| 词条 | (48639) 1995 TL8 |
| 释义 |
| minorplanet = yes | name = {{mp|(48639) 1995 TL|8}} | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = [2] | discoverer = A. Gleason {{small|(Spacewatch)}} | discovery_site = {{nowrap|Kitt Peak National Obs.}} | discovered = 15 October 1995 | mpc_name = {{mp|(48639) 1995 TL|8}} | alt_names = {{mp|1995 TL|8}} | pronounced = | named_after = | mp_category = TNO {{·}}SDO [4] detached [5]{{·}}distant [2] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 2 | observation_arc = 19.30 yr (7,049 days) | aphelion = 64.486 AU | perihelion = 39.969 AU | semimajor = 52.227 AU | eccentricity = 0.2347 | period = 377.45 yr (137,863 days) | mean_anomaly = 44.811° | mean_motion = {{Deg2DMS|0.0026|sup=ms}} / day | inclination = 0.2478° | asc_node = 260.27° | arg_peri = 83.589° | satellites = 1 (D: 80 km)[8] | dimensions = 176 km[8] 420.27 km {{small|(calculated)}}[10] 495 km {{small|(estimated)}}[11] | rotation = | albedo = 0.07 {{small|(estimated)}}[11] 0.10 {{small|(assumed)}}[10] 0.369[8] | spectral_type = RR [15]{{·}}C {{small|(assumed)}}[10] | abs_magnitude = {{val|4.667|0.091}} {{small|(R)}}[17]{{·}}5.0[10]{{·}}5.1[11]{{·}}{{val|5.290|0.060}}{{efn|name=lcdb-Lellouch-2013}} }}{{mp|(48639) 1995 TL|8}} is a binary trans-Neptunian object from the scattered disc in the outermost regions of the Solar System. It was discovered by Arianna Gleason in 1995 and measures approximately 176 kilometers in diameter. Its 80-kilometer minor-planet moon, provisionally designated {{mp|S/2002 (48639) 1}}, was discovered on 9 November 2002.[8] Discovery{{mp|1995 TL|8}} was discovered on 15 October 1995, by American astronomer Arianna Gleason as part of UA's Spacewatch survey at Kitt Peak National Observatory, near Tucson, Arizona.[2]It was the first of the bodies presently classified as a scattered-disc object (SDO)[4] to be discovered, preceding the SDO prototype {{mpl|(15874) 1996 TL|66}} by almost a year.{{citation needed|date=November 2017}} SatelliteA companion was discovered by Denise C. Stephens and Keith S. Noll, from observations with the Hubble Space Telescope taken on 9 November 2002, and announced on 5 October 2005. The satellite, designated {{mp|S/2002 (48639) 1}}, is relatively large, having a likely mass of about 10% of the primary. Its orbit has not been determined, but it was at a separation of only about {{convert|420|km|mi}} to the primary at the time of discovery, with a possible orbital period of about half a day and an estimated diameter of {{convert|161|km|mi}}.[8] Scattered–extended object{{mp|1995 TL|8}} is classified as detached object (scattered–extended) by the Deep Ecliptic Survey, since its orbit appears to be beyond significant gravitational interactions with Neptune's current orbit.[5] However, if Neptune migrated outward, there would have been a period when Neptune had a higher eccentricity.Simulations made in 2007 show that {{mp|1995 TL|8}} appears to have less than a 1% chance of being in a 3:7 resonance with Neptune, but it does execute circulations near this resonance.[26] {{multiple image|direction = horizontal |align = left |width1 = 190 |width2 = 280 |image1 = 1995 TL8 AnimLong.gif |image2 = 1995TL8 Orbital Period.jpg |footer = Left: The near 3:7 resonance pattern of {{mp|1995 TL|8}} with Neptune only moves clockwise. It never halts and reverses course (i.e. librates). Right: The orbital period of {{mp|1995 TL|8}} missing the 7:3 (2.333) resonance of Neptune }}{{clear|left}} Numbering and namingThis minor planet was numbered by the Minor Planet Center on 20 November 2002.[27] As of 2018, it has not been named.[2] See also
Notes{{notelist|refs={{efn|name=lcdb-Lellouch-2013|1=Lellouch (2013): observations on 11 February 2011 gave an absolute magnitude of {{val|5.290|0.060}}. Summary figures for (48639) at LCDB not found at ADS (2013A&A...557...60L)}}}} References1. ^1 2 3 4 {{cite web |title = 48639 (1995 TL8) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=48639 |accessdate = 16 November 2017}} [1][2][3][4][5][6][7][8][9][10]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 = 24 February 2018}} 3. ^1 2 3 4 5 {{cite web |title = Asteroids with Satellites Database – (48639) 1995 TL8 |work = Johnston's Archive |date = 21 September 2014 |author = Johnston, Wm. Robert |url = http://www.johnstonsarchive.net/astro/astmoons/am-48639.html |accessdate = 16 November 2017}} 4. ^1 2 {{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}} 5. ^1 2 3 {{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 = 16 November 2017}} 6. ^1 2 {{cite web |author=Marc W. Buie |author-link=Marc W. Buie |date=2003-10-22 |title=Orbit Fit and Astrometric record for 48639 |publisher=SwRI (Space Science Department) |url=http://www.boulder.swri.edu/~buie/kbo/astrom/48639.html |accessdate=2009-01-26}} 7. ^1 {{Cite journal |first1 = V. V. |last1 = Emel'Yanenko |first2 = E. L. |last2 = Kiseleva |date = April 2008 |title = Resonant motion of trans-Neptunian objects in high-eccentricity orbits |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008AstL...34..271E |journal = Astronomy Letters |volume = 34 |issue = 4 |pages = 271–279 |bibcode = 2008AstL...34..271E |doi = 10.1134/S1063773708040075 |access-date= 16 November 2017}} 8. ^1 2 3 4 {{cite web |title = LCDB Data for (48639) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=48639%7C |accessdate = 16 November 2017}} 9. ^1 {{cite journal |first1 = N. |last1 = Peixinho |first2 = A. |last2 = Delsanti |first3 = A. |last3 = Guilbert-Lepoutre |first4 = R. |last4 = Gafeira |first5 = P. |last5 = Lacerda |date = October 2012 |title = The bimodal colors of Centaurs and small Kuiper belt objects |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...546A..86P |journal = Astronomy and Astrophysics |volume = 546 |page = 12 |bibcode = 2012A&A...546A..86P |doi = 10.1051/0004-6361/201219057 |arxiv = 1206.3153 |access-date= 16 November 2017}} 10. ^1 {{Cite journal |first1 = Irina N. |last1 = Belskaya |first2 = Maria A. |last2 = Barucci |first3 = Marcello |last3 = Fulchignoni |first4 = Anatolij N. |last4 = Dovgopol |date = April 2015 |title = Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..250..482B |journal = Icarus |volume = 250 |pages = 482–491 |bibcode = 2015Icar..250..482B |doi = 10.1016/j.icarus.2014.12.004 |access-date= 16 November 2016}} }} External links
6 : Scattered disc and detached objects|Discoveries by Arianna E. Gleason|Binary trans-Neptunian objects|Possible dwarf planets|Astronomical objects discovered in 1995|Astronomical objects discovered in 2002 |
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