| 词条 | 52975 Cyllarus |
| 释义 |
| minorplanet = yes | name = 52975 Cyllarus | background = #C7FF8F | image = Cyllarus-Keck-Nov2009-mag23.gif | image_size = 240 | caption = {{longitem|Cyllarus as seen by the Keck telescope at an apparent magnitude of 23|style=padding:4px 0;}} | discovery_ref = | discovered = 12 October 1998 | discoverer = N. Danzl | discovery_site = Kitt Peak National Obs. | mpc_name = (52975) Cyllarus | alt_names = {{mp|1998 TF|35}} | pronounced = {{IPAc-en|ˈ|s|ɪ|l|ər|ə|s}} | named_after = {{nowrap|Cyllarus {{small|(Greek mythology)}}[2]}} | mp_category = distant [3]{{·}}centaur [5] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 4 | observation_arc = 9.95 yr (3,636 days) | aphelion = 35.971 AU | perihelion = 16.254 AU | semimajor = 26.113 AU | eccentricity = 0.3775 | period = 133.44 yr (48,739 days) | mean_anomaly = 75.673° | mean_motion = {{Deg2DMS|0.0074|sup=ms}} / day | inclination = 12.651° | asc_node = 52.073° | arg_peri = 300.77° | tisserand = 4.2470 | dimensions = 70 km {{small|(generic at 0.07)}}[7] | rotation = | albedo = | spectral_type = | magnitude = 23.93[8] | abs_magnitude = 9.4 }}52975 Cyllarus ({{IPAc-en|ˈ|s|ɪ|l|ər|ə|s}}), provisionally designated {{mp|1998 TF35}}, is a centaur orbiting in the outer Solar System. It was discovered on 12 October 1998, by American astronomer Nichole Danzl at the Kitt Peak National Observatory near Sells, Arizona, in the United States.[3] It was later named after the mythological creature Cyllarus.[2] Orbit and classificationCyllarus orbits the Sun in the outer main-belt at a distance of 16.3–36.0 AU once every 133 years and 5 months (48,739 days). Its orbit has an eccentricity of 0.38 and an inclination of 13° with respect to the ecliptic. Cyllarus came to perihelion in September 1989. The body's observation arc begins with its official discovery observation at Kitt Peak, as no precoveries were taken, and no prior identifications were made.[3]Physical characteristicsIn November 2009, Mike Brown and his team using the Keck telescope took a spectrum of Cyllarus (apparent magnitude 23), giving it "the record for the faintest spectrum of a Kuiper belt object".{{citation needed|date=April 2017}} As of 2017, no rotational lightcurve has been obtained from photometric observations. The body's rotation period and shape, as well as its spectral type remains unknown.[15] Based on a generic magnitude-to-diameter conversion, Cyllarus measures roughly about 70 kilometers in diameter, assuming a typical albedo of 0.07 for a centaur.[7] It has an absolute magnitude of 9.4. NamingThis minor planet was named for the Cyllarus, a centaur of Greek mythology.[2] The approved naming citation was published on 14 June 2003 ({{small|M.P.C. {{MoMP|52975|49102}}}}).[19] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (52975) Cyllarus, Addendum to Fifth Edition: 2003–2005 |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 217 |date = 2006 |isbn = 978-3-540-34361-5 |doi = 10.1007/978-3-540-34361-5_2577 |chapter = (52975) Cyllarus [26.3, 0.38, 12.6] }} [1][2][3][4][5][6][7]2. ^1 2 3 {{cite web |title = 52975 Cyllarus (1998 TF35) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=52975 |accessdate = 25 April 2017}} 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 = 25 April 2017}} 4. ^1 {{cite web |author = Marc W. Buie |type = 2008-09-25 using 29 observations |title = Orbit Fit and Astrometric record for 52975 |publisher = SwRI (Space Science Department) |url = http://www.boulder.swri.edu/~buie/kbo/astrom/52975.html |accessdate = 2009-11-22}} 5. ^1 {{cite web |title = AstDys (52975) Cyllarus Ephemerides |publisher = Department of Mathematics, University of Pisa, Italy |url = http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=52975 |accessdate = 25 April 2017}} 6. ^1 2 {{cite web |title = Absolute Magnitude (H) |publisher = NASA/JPL |url = http://neo.jpl.nasa.gov/glossary/h.html |accessdate = 25 April 2017}} 7. ^1 {{cite web |title = LCDB Data for (52975) Cyllarus |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=52975%7CCyllarus |accessdate = 25 April 2017}} }} External links
5 : Centaurs (minor planets)|Discoveries by Nichole M. Danzl|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1998 |
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