2001 QS 297

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Asteroid
2001 QS 297
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type "Other TNO" ,
"Distant Object"
Major semi-axis 43,794  AU
eccentricity 0
Perihelion - aphelion 43.79 AU - 43.797 AU
Inclination of the orbit plane 5.2 °
Length of the ascending node 309.8 °
Argument of the periapsis 208.5 °
Time of passage of the perihelion July 5, 1868
Sidereal period 289 a 9.8 M
Mean orbital velocity 4.464 km / s
Physical Properties
Medium diameter approx. 343 km
Albedo 0.08-0.09
Absolute brightness 5.4 - 5.7 mag
history
Explorer Robert L. Millis
Marc W. Buie
Lawrence H. Wasserman
Date of discovery August 20, 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 QS 297 is a large trans-Neptunian object in the Kuiper Belt , whose orbit classification is unclear. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2001 QS 297 was discovered on August 20, 2001 by a team of astronomers consisting of Robert Millis, Marc Buie and Larry Wasserman with the 4.0 m Víctor M. Blanco telescope (DECam) at the Cerro Tololo Observatory ( Chile ). The discovery was announced on October 12, 2001 along with 2001 QO 297 , 2001 QP 297 , 2001 QQ 297 , 2001 QR 297 and Teharonhiawako .

The observation arc of the planetoid begins with the official discovery observation on August 20, 2001. Since then, the planetoid has been observed through various earth-based telescopes. In April 2018, there were only 6 observations over a period of 23 days. The last observation so far was made in September 2001 at the Kitt Peak Observatory ( Arizona ). (As of March 20, 2019)

properties

Orbit

2001 QS 297 orbits the sun in 289.82 years on an almost perfectly circular orbit between 43.79  AU and 43.80 AU from its center. The orbit eccentricity is less than 0.001, the orbit is 5.23 ° inclined to the ecliptic . The planetoid is currently 43.80 AU from the sun. He passed through perihelion for the last time in 1868, so the next perihelion is likely to take place in 2158.

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 lists it as "other TNO" , which means it is definitely not a Cubewano or Resonantes KBO .

size

A diameter of 343 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.7  m . Based on this diameter, the total surface area is around 370,000 km 2 .

Since it is conceivable that 2001 QS 297 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 QS 297 to perhaps is a dwarf planet.

Determination of the diameter for 2001 QS 297
year Dimensions km source
2018 368.0 Johnston
2018 343.0 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 20, 2019.
  2. ↑ a b c 2001 QS297 at the IAU Minor Planet Center (English) Retrieved March 20, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC 2001-T38: 2001 QO297, 2001 QP297, 2001 QQ297, 2001 QR297, 2001 QS297, 2001 QT297 . IAU . October 12, 2001. Retrieved March 20, 2019.
  5. ↑ 2001 QS297 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 20, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  6. ^ Marc W. Buie : Orbit Fit and Astrometric record for 01QS297 . SwRI (Space Science Department). Retrieved March 20, 2019.
  7. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 20, 2019.
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 20, 2019.
  9. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 20, 2019.