| 词条 | 2741 Valdivia |
| 释义 |
| minorplanet = yes | name = 2741 Valdivia | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = | discoverer = C. Torres S. Barros | discovery_site = Cerro El Roble Stn. | discovered = 1 December 1975 | mpc_name = (2741) Valdivia | alt_names = 1975 XG{{·}}1935 CM {{mp|1952 DJ|2}}{{·}}1953 QS {{mp|1969 EB|1}}{{·}}1969 FC {{mp|1973 FX|1}}{{·}}{{mp|1979 UA|1}} {{mp|1990 FO|3}} | pronounced = | named_after = Pedro de Valdivia [2] {{small|(Spanish conquistador)}} | mp_category = main-belt{{·}}{{small|(middle)}} [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 0 | observation_arc = 81.74 yr (29,856 days) | aphelion = 3.0836 AU | perihelion = 2.1352 AU | semimajor = 2.6094 AU | eccentricity = 0.1817 | period = 4.22 yr (1,540 days) | mean_anomaly = 142.32° | mean_motion = {{Deg2DMS|0.2338|sup=ms}} / day | inclination = 10.287° | asc_node = 151.13° | arg_peri = 91.480° | dimensions = {{val|9.13|0.43}} km[5] {{val|10.73|0.64}} km[6] {{val|11.679|0.172}} km[7][8] 17.52 km {{small|(calculated)}}[3] | rotation = {{val|4.096|0.0005}} h[10] {{val|4.096|0.001}} h[11] {{val|4.09668|0.00005}} h[12] {{val|4.098|0.001}} h[13] {{val|8.191|0.0001}} h[14] | albedo = 0.10 {{small|(assumed)}}[3] {{val|0.205|0.035}}[7] {{val|0.2052|0.0350}}[8] {{val|0.244|0.032}}[6] {{val|0.404|0.066}}[5] | spectral_type = S/C [3] | abs_magnitude = {{val|11.764|0.002}} {{small|(R)}}[10]{{·}}11.80[5]{{·}}11.9[3]{{·}}12.00[6][8] }}2741 Valdivia, provisional designation {{mp|1975 XG}}, is a background asteroid from the central regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 1 December 1975, by Chilean astronomers Carlos Torres and Sergio Barros at the Cerro El Roble Station northwest of Santiago de Chile.[27] The asteroid was named after Spanish conquistador Pedro de Valdivia.[2] Orbit and classificationValdivia is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main-belt at a distance of 2.1–3.1 AU once every 4 years and 3 months (1,540 days). Its orbit has an eccentricity of 0.18 and an inclination of 10° with respect to the ecliptic.The asteroid was first identified as {{mp|1935 CM}} at Uccle Observatory in February 1935, where the body's observation arc begins just a two weeks later, or more than 40 years before its official discovery observation at Cerro El Roble.[27] Physical characteristicsRotation periodIn August 2016, the so-far best-rated rotational lightcurve of Valdivia was obtained by the Spanish amateur astronomer group OBAS. Lightcurve analysis gave a rotation period of 4.098 hours with a brightness variation of 0.25 magnitude ({{small|U=3}}).[13] Previously, in May 2003, photometric observations made by Donald P. Pray at the Carbuncle Hill Observatory ({{small|912}}) near Providence, Rhode Island, gave a synodic period of 4.096 hours and an amplitude of 0.40 in magnitude ({{small|U=2+}}).[11] In addition astronomers at the Palomar Transient Factory found a period of 4.096 hours with an amplitude of 0.28 om May 2011 ({{small|U=2}}),[10] and French amateur astronomer René Roy obtained a period of 8.1922 hours (twice the period solution) with an amplitude of 0.36 ({{small|U=2}}).[14] PolesIn 2016, an international study modeled a lightcurve with a concurring period of 4.09668 hours and found two spin axis of (269.0°, −31.0°) and (103.0°, −59.0°) in ecliptic coordinates (λ, β) ({{small|U=n.a.}}).[12] Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Valdivia measures between 9.13 and 11.679 kilometers in diameter and its surface has an albedo between 0.205 and 0.404,[5][7][8] while the Japanese Akari satellite found an albedo of 0.244 and a diameter of 10.73 kilometers.[6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 – a compromise value between the carbonaceous (0.057) and stony (0.20) asteroids – and calculates a diameter of 17.52 kilometers based on an absolute magnitude of 11.9.[3] NamingThis minor planet was named after Spanish conquistador Pedro de Valdivia (1502–1553), who conquered Chile with a small expedition corps after he served under Francisco Pizarro in Peru. Valdivia founded the cities Santiago (1541) and Concepción (1550) and became Chile's first royal governor.[2] The city of Valdivia in southern Chile is also named after him. The official naming citation was published by the Minor Planet Center on 26 March 1986 ({{small|M.P.C. 10546}}).[42] References1. ^1 2 3 {{cite book |title = Dictionary of Minor Planet Names – (2741) Valdivia |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 224 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_2742 |chapter = (2741) Valdivia }} [1][2][3][4][5][6][7][8][9][10][11][12][13]2. ^1 2 {{cite web |title = 2741 Valdivia (1975 XG) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2741 |accessdate = 18 September 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 = 18 September 2017}} 4. ^1 2 {{cite web |title = Asteroids and comets rotation curves – (2741) Valdivia |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#002741 |accessdate = 18 September 2017}} 5. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. 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6 : Background asteroids|Discoveries by Carlos Torres (astronomer)|Discoveries by Sergio Barros|Minor planets named for people|Named minor planets|Astronomical objects discovered in 1975 |
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