2001 QX 322

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Asteroid
2001 QX 322
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 58,159  AU
eccentricity 0.39
Perihelion - aphelion 35,473 AU - 80,844 AU
Inclination of the orbit plane 28.6 °
Length of the ascending node 254.7 °
Argument of the periapsis 65 °
Time of passage of the perihelion August 11, 1977
Sidereal period 443 a 6.5 M.
Mean orbital velocity 3.874 km / s
Physical Properties
Medium diameter approx. 344 km
Albedo 0.04-0.09
Absolute brightness 6.3 - 6.4 mag
Spectral class C
B-R = 1.460
history
Explorer Paul J. Groot
Date of discovery August 19, 2001
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.

2001 QX 322 is a large trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of its orbit dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2001 QX 322 was discovered on August 19, 2001 by Paul Groot with the 2.5 m Isaac Newton telescope at the Roque de los Muchachos observatory ( La Palma ). The discovery was announced on November 14, 2001 along with 2001 UR 163 and 2001 VN 71 ,

The observation arc of the planetoid begins with the official observation on August 19, 2001. Since then, the planetoid has been observed through various earth-based telescopes. In December 2018, there were a total of 86 observations over a period of 17 years. The last observation so far was carried out in October 2017 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 19, 2019)

properties

Orbit

2001 QX 322 orbits the sun in 443.54 years in a strongly elliptical orbit between 35.47  AU and 80.84 AU from its center. The orbital eccentricity is 0.390, the orbit is 28.59 ° inclined to the ecliptic . The planetoid is currently 43.93 AU from the sun. The last time he passed through perihelion was in 1977, the next perihelion should therefore take place in 2421.

Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as SDO ; the latter also generally lists it as a “distant object” .

size

A diameter of 344 km is currently assumed, based on a reflectivity of 4% and an absolute brightness of 6.4  m . Based on this diameter, the total area is about 372,000 km². The apparent magnitude of 2001 QX 322 is 22.44  m .

Since it is conceivable that 2001 QX 322 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 2001 QX 322 to perhaps is a dwarf planet.

2001 QX 322 seems to have a bluish (neutral) color, which is why the albedo is assumed to be comparatively low.

Determination of the diameter for 2001 QX 322
year Dimensions km source
2018 267.0 Johnston
2018 344.0 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 01QX322 . SwRI (Space Science Department). Retrieved March 19, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 19, 2019.
  3. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 19, 2019.
  4. ↑ a b c 2001 QX322 at the IAU Minor Planet Center (English) Accessed March 19, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ MPC : MPEC 2001-V57: 2001 QX322, 2001 UR163, 2001 VN71 . IAU . November 14, 2001. Retrieved March 19, 2019.
  7. ↑ 2001 QX322 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 19, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 19, 2019.
  9. ↑ 2001 QX322 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b c Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 19, 2019.