2015 AH 281

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Asteroid
2015 AH 281
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type CKBO ( «Hot» ) ?,
«Distant Object»
Major semi-axis 43,337  AU
eccentricity 0.196
Perihelion - aphelion 34.829 AU - 51.844 AU
Inclination of the orbit plane 8 °
Length of the ascending node 286.5 °
Argument of the periapsis 358.5 °
Time of passage of the perihelion March 19, 1873
Sidereal period 285 a 3.5 M.
Mean orbital velocity 4.487 km / s
Physical Properties
Medium diameter approx. 447 km
Albedo 0.06-0.09
Absolute brightness 5.1 - 5.5 mag
history
Explorer Pan-STARRS
Date of discovery January 13, 2015
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.

2015 AH 281 is a large trans-Neptunian object in the Kuiper belt , which may be classified as Cubewano (CKBO) in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2015 AH 281 was discovered on January 13, 2015 by a team of astronomers as part of the Pan STARRS project with the 1.8 m Ritchey Chretien telescope (PS1) at the Haleakalā Observatory ( Maui ).

The asteroid's observation sheet begins with the official discovery observation on January 13, 2015. In April 2017, there were only 22 observations over a period of seven days. The last observation so far was carried out on January 20, 2015 again at the Pan-STARRS telescope. (As of March 6, 2019)

properties

Orbit

2015 AH 281 orbits the sun in 285.29 years on a slightly elliptical orbit between 34.83  AU and 51.84 AU from its center. The orbit eccentricity is 0.196, the orbit is 7.99 ° inclined to the ecliptic . The planetoid is currently 51.82 AU from the sun. The last time he passed through perihelion in 1873, the next perihelion should therefore take place in 2158.

Neither Marc Buie ( DES ) nor the Minor Planet Center has 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 447 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.5  m . Assuming a diameter of 447 km, this results in a total surface of about 628,000 km 2 .

Since it can be assumed that 2015 AH 281 is in hydrostatic equilibrium due to its size and therefore has to be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that 2015 AH 281 may be a dwarf planet.

Provisions of the diameter for 2015 AH 281
year Dimensions km source
2018 423.0 Johnston
2018 447.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 6, 2019.
  2. ↑ a b c 2015 AH281 at the IAU Minor Planet Center (English) Retrieved March 6, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ 2015 AH281 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 6, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  5. ^ Marc W. Buie : Orbit Fit and Astrometric record for 15AH281 . SwRI (Space Science Department). Retrieved March 6, 2019.
  6. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 6, 2019.
  7. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 6, 2019.