(307616) 2003 QW 90

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Asteroid
(307616) 2003 QW 90
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type CKBO ( "Hot" )
"Distant Object"
Major semi-axis 43.695  AU
eccentricity 0.252
Perihelion - aphelion 32.691 AU - 54.7 AU
Inclination of the orbit plane 11.8 °
Length of the ascending node 341.8 °
Argument of the periapsis 175.6 °
Time of passage of the perihelion December 26, 2082
Sidereal period 288 a 10.1 M
Mean orbital velocity 4.469 km / s
Physical Properties
Medium diameter approx. 457 km
Albedo 0.06-0.09
Absolute brightness 5.0 - 5.4 mag
history
Explorer Marc W. Buie
Date of discovery August 23, 2003
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.

(307616) 2003 QW 90 is a large trans-Neptunian object in the Kuiper belt , which is classified as Cubewano in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2003 QW 90 was discovered on August 23, 2003 by Marc William Buie at the Cerro Tololo Observatory ( Chile ). The discovery was announced on October 5, 2003, the planetoid was later given the minor planet number 307616 by the IAU .

After its discovery, in 2003 QW 90 could be identified on photos taken as part of the Near Earth Asteroid Tracking Program at the Palomar Observatory up to September 11, 2002, and so its observation period was extended by one year calculate its orbit more precisely. In September 2017, there were a total of 208 observations over a period of 15 years. The last observation so far was carried out in September 2017 on the Pan-STARRS telescope (PS1). (As of March 1, 2019)

properties

Orbit

2003 QW 90 orbits the sun in 288.84 years on a slightly elliptical orbit between 40.48  AU and 46.91 AU from its center. The orbit eccentricity is 0.073, the orbit is 10.37 ° inclined to the ecliptic . The planetoid is currently 40.20 AU from the sun. He will next pass through perihelion in 2082, so the last perihelion should have occurred in 1794.

Both Marc Buie ( DES ) and the Minor Planet Center classify the asteroids as Cubewano , where he ground dynamically to the "hot" classical KBO heard; the latter also lists it as a non-SDO and generally as a “distant object” .

size

A diameter of 457 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.4  m . Assuming a diameter of 457 km, this results in a total surface of around 656,000 km 2 . The apparent brightness of 2003 QW 90 is 21.70  m , the mean surface temperature is estimated at 42 K (−231 ° C) based on the distance from the sun  .

Since it can be assumed that 2003 QW 90 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 believes that it is in 2003 QW 90 to possibly is a dwarf planet.

Determination of the diameter for 2003 QW 90
year Dimensions km source
2018 443.0 Johnston
2018 457.0 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 307616 . SwRI (Space Science Department). Retrieved March 1, 2019.
  2. ↑ a b MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 1, 2019.
  3. ↑ a b c (307616) 2003 QW90 at the IAU Minor Planet Center (English) Accessed March 1, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2003-T23: 2003 QW90 . IAU . October 5, 2003. Retrieved March 1, 2019.
  6. ↑ (307616) 2003 QW90 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 1, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 1, 2019.
  8. ↑ (307616) 2003 QW90 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  9. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 1, 2019.
  10. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 1, 2019.