2014 FZ71
| Discovery[1] | |
|---|---|
| Discovered by | CTIO |
| Discovery site | CTIO (first observed only) |
| Discovery date | 24 March 2014 |
| Designations | |
| 2014 FZ71 | |
| Orbital characteristics[2] | |
| Epoch27 April 2019 (JD2458600.5) | |
| Uncertainty parameter6 | |
| Observation arc | 1.96yr(716 d) |
| Aphelion | 95.791AU |
| Perihelion | 55.849 AU |
| 75.820 AU | |
| Eccentricity | 0.2634 |
| 660.21 yr (241,142 d) | |
| 349.80° | |
| 0° 0m5.4s/ day | |
| Inclination | 25.506° |
| 306.01° | |
| 244.94° | |
| Physical characteristics | |
| 24.61[8] | |
| 6.9[1][2] | |
2014 FZ71is atrans-Neptunian object,ascattered discclassified as ascatteredanddetached object,located in the outermost region of theSolar System.It was first observed on 24 March 2014, by a team led by American astronomerScott Sheppardat theCerro Tololo Inter-American Observatoryin Chile. With itsperihelionof almost 56 AU, it belongs to a small and poorly understood group of very distant objects with moderate eccentricities.[6][9]The object is not adwarf planet candidateas it only measures approximately 150 kilometers (93 miles) in diameter.
Discovery and naming
[edit]2014 FZ71was first observed on 24 March 2014 by a team of astronomers led by Scott Sheppard of theCarnegie Institution for Scienceas part of the survey for distant solar system objects beyond theKuiper Cliffusing the new wide-field cameras on theSubaruandCerro Tololo Inter-American Observatory (CTIO)telescopes.[6]
Orbit and classification
[edit]
2014 FZ71orbits the Sun at a distance of 55.8–95.8AUonce every 660 years and 3 months (241,142 days;semi-major axisof 75.82 AU). Its orbit has a moderateeccentricityof 0.26 and aninclinationof 26°with respect to theecliptic.[2]
The object belongs to the same orbital group as2004 XR190( "Buffy" ),2014 FC72,2015 FJ345and2015 KQ174(also see diagram).With an orbital period of 660 years, it seems to beresonant trans-Neptunian objectsin a 1:4resonancewith Neptune, as are2003 LA7and2011 UP411,[5]but with a lower eccentricity and therefore higherperihelion.
Considered ascatteredanddetached object,[3][4][5]2014 FZ71is particularly unusual as it has an unusually circular orbit for ascattered-disc object(SDO). Although it is thought that traditional scattered-disc objects have been ejected into their current orbits by gravitational interactions withNeptune,the low eccentricity of its orbit and the distance of its perihelion (SDOs generally have highly eccentric orbits and perihelia less than 38 AU) seems hard to reconcile with such celestial mechanics. This has led to some uncertainty as to the current theoretical understanding of the outerSolar System.The theories include close stellar passages,unseen planet/rogue planets/planetary embryosin the earlyKuiper belt,andresonanceinteraction with anoutward-migrating Neptune.TheKozai mechanismis capable of transferring orbital eccentricity to a higher inclination.[9]
Physical characteristics
[edit]2014 FZ71has a diameter estimated between 125 and 185 kilometers,[6][7][5]roughly a quarter the size of2004 XR190( "Buffy" ) which is estimated at 500 kilometres (310 mi), roughly a quarter the size ofPluto.It is therefore not adwarf planet candidate.[7]
References
[edit]- ^abc"2014 FZ71".Minor Planet Center.Retrieved12 December2018.
- ^abcd"JPL Small-Body Database Browser: (2014 FZ71)"(2016-03-09 last obs.).Jet Propulsion Laboratory.Retrieved12 December2018.
- ^abJewitt, David, Morbidelli, Alessandro, & Rauer, Heike. (2007).Trans-Neptunian Objects and Comets: Saas-Fee Advanced Course 35. Swiss Society for Astrophysics and Astronomy.Berlin: Springer.ISBN3-540-71957-1.
- ^abLykawka, Patryk Sofia; Mukai, Tadashi (July 2007). "Dynamical classification of trans-neptunian objects: Probing their origin, evolution, and interrelation".Icarus.189(1): 213–232.Bibcode:2007Icar..189..213L.doi:10.1016/j.icarus.2007.01.001.
- ^abcdefJohnston, Wm. Robert (7 October 2018)."List of Known Trans-Neptunian Objects".Johnston's Archive.Retrieved12 December2018.
- ^abcdSheppard, Scott S.; Trujillo, Chadwick; Tholen, David J. (July 2016)."Beyond the Kuiper Belt Edge: New High Perihelion Trans-Neptunian Objects with Moderate Semimajor Axes and Eccentricities".The Astrophysical Journal Letters.825(1): 7.arXiv:1606.02294.Bibcode:2016ApJ...825L..13S.doi:10.3847/2041-8205/825/1/L13.S2CID118630570.
- ^abcdBrown, Michael E."How many dwarf planets are there in the outer solar system?".California Institute of Technology.Retrieved12 December2018.
- ^"2014 FZ71 – Ephemerides".AstDyS-2, Asteroids – Dynamic Site, Department of Mathematics, University of Pisa, Italy.Retrieved12 December2018.
- ^abAllen, R. L.; Gladman, B.; Kavelaars, J. J.; Petit, J.-M.; Parker, J. W.; Nicholson, P. (March 2006). "Discovery of a Low-Eccentricity, High-Inclination Kuiper Belt Object at 58 AU".The Astrophysical Journal.640(1): L83–L86.arXiv:astro-ph/0512430.Bibcode:2006ApJ...640L..83A.doi:10.1086/503098.S2CID15588453.(Discovery paper)
External links
[edit]- List Of Centaurs and Scattered-Disk Objects,Minor Planet Center
- List of Known Trans-Neptunian Objects,Johnston's Archive
- 2014 FZ71atAstDyS-2, Asteroids—Dynamic Site
- 2014 FZ71at theJPL Small-Body Database
