25 September 2018 the IAU , the minor planet number 523 752 .

After its discovery in 2014, US 224 could be identified on photos up to October 14, 2010, which were also taken as part of the Pan-STARRS program, and thus its observation period was extended by four years in order to calculate its orbit more precisely. In October 2018, a total of 88 observations were made over a period of 8 years. The last observation to date was also carried out on the Pan-STARRS telescope in November 2017. (As of February 26, 2019)

properties

Orbit

2014 US 224 orbits the sun in 317.44 years on a slightly elliptical orbit between 41.24  AU and 51.83 AU from its center. The orbit eccentricity is 0.114, the orbit is 11.04 ° inclined to the ecliptic . The planetoid is currently 46.05 AU from the Sun. He will next pass through perihelion in 2088, so the last perihelion should have occurred in 1770.

Marc Buie ( DES ) classifies the planetoid as a Cubewano , whereby it belongs to the orbital dynamics “hot” classical KBO , while the Minor Planet Center classifies it as a non-SDO and generally as a “distant object” .

size

A diameter of around 468 km is currently assumed, based on a reflectivity of 7% and an absolute brightness of 5.3  m . Assuming a diameter of 468 km, this results in a total surface of around 688,000 km 2 . The apparent magnitude of 2014 US 224 is 21.84  m .

Since it can be assumed that 2014 US 224 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2014 US 224 to possibly is a dwarf planet.

Provisions of the diameter for 2014 US 224
year Dimensions km source
2018 443.0 Johnston
2018 468.0 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 523750 . SwRI (Space Science Department). Retrieved February 26, 2019.
  2. ↑ a b c (523750) 2014 US224 at the IAU Minor Planet Center (English). Accessed February 26, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC 2016-U119: 2014 US224 . IAU . October 31, 2016. Retrieved February 26, 2019.
  5. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved February 26, 2019.
  6. ↑ (523750) 2014 US224 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 26, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 26, 2019.
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 26, 2019.
  9. ↑ (523750) 2014 US224 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved February 26, 2019.