(505679) 2014 WT 69

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Asteroid
(505679) 2014 WT 69
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 47,406  AU
eccentricity 0.074
Perihelion - aphelion 43.875 AU - 50.936 AU
Inclination of the orbit plane 12 °
Length of the ascending node 260.8 °
Argument of the periapsis 73.5 °
Time of passage of the perihelion November 19, 1955
Sidereal period 326 a 4.8 M
Mean orbital velocity 4.291 km / s
Physical Properties
Medium diameter approx. 302 km
Albedo 0.08-0.09
Absolute brightness 5.7 - 6.0 mag
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery 17th November 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.

(505679) 2014 WT 69 is a large trans-Neptunian object in the Kuiper belt , which is classified as a scattered disk object (SDO) in terms of rail dynamics . Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2014 WT 69 was discovered on November 17, 2014 by a team of astronomers , consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, in pictures taken as part of the Pan-STARRS project with the 1 , 8 m Ritchey Chretien Telescope (PS1) at Haleakalā Observatory ( Maui ) on October 8, 2010, discovered. The discovery was announced on July 24, 2016, the planetoid was later given the minor planet number 505679 by the IAU .

After its discovery, in 2010 FC 49 could be identified in the photos taken as part of the Pan-STARRS program going back to October 8, 2010, thus extending its observation period by four years in order to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In November 2017, there were a total of 37 observations over a period of 7 years. The last observation so far was made in August 2017 at the Mauna Kea Observatory ( Hawaii ). (As of April 1, 2019)

properties

Orbit

2014 WT 69 orbits the sun in 326.40 years on a slightly elliptical orbit between 43.87  AU and 50.94 AU from its center. The orbit eccentricity is 0.074, the orbit is 11.95 ° inclined to the ecliptic . The planetoid is currently 46.43 AU from the Sun. He last passed through perihelion in 1955, so the next perihelion should take place in 2282.

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 lists it as "other TNO" , which means that it is definitely not a Cubewano or Resonantes KBO .

size

A diameter of 302 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 6.0  m . Based on this diameter, the total surface area is around 287,000 km 2 . The apparent brightness of 2014 WT 69 is 22.68  m .

Since it is conceivable that 2014 WT 69 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 WT 69 to perhaps is a dwarf planet.

Determination of the diameter for 2014 WT 69
year Dimensions km source
2018 321.0 Johnston
2018 302.0 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 505679 . SwRI (Space Science Department). Retrieved April 1, 2019.
  2. ↑ a b c (505679) 2014 WT69 at the IAU Minor Planet Center (English) Accessed April 1, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC 2016-0291: 2014 WT69 . IAU . July 24, 2016. Retrieved April 1, 2019.
  5. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved April 1, 2019.
  6. ↑ (505679) 2014 WT69 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved April 1, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved April 1, 2019.
  8. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved April 1, 2019.
  9. ↑ (505679) 2014 WT69 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 April 1, 2019.