| 词条 | (506479) 2003 HB57 |
| 释义 |
| minorplanet = yes | name = (506479) {{mp|2003 HB|57}} | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = | discoverer = Mauna Kea Obs. | discovery_site = Mauna Kea Obs. | discovered = 26 April 2003 | mpc_name = (506479) {{mp|2003 HB|57}} | alt_names = {{mp|2003 HB|57}} | pronounced = | named_after = | mp_category = TNO {{·}}E-SDO [4][5] distant [2]{{·}}detached | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 4 | observation_arc = 13.94 yr (5,090 days) | aphelion = 294.21 AU | perihelion = 38.109 AU | semimajor = 166.16 AU | eccentricity = 0.7706 | period = 2141.87 yr (782,317 days) | mean_anomaly = 1.4255° | mean_motion = {{Deg2DMS|0.0005|sup=ms}} / day | inclination = 15.473° | asc_node = 197.82° | arg_peri = 11.013° | mean_diameter = 147 km[4] 200 km[9] | rotation = | albedo = 0.04[9] 0.09[4] | spectral_type = BR [4] | abs_magnitude = 7.4{{·}}7.6[9] }}{{mp|(506479) 2003 HB|57}}, is an extreme trans-Neptunian object of the extended scattered disc in the outermost region of the Solar System, approximately 180 kilometers in diameter. It was discovered by astronomers at the Mauna Kea Observatory on 26 April 2003.[2] Description{{mp|2003 HB|57}} orbits the Sun at a distance of 38.1–294.2 AU once every 2141 years and 10 months (782,317 days). Its orbit has an eccentricity of 0.77 and an inclination of 15° with respect to the ecliptic.Extended scattered discIt is one of a small group of extreme trans-Neptunian objects with perihelion distances of 30 AU or more, and semi-major axes of 150 AU or more.[17] Such objects can not have reached their present-day orbits without the gravitational influence of some perturbing object, which lead to the speculation of planet nine.[18][19] Physical characterization{{mp|2003 HB|57}} has a BR-type spectrum and an estimated diameter of 147 and 200 kilometers based on an assumed albedo of 0.09 and 0.04, respectively.[4][9]References1. ^1 2 3 {{cite web |title = 506479 (2003 HB57) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=506479 |accessdate = 9 December 2017}} [1][2][3][4][5][6][7]2. ^1 2 3 4 5 {{cite web |title = List of Known Trans-Neptunian Objects |work = Johnston's Archive |date = 15 October 2017 |author = Johnston, Wm. Robert |url = http://www.johnstonsarchive.net/astro/tnoslist.html |accessdate = 16 November 2017}} 3. ^1 2 3 4 {{cite web |title = How many dwarf planets are there in the outer solar system? |publisher = California Institute of Technology |author = Michael E. Brown |url = http://web.gps.caltech.edu/~mbrown/dps.html |accessdate = 30 July 2017}} 4. ^1 {{cite web |title = List Of Centaurs and Scattered-Disk Objects |work = Minor Planet Center |url = http://www.minorplanetcenter.org/iau/lists/Centaurs.html |accessdate = 9 December 2017}} 5. ^1 minorplanetcenter.net: q>30, a>150 6. ^1 {{Cite journal |first1 = Scott S. |last1 = Sheppard |first2 = Chadwick |last2 = Trujillo |date = December 2016 |title = New Extreme Trans-Neptunian Objects: Toward a Super-Earth in the Outer Solar System |url = https://arxiv.org/pdf/1608.08772.pdf |journal = The Astronomical Journal |volume = 152 |issue = 6 |page = 18 |bibcode = 2016AJ....152..221S |doi = 10.3847/1538-3881/152/6/221 |arxiv = 1608.08772 |access-date= 9 December 2017}} 7. ^1 {{cite journal |last1 = de la Fuente Marcos |first1=Carlos |last2 = de la Fuente Marcos |first2=Raúl |title = Finding Planet Nine: apsidal anti-alignment Monte Carlo results |journal = Monthly Notices of the Royal Astronomical Society |date = 21 October 2016 |volume = 462 |issue = 2 |pages = 1972–1977 |arxiv = 1607.05633 |doi = 10.1093/mnras/stw1778 |bibcode = 2016MNRAS.462.1972D}} }} External links
3 : Scattered disc and detached objects|Extreme trans-Neptunian objects|Astronomical objects discovered in 2003 |
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