| 词条 | (501581) 2014 OB394 |
| 释义 |
| minorplanet = yes | name = {{mp|(501581) 2014 OB|394}} | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = Pan-STARRS 1 | discovery_site = Haleakalā Obs. | discovered = 25 August 2012 | mpc_name = (501581) {{mp|2014 OB|394}} | alt_names = {{mp|2014 OB|394}} | pronounced = | named_after = | mp_category = TNO {{·}}other [3] p-DP [4]{{·}}distant [1] | orbit_ref = | epoch = 27 April 2019 (JD 2458600.5) | uncertainty = 3 | observation_arc = 5.08 yr (1,857 d) | aphelion = 58.222 AU | perihelion = 35.036 AU | semimajor = 46.629 AU | eccentricity = 0.2486 | period = 318.42 yr (116,302 d) | mean_anomaly = 353.23° | mean_motion = {{Deg2DMS|0.0031|sup=ms}} / day | inclination = 20.739° | asc_node = 8.0853° | arg_peri = 9.7242° | mean_diameter = {{val|255|ul=km}} {{small|(est.)}}[4] {{val|267|u=km}} {{small|(est.)}}[3] | rotation = | albedo = {{val|0.08}} {{small|(assumed)}}[4] {{val|0.09}} {{small|(assumed)}}[3] | spectral_type = | abs_magnitude = 6.1[1] }} {{mp|(501581) 2014 OB|394}}, provisional designation {{mp|2014 OB|394}}, is a trans-Neptunian object from the outermost region of the Solar System, approximately {{convert|260|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 25 August 2012, by astronomers with the Pan-STARRS survey at Haleakala Observatory, Hawaii, United States.[1] The weak dwarf planet candidate was numbered in 2017 and remains without a name. Orbit and classification{{mp|2014 OB|394}} orbits the Sun at a distance of 35.0–58.2 AU once every 318 years and 5 months (116,302 days; semi-major axis of 46.63 AU). Its orbit has an eccentricity of 0.25 and an inclination of 21° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Haleakala Observatory in August 2012.[1]Numbering and namingThis minor planet was numbered by the Minor Planet Center on 5 October 2017 and received the number {{LoMP|501581|501581}} in the minor planet catalog ({{small|M.P.C. 106397}}).[16] As of 2018, it has not been named.[1] Physical characteristicsAccording to American astronomer Michael Brown and the Johnston's archive, {{mp|2014 OB|394}} measures 255 and 267 kilometers in diameter based on an assumed albedo of 0.08 and 0.09, respectively.[3][4] On his website, Brown lists this object as a "possible" dwarf planet (200–400 km), which is the category with the lowest certainty in his 5-class taxonomic system.[4] As of 2018, no spectral type and color indices, nor a rotational lightcurve have been obtained from spectroscopic and photometric observations. The body's color, rotation period, pole and shape remain unknown.[22] References1. ^1 2 3 4 5 6 {{cite web |title = 501581 (2014 OB394) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=501581 |accessdate = 3 December 2018}} [1][2][3][4][5]2. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 3 December 2018}} 3. ^1 2 3 4 {{cite web |title = List of Known Trans-Neptunian Objects |work = Johnston's Archive |date = 7 October 2018 |last = Johnston |first= Wm. Robert |url = http://www.johnstonsarchive.net/astro/tnoslist.html |accessdate = 3 December 2018}} 4. ^1 2 3 4 5 {{cite web |title = How many dwarf planets are there in the outer solar system? |publisher = California Institute of Technology |last = Brown |first= Michael E. |url = http://web.gps.caltech.edu/~mbrown/dps.html |accessdate = 3 December 2018}} 5. ^1 {{cite web |title = LCDB Data for (501581) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=501581%7C |accessdate = 3 December 2018}} }} External links
4 : Trans-Neptunian objects|Discoveries by Pan-STARRS|Possible dwarf planets|Astronomical objects discovered in 2012 |
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