(523758) 2014 WJ 509

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Asteroid
(523758) 2014 WJ 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 42.859  AU
eccentricity 0.142
Perihelion - aphelion 36.773 AU - 48.944 AU
Inclination of the orbit plane 21 °
Length of the ascending node 100.4 °
Argument of the periapsis 95.8 °
Time of passage of the perihelion May 30, 2059
Sidereal period 280 a 7.1 M
Mean orbital velocity 4.512 km / s
Physical Properties
Medium diameter approx. 343 km
Albedo 0.08-0.09
Absolute brightness 5.6 - 5.7 mag
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.

(523758) 2014 WJ 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 WJ 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, in images taken as part of the Pan-STARRS project with the 1 , 8 m Ritchey Chretien telescope (PS1) at Haleakalā Observatory ( Maui ) on May 6, 2010, discovered. The discovery was announced on July 17, 2016 the asteroid was on 25 September 2018 the IAU , the Minor Planet -number 523674 .

After its discovery, WJ 509 could be identified on photos up to May 6, 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. So far, the planetoid has only been observed through the Pan-STARRS telescope. In October 2018, a total of 151 observations were made over a period of 8 years. The last observation so far was carried out again on the Pan-STARRS telescope in February 2018. (As of March 20, 2019)

properties

Orbit

2014 WJ 509 orbits the sun in 280.59 years on a slightly elliptical orbit between 36.77  AU and 48.94 AU from its center. The orbit eccentricity is 0.142, the orbit is inclined 20.97 ° to the ecliptic . The planetoid is currently 39.67 AU from the Sun. He will next pass perihelion in 2059, so the last perihelion should have occurred in 1778.

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 343 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.7  m . Based on this diameter, the total surface area is around 370,000 km 2 . The apparent magnitude of 2014 WJ 509 is 21.82  m .

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

Determination of the diameter for 2014 WJ 509
year Dimensions km source
2018 336.0 Johnston
2018 343.0 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 523758 . SwRI (Space Science Department). Retrieved March 20, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 20, 2019.
  3. ↑ a b c (523758) 2014 WJ509 at the IAU Minor Planet Center (English) Retrieved March 20, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-O103: 2014 WJ509 . IAU . July 17, 2016. Retrieved March 20, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 20, 2019. Reference there: MPC 111779
  7. ↑ (523758) 2014 WJ509 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 20, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 20, 2019.
  9. ↑ (523758) 2014 WJ509 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 March 20, 2019.