| 词条 | 1731 Smuts |
| 释义 |
| minorplanet = yes | name = 1731 Smuts | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discovered = 9 August 1948 | discoverer = E. Johnson | discovery_site = Johannesburg Obs. | mpc_name = (1731) Smuts | alt_names = 1948 PH{{·}}1926 TF 1931 QA{{·}}1935 FS 1938 YB{{·}}1941 KG 1947 LC{{·}}1948 PP 1954 SX{{·}}1960 WE 1966 UY | named_after = Jan Smuts {{small|(Field Marshal; PM)}} [2] | mp_category = main-belt{{·}}{{small|(outer)}} [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 90.22 yr (32,954 days) | aphelion = 3.5712 AU | perihelion = 2.7652 AU | semimajor = 3.1682 AU | eccentricity = 0.1272 | period = 5.64 yr (2,060 days) | mean_anomaly = 41.052° | mean_motion = {{Deg2DMS|0.1748|sup=ms}} / day | inclination = 5.9328° | asc_node = 152.48° | arg_peri = 203.73° | dimensions = 53.83 km {{small|(derived)}}[3] {{val|54.71|0.98}} km[6] {{val|54.784|0.236}}[7] {{val|57.491|0.432}} km[8] | rotation = {{val|12.5|0.7}} h[9] | albedo = 0.0385 {{small|(derived)}}[3] {{val|0.0534|0.0060}}[8] {{val|0.058|0.010}}[7] {{val|0.059|0.003}}[6] | spectral_type = C [3] | abs_magnitude = 10.00[6][8]{{·}}10.5[3] }}1731 Smuts, provisional designation {{mp|1948 PH}}, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 54 kilometers in diameter. It was discovered on 9 August 1948, by South African astronomer Ernest Johnson at Johannesburg Observatory in South Africa, who named it after Field marshal Jan Smuts.[2][20] Classification and orbitSmuts orbits the Sun in the outer main-belt at a distance of 2.8–3.6 AU once every 5 years and 8 months (2,060 days). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic. First identified as {{mp|1926 TF}} in Heidelberg, Smuts{{'}}s first used observation was taken one month later in November 1926, extending the body's observation arc by 22 years prior to its official discovery observation.[20]Physical characteristicsSmuts has been characterized as a carbonaceous C-type asteroid.[3]Rotation periodIn March 2008, a rotational lightcurve of Smuts was obtained from photometric observations by French amateur astronomer René Roy. It gave a rotation period of 12.5 hours with a brightness variation of 0.8 magnitude ({{small|U=2}}).[9] Diameter and albedoAccording to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Smuts measures between 54.71 and 57.49 kilometers in diameter, and its surface has an albedo between 0.053 and 0.059.[6][7][8] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0385 and a diameter of 53.83 kilometers based on an absolute magnitude of 10.5.[3] NamingThis minor planet was named after prominent South African and British Commonwealth statesman, Field Marshal and philosopher, Jan Smuts (1870–1950), under whom the discoverer of the asteroid fought in both World Wars.[2] Smuts captured German South-West Africa in World War I and 0.0385 the only man to sign both of the peace treaties ending the First and Second World Wars. He served as prime minister of South Africa from 1919 until 1924 and again from 1939 until 1948.[2] The official naming citation was published by the Minor Planet Center before November 1977 ({{small|M.P.C. 3933}}).[31] References1. ^1 2 3 4 {{cite book |title = Dictionary of Minor Planet Names – (1731) Smuts |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 137 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1732 |chapter = (1731) Smuts }} [1][2][3][4][5][6][7][8]2. ^1 2 {{cite web |title = 1731 Smuts (1948 PH) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1731 |accessdate = 21 December 2016}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 21 December 2016}} 4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (1731) Smuts |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001731 |accessdate = 21 December 2016}} 5. ^1 2 3 4 5 6 7 {{cite web |title = LCDB Data for (1731) Smuts |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1731%7CSmuts |accessdate = 21 December 2016}} 6. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |access-date= 21 December 2016}} Online catalog 7. ^1 2 3 4 {{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 }} 8. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645 }} }} External links
5 : Background asteroids|Discoveries by Ernest Leonard Johnson|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1948 |
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