| 词条 | (127546) 2002 XU93 |
| 释义 |
| minorplanet = yes | name = {{mp|(127546) 2002 XU|93}} | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = [1] | discoverer = M. W. Buie | discovery_site = {{nowrap|Kitt Peak National Obs.}} | discovered = 4 December 2002 | mpc_name = (127546) {{mp|2002 XU|93}} | alt_names = {{mp|2002 XU|93}} | pronounced = | named_after = | mp_category = TNO {{·}}centaur [4][5][6] distant [1]{{·}}damocloid | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 3 | observation_arc = 8.10 yr (2,957 days) | aphelion = 113.59 AU | perihelion = 21.003 AU | semimajor = 67.299 AU | eccentricity = 0.6879 | period = 552.10 yr (201,654 d) | mean_anomaly = 6.1786° | mean_motion = {{Deg2DMS|0.0018|sup=ms}} / day | inclination = 77.954° | asc_node = 90.404° | arg_peri = 28.135° | tisserand = 1.1670 | mean_diameter = 164 km {{small|(measured)}}[5] {{val|170|50|u=km}}[10] 180 km {{small|(radiometric)}}[11] | rotation = | albedo = 0.038[5] {{val|0.040|0.030}}[10] 0.04 {{small|(radiometric)}}[11] | spectral_type = BB–BR [5] B–R {{=}} {{val|1.2|0.02}}[5][17]{{rp|23}} | abs_magnitude = 7.9[11]{{·}}8.0 }}{{mp|(127546) 2002 XU|93}}, provisional designation {{mp|2002 XU|93}}, is a trans-Neptunian object and centaur on highly inclined and eccentric orbit in the outer region of the Solar System. It measures approximately {{convert|170|km|mi|sp=us}} in diameter and is one of few objects with such an unusual orbit. It was discovered on 4 December 2002, by American astronomer Marc Buie at the Kitt Peak National Observatory in Arizona, United States.[1] Orbit and classification{{mp|2002 XU|93}} orbits the Sun at a distance of 21–114 AU once every 552 years and 1 month (201,654 days; semi-major axis of 67.3 AU). Its orbit has an eccentricity of 0.69 and an inclination of 78° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Kitt Peak in December 2002.[1]This object belongs to the short-lived population of centaurs. Generically, it is also classified as a trans-Neptunian object as its semi-major axis is larger than Neptune's 30.1 AU. Due to this highly inclined and eccentric orbit, and with a Tisserand's parameter of only 1.167, its cometary-like orbit resembles that of the damocloid and extended-centaur population. It is one of few objects with and inclination above 60° and a perihelion below 15 AU, along with the first discovered {{mpl|2008 KV|42}}.[23] Physical characteristics{{mp|2002 XU|93}} has a BB–BR taxonomy type.[5] It shows only a moderately red surface with a spectral gradient similar to the known comets, extinct comets, Jupiter trojans, Neptune trojans, irregular satellites and damocloids.[17]With a B–R magnitude of 1.2,[17]{{rp|23}} the difference between the blue and red filter magnitude, it is still redder than the spectrum of the Sun (which is 1.02 mag).[5] It has an absolute magnitude of 8.0. Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, {{mp|2002 XU|93}} measures 170 kilometers in diameter and its surface has an low albedo of 0.04.[10] The Johnston{{'s}} archive gives a mean-diameter of {{convert|164|km|mi|sp=us}} and albedo of 0.038 from various measurement,[5] while astronomer Michael Brown gives an albedo of 0.04 and a diameter of {{convert|180|km|mi|sp=us}} from radiometric observations, listing an absolute magnitude of 7.9. Due to its small size, Brown does not consider it to be dwarf-planet candidate, grouping it into the "probably not"-category of his classification scheme (also see list of candidates).[11] Rotation periodAs of 2018, no rotational lightcurve of this object has been obtained from photometric observations. The object's rotation period, pole and shape remain unknown.[33] Numbering and namingThis minor planet was numbered by the Minor Planet Center on 14 March 2006 ({{small|M.P.C. 56238}}).[34] It has not yet received an official name.[1] References1. ^1 2 3 4 5 6 {{cite web |title = 127546 (2002 XU93) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=127546 |accessdate = 23 February 2018}} [1][2][3][4][5][6][7][8][9][10]2. ^1 {{cite web |title = MPC database query |work = Minor Planet Center |url = http://minorplanetcenter.net/db_search/show_by_properties?perihelion_distance_min=15&inclination_min=60 |accessdate = 23 February 2018}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = http://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 23 February 2018}} 4. ^1 2 3 {{Cite journal |display-authors = 6 |first1 = James M. |last1 = Bauer |first2 = Tommy |last2 = Grav |first3 = Erin |last3 = Blauvelt |first4 = A. K. |last4 = Mainzer |first5 = Joseph R. |last5 = Masiero |first6 = Rachel |last6 = Stevenson |first7 = Emily |last7 = Kramer |first8 = Yan R. |last8 = Fernández |first9 = C. M. |last9 = Lisse |first10 = Roc M. |last10 = Cutri |first11 = Paul R. |last11 = Weissman |first12 = John W. |last12 = Dailey |first13 = Frank J. |last13 = Masci |first14 = Russel |last14 = Walker |first15 = Adam |last15 = Waszczak |first16 = Carrie R. |last16 = Nugent |first17 = Karen J. |last17 = Meech |first18 = Andrew |last18 = Lucas |first19 = George |last19 = Pearman |first20 = Ashlee |last20 = Wilkins |first21 = Jessica |last21 = Watkins |first22 = Shrinivas |last22 = Kulkarni |first23 = Edward L. |last23 = Wright |first24 = |last24 = WISE Team |first25 = |last25 = PTF Team |date = August 2013 |title = Centaurs and Scattered Disk Objects in the Thermal Infrared: Analysis of WISE/NEOWISE Observations |url = https://arxiv.org/pdf/1306.1862.pdf |journal = The Astrophysical Journal |volume = 773 |issue = 1 |page = 11 |bibcode = 2013ApJ...773...22B |doi = 10.1088/0004-637X/773/1/22 |arxiv = 1306.1862 |access-date= 23 February 2018}} 5. ^1 {{cite web |title = List Of Centaurs and Scattered-Disk Objects |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/lists/t_centaurs.html |accessdate = 23 February 2018}} 6. ^1 {{cite web |title = LCDB Data for (127546) 2002 XU93 |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=127546%7C2002+XU93 |accessdate = 23 February 2018}} 7. ^1 2 3 4 5 6 7 8 {{cite web |title = List of Known Trans-Neptunian Objects |work = Johnston's Archive |date = 30 December 2017 |last = Johnston |first= Wm. Robert |url = http://www.johnstonsarchive.net/astro/tnoslist.html |accessdate = 23 February 2018}} 8. ^1 2 3 4 {{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 = 23 February 2018}} 9. ^1 {{cite web |last = Buie |first = Marc W. |title = Orbit Fit and Astrometric record for 127546 |publisher = SwRI (Space Science Department) |url = http://www.boulder.swri.edu/~buie/kbo/astrom/127546.html |accessdate = 23 February 2018}} 10. ^1 2 3 {{Cite journal |last = Sheppard |first= Scott S. |date = April 2010 |title = The Colors of Extreme Outer Solar System Objects |url = https://arxiv.org/pdf/1001.3674.pdf |journal = The Astronomical Journal |volume = 139 |issue = 4 |pages = 1394–1405 |bibcode = 2010AJ....139.1394S |doi = 10.1088/0004-6256/139/4/1394 |arxiv = 1001.3674 |access-date= 23 February 2018}} }} External links
4 : Extended centaurs|Damocloids|Discoveries by Marc W. Buie|Astronomical objects discovered in 2002 |
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