(535020) 2014 WG 509

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Asteroid
2014 WG 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 42.375  AU
eccentricity 0.085
Perihelion - aphelion 38.793 AU - 45.956 AU
Inclination of the orbit plane 21.4 °
Length of the ascending node 129.6 °
Argument of the periapsis 177.7 °
Time of passage of the perihelion April 9, 1934
Sidereal period 275 a 10.2 M
Mean orbital velocity 4.538 km / s
Physical Properties
Medium diameter approx. 329 km
Albedo 0.08-0.09
Absolute brightness 5.8 likes
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery November 21, 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 WG 509 , a celestial body , 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 is one of the dwarf planet candidates .

discovery

2014 WG 509 was discovered on November 21, 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 17, 2016.

After its discovery in 2014, WG 509 could be identified on photos, which were also taken as part of the Pan-STARRS program, going back to September 6, 2010 and thus extended its observation period by two 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, a total of 111 observations were made over a period of 8 years. The last observation so far was carried out again at the Pan-STARRS telescope in January 2018. (As of March 24, 2019)

properties

Orbit

2014 WG 509 orbits the sun in 275.85 years on a slightly elliptical orbit between 38.79  AU and 45.96 AU from its center. The eccentricity of the orbit is 0.085, the orbit is inclined at 21.42 ° to the ecliptic . The planetoid is currently 43.90 AU from the sun. He passed through perihelion for the last time in 1934, so the next perihelion should take place in 2210.

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 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 brightness of 2014 WG 509 is 22.38  m .

Since it is conceivable that 2014 WG 509 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 believes that it is in 2014 WG 509 to perhaps is a dwarf planet.

Provisions of the diameter for 2014 WG 509
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 14WG509 . SwRI (Space Science Department). Retrieved March 25, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 25, 2019.
  3. ↑ a b c (535020) 2014 WG509 at the IAU Minor Planet Center (English) Accessed March 25, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-O101: 2014 WG509 . IAU . July 17, 2016. Retrieved March 25, 2019.
  6. ↑ (535020) 2014 WG509 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 25, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 25, 2019.
  8. ↑ (535020) 2014 WG509 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.