(523757) 2014 WH 509

from Wikipedia, the free encyclopedia
Asteroid
(523757) 2014 WH 509
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO (E SDO ) or
SDO or
CKBO ( «Hot» ),
«Distant Object»
Major semi-axis 43,951  AU
eccentricity 0.176
Perihelion - aphelion 36,198 AU - 51,704 AU
Inclination of the orbit plane 18.2 °
Length of the ascending node 320.6 °
Argument of the periapsis 69.8 °
Time of passage of the perihelion October 18, 1962
Sidereal period 291 a 4.6 M
Mean orbital velocity 4.456 km / s
Physical Properties
Medium diameter approx. 468 km
Albedo 0.07-0.09
Absolute brightness 5.2 - 5.3 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.

(523757) 2014 WH 509 is a large trans-Neptunian object in the Kuiper belt , which is classified dynamically as a near or extended scattered disc object (DO or SDO) or as a Cubewano . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2014 WH 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 the asteroid was on 25 September 2018 the IAU , the minor planet number 523,757 .

After its discovery, in 2014 WH 509 could be identified on photos taken as part of the Near Earth Asteroid Tracking Program at the Palomar Observatory up to December 19, 2001, thus extending its observation period by 13 years calculate its orbit more precisely. In October 2018, a total of 178 observations were made over a period of 17 years. The last observation so far was again carried out in February 2018 at the Pan-STARRS telescope. (As of February 26, 2019)

properties

Orbit

2014 WH 509 orbits the sun in 291.38 years on a slightly elliptical orbit between 36.20  AU and 51.70 AU from its center. The orbital eccentricity is 0.176, the orbit is 18.19 ° inclined to the ecliptic . The planetoid is currently 46.05 AU from the Sun. The last time he passed through perihelion was in 1962, so the next perihelion should take place in 2254.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ) or SDO, while the Minor Planet Center 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 around 468 km is currently assumed, based on a reflectivity of 7% and an absolute brightness of 5.3  m . Assuming a diameter of 468 km, this results in a total surface of around 688,000 km 2 . The apparent magnitude of 2014 WH 509 is 21.61  m .

Since it can be assumed that 2014 WH 509 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2014 WH 509 to possibly is a dwarf planet.

Provisions of the diameter for 2014 WH 509
year Dimensions km source
2018 404.0 Johnston
2018 468.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b c Marc W. Buie : Orbit Fit and Astrometric record for 523757 . SwRI (Space Science Department). Retrieved February 26, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 26, 2019.
  3. ↑ a b c (523757) 2014 WH509 at the IAU Minor Planet Center (English) Retrieved on February 26, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-O102: 2014 WH509 . IAU . July 17, 2016. Retrieved February 26, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved February 26, 2019.
  7. ↑ (523757) 2014 WH509 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 26, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 26, 2019.
  9. ↑ (523757) 2014 WH509 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 February 26, 2019.