Astronomy:2014 AN55

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2014 AN55
Discovery [1]
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date5 January 2014
(first observed only)
Designations
2014 AN55
Minor planet categoryTNO [2] · SDO [3]
distant [1] · p-DP [4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 3
Observation arc10.24 yr (3,741 days)
Earliest precovery date12 March 2005
|{{{apsis}}}|helion}}78.400 AU
|{{{apsis}}}|helion}}34.389 AU
56.395 AU
Eccentricity0.3902
Orbital period423.51 yr (154,688 d)
Mean anomaly316.10°
Mean motion0° 0m 8.28s / day
Inclination9.4261°
Longitude of ascending node283.88°
306.82°
Physical characteristics
Dimensions561 km (estimated)[4]
671 km (estimated)[3]
367–821 km (for H=4.3 and 0.25~0.05 albedo)[5]
Geometric albedo0.09 (assumed)[3][4]
Absolute magnitude (H)4.1[2][1] · 4.3[6] · 4.6[4]


2014 AN55 is a trans-Neptunian object and a dwarf-planet candidate from the scattered disc, located in the outermost region of the Solar System, approximately 600 kilometres (370 mi) in diameter. It was first observed on 5 January 2014, by astronomers of the Pan-STARRS survey at Haleakala Observatory on the island of Maui, Hawaii, in the United States.[1]

Orbit and classification

2014 AN55 belongs to the gravitationally perturbed population of scattered disc objects,[3] which, at their closest approaches, come close to Neptune's orbit at 30 AU, but their farthest distances reach many times of that.

It orbits the Sun at a distance of 34.4–78.4 AU once every 423 years and 6 months (154,688 days; semi-major axis of 56.4 AU). Its orbit an eccentricity of 0.39 and an inclination of 9° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken by the Sloan Digital Sky Survey on 12th March 2005.[1]

Physical characteristics

Diameter and albedo

According to American astronomer Michael Brown, 2014 AN55 is a likely dwarf planet. He estimates a diameter of 561 kilometers, based on an absolute magnitude of 4.6 and an assumed albedo of 0.09.[4] The Johnstons's Archive assumes a similar albedo and calculates a diameter of 671 kilometers[3], which correlates with the MPC/JPL magnitude of 4.1.[5] Using the intermediate 4.3 mag AstDyS datum, and a typical potential albedo range of 0.05 to 0.25, a wider range of possible sizes from 367 to 821 km can be calculated.

Numbering and naming

This minor planet has neither been numbered nor named.[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "2014 AN55". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=2014+AN55. Retrieved 16 February 2018. 
  2. ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: (2014 AN55)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3755680. Retrieved 16 February 2018. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Johnston, Wm. Robert (30 December 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 16 February 2018. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. http://web.gps.caltech.edu/~mbrown/dps.html. Retrieved 16 February 2018. 
  5. ↑ 5.0 5.1 "Conversion of Absolute Magnitude to Diameter for Minor Planets". Archived from the original on 23 July 2011. https://web.archive.org/web/20110723191750/http://www.physics.sfasu.edu/astro/asteroids/sizemagnitude.html. Retrieved 15 August 2019. 
  6. ↑ "2014 AN55". https://newton.spacedys.com/astdys/index.php?n=2014AN55&pc=1.1.0. Retrieved 15 August 2019. 

External links




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