(470596) 2008 NW 4

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Asteroid
(470596) 2008 NW 4
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO or
CKBO ( «Hot» ),
«Distant Object»
Major semi-axis 45.376  AU
eccentricity 0.194
Perihelion - aphelion 36,558 AU - 54,194 AU
Inclination of the orbit plane 23.1 °
Length of the ascending node 285 °
Argument of the periapsis 41.1 °
Time of passage of the perihelion 1st May 2019
Sidereal period 305 a 8.0 M
Mean orbital velocity 4.385 km / s
Physical Properties
Medium diameter approx. 343 km
Albedo 0.08-0.09
Absolute brightness 5.4 - 5.7 mag
history
Explorer Megan E. Schwamb
Michael E. Brown
David L. Rabinowitz
Date of discovery July 7, 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.

(470596) 2008 NW 4 is a large trans-Neptunian object in the Kuiper Belt , which is classified as a Scattered Disk Object (SDO) or as a Cubewano (CKBO) in terms of its orbit dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2008 NW 4 was discovered on July 7, 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 confirmed by the Cerro Tololo Observatory and announced on September 4, 2008 together with 2008 OG 19 , the planetoid was later given the minor planet number 470596 by the IAU .

The observation arc of the planetoid begins with the official observation on July 7th, 2008. Since then, the planetoid has been observed through various earth-based telescopes. In April 2017, a total of 87 observations were made over a period of 8 years. The last observation so far was carried out in July 2015 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 19, 2019)

properties

Orbit

2008 NW 4 orbits the sun in 305.67 years in an almost circular orbit between 36.55  AU and 54.19 AU from its center. The orbit eccentricity is 0.194, the orbit is 23.10 ° inclined to the ecliptic . The planetoid is currently 42.99 AU from the sun. He passed perihelion for the last time in 2019, so the next perihelion should take place in 2325.

Marc Buie ( DES ) classifies the planetoid as SDO , 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 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 . The apparent magnitude of 2008 NW 4 is 21.38  m .

Since it is conceivable that, due to its size, NW 4 will be in hydrostatic equilibrium in 2008 and thus largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2008 NW 4 to perhaps is a dwarf planet.

Determination of the diameter for 2008 NW 4
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 Marc W. Buie : Orbit Fit and Astrometric record for 470596 . SwRI (Space Science Department). Retrieved March 19, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 19, 2019.
  3. ↑ a b c (470596) 2008 NW4 at the IAU Minor Planet Center (English) Retrieved on March 19, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2008-R20: 2008 NW4, 2008 OG19 . IAU . September 4, 2008. Retrieved March 19, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 19, 2019.
  7. ↑ (470596) 2008 NW4 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. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 19, 2019.
  10. ↑ (470596) 2008 NW4 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 19, 2019.