(543354) 2014 AN 55

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Asteroid
2014 AN 55
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO or
"Distant Object"
Major semi-axis 56.16  AU
eccentricity 0.389
Perihelion - aphelion 34,304 AU - 78,015 AU
Inclination of the orbit plane 9.4 °
Length of the ascending node 283.9 °
Argument of the periapsis 307.3 °
Time of passage of the perihelion February 1, 2070
Sidereal period 420 a 10.4 M
Physical Properties
Medium diameter approx. 561 km
Albedo 0.09
Absolute brightness 4.1 - 4.6 mag
history
Explorer Pan-STARRS
Date of discovery 5th January 2014
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.

2014 AN 55 is a large trans-Neptunian object , which is classified as an SDO or more generally as a “distant object” in terms of railway dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2014 AN 55 was discovered by a team of astronomers with the 1.8 m Pan-STARRS telescope (PS1) at Haleakalā Observatory ( Maui ) on images taken on January 5, 2014. The discovery was announced on July 17, 2016.

After its discovery, AN 55 could be traced back to 2014 on photos taken at the Apache Point Observatory ( SDSS ) on March 12, 2005, and so its observation period was extended by nine years in order to calculate its orbit more precisely. In July 2018, a total of 133 observations were made over a period of 11 years. The last observation so far was carried out in June 2015 as part of the Pan-STARRS program.

properties

Orbit

2014 AN 55 orbits the sun in 420.87 years in a strongly elliptical orbit between 34.30  AU and 78.01 AU from its center. The orbit eccentricity is 0.389, the orbit is 9.43 ° inclined to the ecliptic . The planetoid is currently 46.44 AU from the Sun and 45.48 AU from Earth . He will next pass perihelion in 2070, so the last perihelion should have occurred in 1649. (As of February 1, 2019)

Marc Buie ( DES ) classifies it as an SDO ; the Minor Planet Center also manages it as an SDO and as a "Distant Object" .

size

A diameter of around 561 km is currently assumed, based on a reflectivity of 9% and an absolute brightness of 4.6  m . The apparent magnitude of 2014 AN 55 is 21.05  m .

Since it can be assumed that 2014 AN 55 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 2014 AN 55 is likely a dwarf planet.

Provisions of the diameter for 2014 AN 55
year Dimensions km source
2018 671.0 Johnston
2018 561.0 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 14AN55 . SwRI (Space Science Department). Retrieved February 2, 2019.
  2. ↑ a b MPC : List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 2, 2019.
  3. ↑ a b c (543354) 2014 AN55 at the IAU Minor Planet Center (English)
  4. ↑ MPC : MPEC 2016-O192: 2014 AN55 . IAU . July 17, 2016. Retrieved February 2, 2019.
  5. ↑ (543354) 2014 AN55 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 2, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  6. ↑ (543354) 2014 AN55 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  7. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved February 2, 2019.
  8. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 1, 2019.