| 词条 | (79983) 1999 DF9 |
| 释义 |
| minorplanet = yes | name = {{mp|(79983) 1999 DF|9}} | background = #C2E0FF | image = | image_size = | caption = | discovery_ref = | discovered = 20 February 1999 | discoverer = J. X. Luu C. Trujillo D. C. Jewitt | discovery_site = Kitt Peak National Obs. | mpc_name = {{mp|(79983) 1999 DF|9}} | alt_names = {{mp|1999 DF|9}} | pronounced = | named_after = | mp_category = TNO {{·}}cubewano [3][4] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 2 | observation_arc = 17.06 yr (6,231 days) | aphelion = 53.567 AU | perihelion = 39.830 AU | semimajor = 46.698 AU | eccentricity = 0.1471 | period = 319.12 yr (116,560 days) | mean_anomaly = 19.489° | mean_motion = {{Deg2DMS|0.0031|sup=ms}} / day | inclination = 9.8105° | asc_node = 334.84° | arg_peri = 178.63° | dimensions = 265 km {{small|(calculated)}}[6] 306 km[4] | rotation = {{val|6.65}} h[8] | albedo = 0.10 {{small|(assumed)}}[6] | spectral_type = C [6] B–V = {{val|0.920|0.060}}[11] V–R = {{val|0.710|0.050}}[11] V–I = {{val|1.360|0.060}}[11] | abs_magnitude = {{val|5.797|0.110}} {{small|(R)}}[14]{{·}}6.0[6] }} {{mp|(79983) 1999 DF|9}} is a trans-Neptunian object of the Kuiper belt, classified as a non-resonant cubewano, that measures approximately 270 kilometers in diameter. DiscoveryIt was discovered on 20 February 1999, by American and British astronomers Jane Luu, Chad Trujillo and David C. Jewitt at the U.S. Kitt Peak National Observatory in Arizona.[17] As no precoveries were taken, the minor planet's observation arc begins with its discovery observation in 1999.[17] Classification and orbitThe carbonaceous minor planet is a classical Kuiper belt object or "cubewano", which are not in an orbital resonance with Neptune and do not cross the giant planet's orbit. It orbits the Sun at a distance of 39.8–53.6 AU once every 319 years and 1 month (116,560 days). Its orbit has an eccentricity of 0.15 and an inclination of 10° with respect to the ecliptic. This makes it a relatively eccentric body for a classical Kuiper belt object, which typically have low-eccentricities of 0.10 or less. Physical characteristicsIn February 2001, a rotational lightcurve was published for this minor planet from photometric observations by Portuguese astronomer Pedro Lacerda and the discovering astronomer Jane Luu. Lightcurve analysis gave a relatively short rotation period of {{val|6.65}} hours with a brightness variation of 0.40 magnitude ({{small|U=2}}).[8] The Collaborative Asteroid Lightcurve Link assumes a low albedo of 0.10 and calculates a mean-diameter of 265 kilometers, based on an absolute magnitude of 6.0,[6] while the Johnston's archive give a diameter of 306 kilometers for an albedo of 0.09.[4] Due to its small size, it is unlikely to be classified as a dwarf planet. Numbering and namingThis minor planet was numbered by the Minor Planet Center on 4 May 2004.[23] As of 2018, it has not been named.[17] References1. ^1 2 3 {{cite web |title = 79983 (1999 DF9) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=79983 |accessdate = 31 August 2016}} [1][2][3][4][5][6][7][8]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 {{Cite journal |first1 = O. R. |last1 = Hainaut |first2 = H. |last2 = Boehnhardt |first3 = S. |last3 = Protopapa |date = October 2012 |title = Colours of minor bodies in the outer solar system. II. A statistical analysis revisited |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012A&A...546A.115H |journal = Astronomy and Astrophysics |volume = 546 |page = 20 |bibcode = 2012A&A...546A.115H |doi = 10.1051/0004-6361/201219566 |arxiv = 1209.1896 |access-date= 31 August 2016}} 4. ^1 2 3 {{cite web |title = List of Known Trans-Neptunian Objects |publisher = Johnston's Archive |author = Robert Johnston |date = 7 October 2018 |url = http://www.johnstonsarchive.net/astro/tnoslist.html |access-date= 12 November 2018}} 5. ^1 2 3 4 5 {{cite web |title = LCDB Data for (79983) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=79983%7C |accessdate = 31 August 2016}} 6. ^1 2 {{Cite journal |first1 = Pedro |last1 = Lacerda |first2 = Jane |last2 = Luu |date = April 2006 |title = Analysis of the Rotational Properties of Kuiper Belt Objects |url = https://arxiv.org/pdf/astro-ph/0601257v1.pdf |journal = The Astronomical Journal |volume = 131 |issue = 4 |pages = 2314–2326 |bibcode = 2006AJ....131.2314L |doi = 10.1086/501047 |arxiv = astro-ph/0601257 |access-date= 31 August 2016}} 7. ^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 = https://arxiv.org/pdf/1206.3153v1.pdf |journal = Astronomy and Astrophysics |volume = 546 |page = 12 |bibcode = 2012A&A...546A..86P |doi = 10.1051/0004-6361/201219057 |arxiv = 1206.3153 |access-date= 31 August 2016}} 8. ^1 {{cite web |author=Marc W. Buie |author-link=Marc W. Buie |title=Orbit Fit and Astrometric record for 79983 |publisher=SwRI (Space Science Department) |url=http://www.boulder.swri.edu/~buie/kbo/astrom/79983.html |accessdate=2018-02-17}} }} External links
6 : Trans-Neptunian objects|Classical Kuiper belt objects|Discoveries by Jane Luu|Discoveries by Chad Trujillo|Discoveries by David C. Jewitt|Astronomical objects discovered in 1999 |
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