(523702) 2014 HW 199

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Asteroid
(523702) 2014 HW 199
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 46.638  AU
eccentricity 0.184
Perihelion - aphelion 38.08 AU - 55.196 AU
Inclination of the orbit plane 15.4 °
Length of the ascending node 222.7 °
Argument of the periapsis 341.4 °
Time of passage of the perihelion 5th November 1994
Sidereal period 318 a 6.1 M
Mean orbital velocity 4.326 km / s
Physical Properties
Medium diameter approx. 302 km
Albedo 0.08-0.09
Absolute brightness 6.0 likes
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery April 30, 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.

(523702) 2014 HW 199 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 railway dynamics. Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2014 HW 199 was discovered on April 30, 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 1st , 8-m Ritchey Chretien Telescope (PS1) at Haleakalā Observatory ( Maui ) on January 30, 2011, discovered. The discovery was announced on July 17, 2016 the asteroid was on 25 September 2018 the IAU , the Minor Planet -number 523 702 .

After its discovery, HW 199 in 2014 could be identified on photos, which were also taken as part of the Pan-STARRS program, going back to May 18, 2010, thus extending its observation period by four years in order to calculate its orbit more precisely. Since then, the planetoid has only been observed through the Pan-STARRS telescope. In October 2018, a total of 118 observations were made over a period of 9 years. The last observation so far was carried out again at the Pan-STARRS telescope in May 2018. (As of April 3, 2019)

properties

Orbit

2014 HW 199 orbits the sun in 318.51 years on a slightly elliptical orbit between 38.08  AU and 55.20 AU from its center. The orbit eccentricity is 0.184, the orbit is inclined 15.45 ° to the ecliptic . The planetoid is currently 39.50 AU from the sun. The last time he went through perihelion was in 1994, so the next perihelion should take place in 2313.

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 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 HW 199 is 22.16  m .

Since it is conceivable that 2014 HW 199 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 HW 199 to perhaps is a dwarf planet.

Determination of the diameter for 2014 HW 199
year Dimensions km source
2018 280.0 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 523702 . SwRI (Space Science Department). Retrieved April 3, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved April 3, 2019.
  3. ↑ a b c (523702) 2014 HW199 at the IAU Minor Planet Center (English) Retrieved on April 3, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-O82: 2014 HW199 . IAU . July 17, 2016. Retrieved April 3, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved April 3, 2019. Reference there: MPC 111779
  7. ↑ (523702) 2014 HW199 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved April 3, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved April 3, 2019.
  9. ↑ (523702) 2014 HW199 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 3, 2019.