2008 WP 332

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Asteroid
2008 UA 332
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type CKBO ( "hot" ),
"Distant Object"
Major semi-axis 44.834  AU
eccentricity 0.015
Perihelion - aphelion 44,152 AU - 45,515 AU
Inclination of the orbit plane 32.1 °
Length of the ascending node 97.5 °
Argument of the periapsis 287.5 °
Time of passage of the perihelion October 31, 2008
Sidereal period 300 a 2.4 M
Mean orbital velocity 4.412 km / s
Physical Properties
Medium diameter approx. 373 km
Albedo 0.08-0.09
Absolute brightness 5.2 - 5.6 mag
history
Explorer Lawrence H. Wasserman
Date of discovery October 26, 2008
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.

2008 UA 332 is a large trans-Neptunian object in the Kuiper belt , which is classified as Cubewano (CKBO) in terms of railway dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2008 UA 332 was discovered on October 26, 2008 by Larry Wasserman with the 4.0 m Víctor M. Blanco telescope (DECam) at the Cerro Tololo Observatory ( Chile ).

The observation arc of the planetoid begins with the official observation on October 26, 2008. Since then, the planetoid has been observed by the Cerro Tololo and the Kitt Peak observatory . In April 2017, there were only 6 observations over a period of 54 days. The last observation so far was made in December 2008 at the Kitt Peak Observatory ( Arizona ). (As of March 14, 2019)

properties

Orbit

2008 UA 332 orbits the sun in 300.20 years in an almost circular orbit between 44.15  AU and 45.51 AU from its center. The orbit eccentricity is 0.015, the orbit is 32.11 ° inclined to the ecliptic . The planetoid is currently 44.17 AU from the Sun. He passed through perihelion for the last time in 2008, so the next perihelion should take place in 2309.

Neither Marc Buie ( DES ) nor the Minor Planet Center has a specific classification; the latter only lists 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 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6  m . Based on this diameter, the total surface area is around 437,000 km 2 .

Since it is conceivable that 2008 UA 332 will be 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 2008 UA 332 to perhaps is a dwarf planet.

Provisions of the diameter for 2008 UA 332
year Dimensions km source
2018 404.0 Johnston
2018 373.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 14, 2019.
  2. ↑ a b c 2008 UA332 at the IAU Minor Planet Center (English) Accessed March 14, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC List Of Transneptunian Objects . IAU . Retrieved March 14, 2019.
  5. ↑ 2008 UA332 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 14, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  6. ^ Marc W. Buie : Orbit Fit and Astrometric record for 08UA332 . SwRI (Space Science Department). Retrieved March 14, 2019.
  7. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 14, 2019.
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 14, 2019.
  9. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 14, 2019.