2014 WW ₅₀₉

Asteroid 2014 WW 509
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	DO (E SDO ) or CKBO ( «Hot» ), «Distant Object»
Major semi-axis	42.449  AU
eccentricity	0.137
Perihelion - aphelion	36.653 AU - 48.245 AU
Inclination of the orbit plane	20.4 °
Length of the ascending node	110.3 °
Argument of the periapsis	171.5 °
Time of passage of the perihelion	November 10, 1900
Sidereal period	276 a 6.8 M
Mean orbital velocity	4.534 km / s
Physical Properties
Medium diameter	approx. 373 km
Albedo	0.08-0.09
Absolute brightness	5.3 - 5.6 mag
history
Explorer	Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman
Date of discovery	November 26, 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 WW ₅₀₉ is a large trans-Neptunian object in the Kuiper belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbital dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2014 WW ₅₀₉ was discovered on November 26, 2014 by an astronomical team 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 17, 2016.

After its discovery, WW _{509 could be identified} on photos up to November 11, 2010, which were also taken as part of the Pan-STARRS program, and so its observation period was extended 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 December 2018, there were a total of 66 observations over a period of 7 years. The last observation so far was carried out again in March 2017 on the Pan-STARRS telescope (PS1). (As of March 15, 2019)

properties

Orbit

2014 WW ₅₀₉ orbits the sun in 276.57 years on a slightly elliptical orbit between 36.65  AU and 48.25 AU from its center. The orbit eccentricity is 0.137, the orbit is inclined 20.44 ° to the ecliptic . The planetoid is currently 47.78 AU from the sun. The last time he passed through perihelion in 1900, the next perihelion should therefore take place in 2177.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), 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 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6  ^m . Based on this diameter, the total surface area is around 437,000 km ² . The apparent magnitude of 2014 WW ₅₀₉ is 22.35  ^m .

Since it is conceivable that 2014 WW ₅₀₉ 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 2014 WW ₅₀₉ to perhaps is a dwarf planet.

Provisions of the diameter for 2014 WW ₅₀₉

year	Dimensions km	source
2018	404.0	Johnston
2018	373.0	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 14WW509 . SwRI (Space Science Department). Retrieved March 15, 2019.
2. ↑ ^{a b c} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 15, 2019.
3. ↑ ^{a b c} 2014 WW509 at the IAU Minor Planet Center (English). Accessed March 15, 2019.
4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
5. ↑ MPC : MPEC 2016-0166: 2014 WW509 . IAU . July 17, 2016. Retrieved March 15, 2019.
6. ↑ 2014 WW509 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 15, 2019.
7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 15, 2019.
8. ↑ 2014 WW509 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 15, 2019.