(523653) 2011 OA 60

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Asteroid
(523653) 2011 OA 60
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 41.127  AU
eccentricity 0.147
Perihelion - aphelion 35,077 AU - 47,178 AU
Inclination of the orbit plane 23 °
Length of the ascending node 129.5 °
Argument of the periapsis 141.8 °
Time of passage of the perihelion October 9, 2001
Sidereal period 263 a 9.1 M.
Mean orbital velocity 4.606 km / s
Physical Properties
Medium diameter approx. 457 km
Albedo 0.06-0.09
Absolute brightness 5.1 - 5.4 mag
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery July 20, 2011
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.

(523653) 2011 OA 60 is a large trans-Neptunian object in the Kuiper Belt , which is classified as an extended Scattered Disc Object (DO) or as a Cubewano in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2011 OA 60 was discovered on July 20, 2011 by a team of astronomers consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman as part of the Pan-STARRS project with the 1.8 m Ritchey -Chretien Telescope (PS1) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 26, 2016 the asteroid was on 25 September 2018 the IAU , the minor planet number five hundred twenty-three thousand six hundred forty .

After its discovery, in 2011 OA 60 could be identified on photos up to May 9, 2010, which were also taken as part of the Pan-STARRS program, and thus its observation period was extended by six years in order to calculate its orbit more precisely. In October 2018, a total of 143 observations over a period of 9 years were available. The last observation so far was carried out again at the Pan-STARRS telescope in August 2018. (As of March 1, 2019)

properties

Orbit

2011 OA 60 orbits the sun in 263.76 years on a slightly elliptical orbit between 35.08  AU and 47.18 AU from its center. The orbit eccentricity is 0.147, the orbit is 23.02 ° inclined to the ecliptic . The planetoid is currently 35.78 AU from the sun. The last time he passed through perihelion was in 2001, the next perihelion should therefore take place in 2265.

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 457 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.4  m . Assuming a diameter of 457 km, this results in a total surface of around 656,000 km 2 . The apparent magnitude of 2011 OA 60 is 20.87  m .

Since it can be assumed that 2011 OA 60 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2011 OA 60 to possibly is a dwarf planet.

Provisions of the diameter for 2011 OA 60
year Dimensions km source
2018 423.0 Johnston
2018 457.0 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 523653 . SwRI (Space Science Department). Retrieved March 1, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Accessed March 1, 2019.
  3. ↑ a b c (523653) 2011 OA60 at the IAU Minor Planet Center (English) Retrieved March 1, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-0339: 2011 OA60 . IAU . July 26, 2016. Accessed March 1, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 1, 2019.
  7. ↑ (523653) 2011 OA60 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 1, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 1, 2019.
  9. ↑ (523653) 2011 OA60 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 1, 2019.