(523627) 2008 QB 43

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Asteroid
(523627) 2008 QB 43
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO (E SDO ) or
CKBO ( «Hot» ),
«Distant Object»
Major semi-axis 41.726  AU
eccentricity 0.094
Perihelion - aphelion 37.794 AU - 45.658 AU
Inclination of the orbit plane 26.3 °
Length of the ascending node 320.4 °
Argument of the periapsis 75.9 °
Time of passage of the perihelion March 11, 2036
Sidereal period 269 a 6.5 M
Mean orbital velocity 4.573 km / s
Physical Properties
Medium diameter approx. 315 km
Albedo 0.08-0.09
Absolute brightness 5.9 - 6.0 mag
history
Explorer Megan E. Schwamb,
Michael E. Brown
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.

(523627) 2008 QB 43 is a large trans-Neptunian object in the Kuiper belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbital dynamics. Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2008 QB 43 was on 25 August 2008 by Meg Schwamb and Mike Brown of the California Institute of Technology (CalTech) with the 1.5-meter Cassegrain telescope at Palomar Observatory ( California discovered). The discovery was announced on October 27th 2009, the asteroid was on 25 September 2018 the IAU , the Minor Planet -number five hundred twenty-three thousand six hundred and twenty-seven .

After its discovery, in 2008 QB 43 could be identified on photos taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ) going back to October 2, 2000 and so on extend its observation period by two years in order to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In October 2018, a total of 112 observations were made over a period of 18 years. The last observation so far was carried out in January 2018 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 26, 2019)

properties

Orbit

2008 QB 43 orbits the sun in 269.54 years on a slightly elliptical orbit between 37.79  AU and 45.66 AU from its center. The orbit eccentricity is 0.094, the orbit is inclined 26.33 ° to the ecliptic . Currently, the planetoid is 38.16 AU from the sun. He will next pass through perihelion in 2036, so the last perihelion should have occurred in 1766.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center does not have a specific classification; the latter classifies 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 315 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.9  m . Based on this diameter, the total surface area is around 312,000 km 2 . The apparent magnitude of 2008 QB 43 is 21.87  m .

Since it is conceivable that 2008 QB 43 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 QB 43 to perhaps is a dwarf planet.

Determinations of the diameter for 2008 QB 43
year Dimensions km source
2018 280.0 Johnston
2018 315.0 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 523627 . SwRI (Space Science Department). Retrieved March 26, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 26, 2019.
  3. ↑ a b c (523627) 2008 QB43 at the IAU Minor Planet Center (English) Retrieved on March 26, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2009-U114: 2008 QB43 . IAU . October 27, 2009. Retrieved March 26, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 26, 2019. Reference there: MPC 111778
  7. ↑ (523627) 2008 QB43 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 26, 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. Accessed March 26, 2019.
  9. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 26, 2019.
  10. ↑ (523627) 2008 QB43 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  11. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 26, 2019.