2014 UO ₂₂₄

Asteroid 2014 UO 224
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	SDO or CKBO ( «Hot» ), «Distant Object»
Major semi-axis	41,921  AU
eccentricity	0.106
Perihelion - aphelion	37,483 AU - 46,359 AU
Inclination of the orbit plane	7.3 °
Length of the ascending node	253.3 °
Argument of the periapsis	226.4 °
Time of passage of the perihelion	June 5, 2040
Sidereal period	271 a 5.2 M
Mean orbital velocity	4.563 km / s
Physical Properties
Medium diameter	approx. 315 km
Albedo	0.08-0.09
Absolute brightness	5.7 - 5.9 mag
history
Explorer	Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman
Date of discovery	October 25, 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 UO ₂₂₄ is a large trans-Neptunian object in the Kuiper Belt , which is classified as a Scattered Disk Object (SDO) or a Cubewano (CKBO) in terms of its orbit dynamics. Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2014 UO ₂₂₄ was discovered on October 25, 2014 by a team of astronomers consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, as part of the Pan-STARRS project with the 1.8 m -Ritchey Chretien Telescope (PS1) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 16, 2016.

After its discovery in 2014, UO _{224 could be identified} on photos, which were also taken as part of the Pan-STARRS program, going back to September 24, 2010, thus extending its observation period by four years in order to calculate its orbit more precisely. So far, the planetoid has only been observed through the Pan-STARRS telescope. In September 2018, a total of 90 observations were made over a period of 6 years. The last observation so far was carried out again at the Pan-STARRS telescope in January 2016. (As of March 27, 2019)

properties

Orbit

2014 UO ₂₂₄ orbits the sun in 271.43 years on a slightly elliptical orbit between 37.48  AU and 46.36 AU from its center. The orbit eccentricity is 0.106, the orbit is 7.35 ° inclined to the ecliptic . Currently, the planetoid is 38.12 AU from the sun. He will next pass through perihelion in 2040, so the last perihelion should have occurred in 1769.

Marc Buie ( DES ) classifies the planetoid as SDO , while the Minor Planet Center does not have a specific classification; the latter classifies it as a non-SDO and generally as a “distant object” . The Johnston's Archive, however, lists him as Cubewano , whereby he would belong to the "hot" classic KBO in terms of rail dynamics .

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 surface area is around 312,000 km ² . The apparent magnitude of 2014 UO ₂₂₄ is 21.83  ^m .

Since it is conceivable that 2014 UO ₂₂₄ 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 2014 UO ₂₂₄ to perhaps is a dwarf planet.

Provisions of the diameter for 2014 UO ₂₂₄

year	Dimensions km	source
2018	321.0	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

1. ^ ^{A b} Marc W. Buie : Orbit Fit and Astrometric record for 14UO224 . SwRI (Space Science Department). Retrieved March 27, 2019.
2. ↑ ^{a b c} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 27, 2019.
3. ↑ ^{a b c} 2014 UO224 at the IAU Minor Planet Center (English). Accessed March 27, 2019.
4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
5. ↑ MPC : MPEC 2016-O60: 2014 UO224 . IAU . July 16, 2016. Accessed March 27, 2019.
6. ↑ 2014 UO224 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 27, 2019.
7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 27, 2019.
8. ↑ 2014 UO224 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 27, 2019.