(305543) 2008 QY 40

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Asteroid
(305543) 2008 QY 40
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 62,019  AU
eccentricity 0.406
Perihelion - aphelion 36.817 AU - 87.222 AU
Inclination of the orbit plane 25.2 °
Length of the ascending node 43.2 °
Argument of the periapsis 331.5 °
Time of passage of the perihelion June 6, 2023
Sidereal period 488 a 5.2 M
Mean orbital velocity 3.751 km / s
Physical Properties
Medium diameter approx. 329 km
Albedo 0.08-0.10
Absolute brightness 5.19 ± 0.06 - 5.8 mag
Spectral class C.
history
Explorer Megan E. Schwamb
Michael E. Brown
David L. Rabinowitz
Date of discovery August 25, 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.

(305543) 2008 QY 40 is a large trans-Neptunian object in the Kuiper belt , which is classified as a scattered disk object (SDO) in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2008 QY 40 was discovered on August 25, 2008 by a team of astronomers consisting of Meg Schwamb, Mike Brown and David Lincoln Rabinowitz , using the 1.2 m Oschin Schmidt telescope at the Palomar Observatory of the California Institute of Technology ( California ) . The discovery was announced on January 3, 2009, the planetoid was later given the minor planet number 305543 by the IAU .

The observation arc of the planetoid begins with the official observation on August 25, 2008. Since then, the planetoid has been observed through various earth-based telescopes. In April 2017, there were a total of 88 observations over a period of 7 years. The last observation so far was carried out in July 2015 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 24, 2019)

properties

Orbit

2008 QY 40 orbits the sun in 488.43 years in a strongly elliptical orbit between 36.81  AU and 87.22 AU from its center. The orbit eccentricity is 0.406, the orbit is 25.18 ° inclined to the ecliptic . The planetoid is currently 36.92 AU from the sun. He will next pass perihelion in 2023, so the last perihelion should have occurred in 1535.

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 329 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.8  m . Based on this diameter, the total surface area is around 340,000 km 2 . The apparent magnitude of 2008 QY 40 is 21.26  m .

Since it is conceivable that 2008 QY 40 will be 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 2008 QY 40 to perhaps is a dwarf planet.

Determinations of the diameter for 2008 QY 40
year Dimensions km source
2013 383.27 LightCurve DataBase
2018 352.0 Johnston
2018 329.0 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 305543 . SwRI (Space Science Department). Retrieved March 24, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 24, 2019.
  3. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 24, 2019.
  4. ↑ a b c (305543) 2008 QY40 at the IAU Minor Planet Center (English). Accessed March 24, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ S. Benecchi, S. Sheppard : Light Curves of 32 Large Transneptunian Objects (PDF) . In: The Astronomical Journal . 145, No. 5, January 24, 2013, p. 124, 19. arxiv : 1301.5791 . bibcode : 2013AJ .... 145..124B . doi : 10.1088 / 0004-6256 / 145/5/124 .
  7. ↑ a b LCDB Data for (305543) . MinorPlanetInfo. 2013. Accessed March 24, 2019.
  8. ↑ MPC : MPEC 2009-A21: 2008 QY40 . IAU . January 3, 2009. Accessed March 24, 2019.
  9. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 24, 2019.
  10. ↑ (305543) 2008 QY40 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 24, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  11. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 24, 2019.
  12. ↑ (305543) 2008 QY40 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  13. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 24, 2019.