| 词条 | (523622) 2007 TG422 | ||||||||||||||||||
| 释义 |
| minorplanet = yes | name = (523622) {{mp|2007 TG|422}} | background = #C2E0FF | image = Planet_nine-etnos_now.png | image_size = 255 | caption = Orbital diagram of extreme Trans-neptune objects, including {{Background color|#FF2CFF| {{mp|2007 TG|422}} }} together with the hypothetical Planet Nine | discovery_ref = [1][2] | discoverer = A. C. Becker A. W. Puckett J. Kubica | discovery_site = APO | discovered = 3 October 2007 | mpc_name = (523622) {{mp|2007 TG|422}} | alt_names = {{mp|2007 TG|422}} | pronounced = | named_after = | mp_category = {{nowrap|TNO [4]{{·}}SDO [5][6]{{·}}ESDO [7]}} p-DP [8]{{·}}distant [1] | orbit_ref = [4] | epoch = 27 April 2019 (JD 2458600.5) | uncertainty = 1 | observation_arc = 10.36 yr (3,783 d) | aphelion = 910.01 AU | perihelion = 35.532 AU | semimajor = 472.77 AU | eccentricity = 0.9248 | period = 10279.78 yr (3,754,688 d) | mean_anomaly = 0.4774° | mean_motion = {{Deg2DMS|0.0001|sup=ms}} / day | inclination = 18.620° | asc_node = 112.84° | arg_peri = 285.54° | satellites = | mean_diameter = {{val|222|u=km}}[7] {{val|330|ul=km}}[8] | rotation = | albedo = 0.04 {{small|(est.)}}[8] | spectral_type = blue[8] B–I {{=}} {{val|1.900|0.020}}[15] B–R {{=}} {{val|1.390|0.040}}[15] R–I {{=}} {{val|0.510|0.040}}[15] V–R {{=}} {{val|0.510|0.040}}[15] | magnitude = 22.4[19] | abs_magnitude = 6.5[1][4][8] }}{{mp|(523622) 2007 TG|422}}, provisional designation {{mp|2007 TG|422}}, is a trans-Neptunian object on a highly eccentric orbit in the scattered disc located in the outermost region of the Solar System, approximately {{convert|260|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 3 October 2007 by astronomers Andrew Becker, Andrew Puckett and Jeremy Kubica during the Sloan Digital Sky Survey at Apache Point Observatory in New Mexico, United States.[1] According to American astronomer Michael Brown, the bluish object is "possibly" a dwarf planet.[8] It belongs to a group of objects studied in 2014, which lead to the proposition of the hypothetical Planet Nine.[25] Orbit and classification{{mp|2007 TG|422}} orbits the Sun at a distance of 35.5–910 AU once every 10279 years and 9 months (3,754,688 days; semi-major axis of 473 AU). Its orbit has an exceptionally high eccentricity of 0.92 and an inclination of 19° with respect to the ecliptic.[4]{{mp|2007 TG|422}} is an extended scattered disc object,[7] as its large aphelion distance is similar to that of the detached objects such as the sednoids (e.g. 90377 Sedna), its perihelion distance, however, is much lower and still just inside the gravitational influence of Neptune.[5] The object came to perihelion in 2005 at a heliocentric distance of 35.5 AU,[4] and is currently 37.9 AU from the Sun.[19] It was in the constellation of Taurus until 2018, and came to opposition 29 November 2017. The body's observation arc begins at Apache Point in September 2007, one month prior to its official discovery observation.[1] It has since been observed over a hundred times and has an orbital uncertainty of 1.[4]Unstable heliocentric solutions
Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the aphelion (maximum distance from the Sun) of this object.[1] With a 2007 epoch the object had an approximate period of about 10,611 years with aphelion at 930 AU.[5] But using a 2012 epoch shows a period of about 13,512 years with aphelion at 1099 AU.[34] For objects at such high eccentricity, the Sun's barycentric coordinates are more stable than heliocentric coordinates.[40] Using JPL Horizons with an observed orbital arc of 5 years, the barycentric orbital elements for epoch 2008-May-14 generate a semi-major axis of 503 AU and a period of 11,300 years.[36] For comparison, Sedna has a barycentric semi-major axis of 506 AU and a period of 11,400 years.[36] Both {{mpl|(308933) 2006 SQ|372}} and {{mpl|(87269) 2000 OO|67}} take longer than Sedna and {{mp|2007 TG|422}} to orbit the Sun using barycentric coordinates. Numbering and namingThis minor planet was numbered by the Minor Planet Center on 25 September 2018 ({{small|M.P.C. 111778}}).[43] As of 2018, it has not been named.[1] Physical characteristics{{mp|2007 TG|422}} is expected to have a low albedo (see below) due to its blue (neutral) color.[8]Diameter and albedoAccording to the Johnston's archive and to Michael Brown, {{mp|2007 TG|422}} measures 222 and 331 kilometers in diameter, based on an absolute magnitude of 6.5 and an assumed standard albedo of 0.09 and 0.04 for the body's surface, respectively.[7][8] As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[4][15] Michael Brown's website lists it as a possible dwarf planet.[8] Comparison{{clear|left}}Notes1. ^Read osculating orbit for more details about heliocentric unperturbed two-body solutions 2. ^1 2 3 4 5 6 7 8 {{cite web |type = 2018-01-13 last obs. |title = JPL Small-Body Database Browser: 523622 (2007 TG422) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2523622 |publisher = Jet Propulsion Laboratory |accessdate = 10 October 2018}} 3. ^1 2 3 4 5 6 {{cite web |title = 523622 (2007 TG422) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=523622 |accessdate = 10 October 2018}} 4. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 10 October 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 = 10 October 2018}} 6. ^1 2 3 4 {{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 = 10 October 2018}} 7. ^1 2 3 4 5 6 7 8 9 {{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 = 10 October 2018}} 8. ^1 2 3 4 5 {{cite web |title = Asteroid (523622) 2007 TG422 |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2007+TG422 |accessdate = 10 October 2018}} 9. ^1 2 {{cite web |title = Asteroid (523622) 2007 TG422 |publisher = AstDyS-2, Asteroids – Dynamic Site – Department of Mathematics, University of Pisa, Italy |url = http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=2007TG422 |accessdate = 10 October 2018}} 10. ^1 {{Cite web |title=MPEC 2008-D39: 2007 TG422, 2007 TH422, 2007 TJ422, 2007 UL126, 2007 VH305 |publisher=IAU Minor Planet Center |date=2008-02-26 |url=http://minorplanetcenter.org/mpec/K08/K08D39.html |accessdate=2011-01-30}} (K07Tg2G) 11. ^1 2 3 4 {{Cite web |author=Marc W. Buie |author-link=Marc W. Buie |type=2009-09-28 using 32 of 32 observations |title=Orbit Fit and Astrometric record for 07TG422 |publisher=SwRI (Space Science Department) |url=http://www.boulder.swri.edu/~buie/kbo/astrom/523622.html |archiveurl=https://web.archive.org/web/20150530210009/http://www.boulder.swri.edu/~buie/kbo/astrom/07TG422.html |archivedate=2015-05-30 |deadurl=no |accessdate=2011-01-30}} 12. ^1 2 [https://archive.is/20121213135903/http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007TG422 JPL Epoch 2012-Sep-30 solution] 13. ^1 2 3 {{cite web |date=2011-01-30 |author=Horizons output |url=http://home.surewest.net/kheider/astro/2007TG422Barycenter.txt |title=Barycentric Osculating Orbital Elements for 2007 TG422 |accessdate=2011-01-30 |deadurl=yes |archiveurl=https://web.archive.org/web/20140328023855/http://home.surewest.net/kheider/astro/2007TG422Barycenter.txt |archivedate=March 28, 2014 }} (Horizons) 14. ^1 {{Cite journal |display-authors = 6 |first1 = Nathan A. |last1 = Kaib |first2 = Andrew C. |last2 = Becker |first3 = R. Lynne |last3 = Jones |first4 = Andrew W. |last4 = Puckett |first5 = Dmitry |last5 = Bizyaev |first6 = Benjamin |last6 = Dilday |first7 = Joshua A. |last7 = Frieman |first8 = Daniel J. |last8 = Oravetz |first9 = Kaike |last9 = Pan |first10 = Thomas |last10 = Quinn |first11 = Donald P. |last11 = Schneider |first12 = Shannon |last12 = Watters |date = April 2009 |title = 2006 SQ372: A Likely Long-Period Comet from the Inner Oort Cloud |url = https://arxiv.org/pdf/0901.1690.pdf |journal = The Astrophysical Journal |volume = 695 |issue = 1 |pages = 268–275 |bibcode = 2009ApJ...695..268K |doi = 10.1088/0004-637X/695/1/268 |arxiv = 0901.1690 |access-date= 10 October 2018}} 15. ^1 {{Cite journal |first1 = Chadwick A. |last1 = Trujillo |first2 = Scott S. |last2 = Sheppard |date = March 2014 |title = A Sedna-like body with a perihelion of 80 astronomical units |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014Natur.507..471T |journal = Nature |volume = 507 |issue = 7493 |pages = 471–474 |bibcode = 2014Natur.507..471T |doi = 10.1038/nature13156 |access-date= 10 October 2018}} References{{reflist|30em|refs=[2][3][4][5][6][7][8][9][10][11][12][13][14][15]}} External links
6 : Scattered disc and detached objects|Extreme trans-Neptunian objects|Discoveries by Andrew C. Becker|Discoveries by Andrew W. Puckett|Discoveries by Jeremy Martin Kubica|Astronomical objects discovered in 2007 |
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