(523629) 2008 SP 266

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Asteroid
(523629) 2008 SP 266
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 40.923  AU
eccentricity 0.119
Perihelion - aphelion 36.051 AU - 45.796 AU
Inclination of the orbit plane 19.5 °
Length of the ascending node 141.1 °
Argument of the periapsis 236.2 °
Time of passage of the perihelion April 28, 2016
Sidereal period 261 a 9.6 M
Mean orbital velocity 4.618 km / s
Physical Properties
Medium diameter approx. 302 km
Albedo 0.08-0.09
Absolute brightness 5.9 - 6.0 mag
history
Explorer Megan E. Schwamb
Michael E. Brown
David L. Rabinowitz
Date of discovery September 26, 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.

(523629) 2008 SP 266 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 SP 266 was discovered on September 26, 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 made on 18 December 2008 together with the Plutino 2008 SO 266 announced the asteroid was on 25 September 2018 the IAU , the Minor Planet -number five hundred twenty-three thousand six hundred twenty-nine .

After its discovery, in 2008 SP 266 could be identified on photos taken as part of the Sloan Digital Sky Survey (SDSS) program at the Apache Point Observatory ( New Mexico ) going back to September 17, 2006 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 there were a total of 169 observations over a period of 12 years. The last observation so far was carried out in November 2017 at the Pan-STARRS telescope (PS1) ( Maui ). (As of April 2, 2019)

properties

Orbit

2008 SP 266 orbits the sun in 261.80 years on a slightly elliptical orbit between 36.05  AU and 45.80 AU from its center. The orbit eccentricity is 0.119, the orbit is 19.49 ° inclined to the ecliptic . The planetoid is currently 36.07 AU from the Sun. He last passed through perihelion in 2016, so the next perihelion should take place in 2278.

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 302 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 6.0  m . Based on this diameter, the total surface area is around 287,000 km 2 . The apparent magnitude of 2008 SP 266 is 21.66  m .

Since it is conceivable that 2008 SP 266 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2008 SP 266 to perhaps is a dwarf planet.

Provisions of the diameter for 2008 SP 266
year Dimensions km source
2018 293.0 Johnston
2018 302.0 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 523629 . SwRI (Space Science Department). Retrieved April 2, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved April 2, 2019.
  3. ↑ a b c (523629) 2008 SP266 at the IAU Minor Planet Center (English). Accessed April 2, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2008-Y07: 2008 SO266, 2008 SP266 . IAU . December 18, 2008. Retrieved April 2, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved April 2, 2019. Reference there: MPC 111778
  7. ↑ (523629) 2008 SP266 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved April 2, 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 April 2, 2019.
  9. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved April 2, 2019.
  10. ↑ (523629) 2008 SP266 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 April 2, 2019.