| 词条 | 4776 Luyi |
| 释义 |
| minorplanet = yes | name = 4776 Luyi | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = [1] | discoverer = Harvard University | discovery_site = Oak Ridge Obs. | discovered = 3 November 1975 | mpc_name = (4776) Luyi | alt_names = 1975 VD{{·}}{{mp|1982 RD|2}} 1982 UU | pronounced = | named_after = Luyi {{small|(Chinese town)}} [1] | mp_category = main-belt [1]{{·}}{{small|(inner)}} background [5] | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 42.21 yr (15,418 d) | aphelion = 2.8529 AU | perihelion = 1.7765 AU | semimajor = 2.3147 AU | eccentricity = 0.2325 | period = 3.52 yr (1,286 d) | mean_anomaly = 40.564° | mean_motion = {{Deg2DMS|0.2799|sup=ms}} / day | inclination = 5.3929° | asc_node = 3.2435° | arg_peri = 349.13° | mean_diameter = {{val|3.645|0.045|ul=km}}[7] | rotation = | albedo = {{val|0.305|0.030}}[7] | spectral_type = | abs_magnitude = 14.3 }}4776 Luyi, provisional designation {{mp|1975 VD}}, is a bright background asteroid from the inner regions of the asteroid belt, approximately {{convert|3.6|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 3 November 1975, by Harvard astronomers at the Oak Ridge Observatory in Massachusetts, United States. The asteroid was named for the Chinese town of Luyi, birthplace of Laozi who founded Taoism.[1] Luyi is also named after the son of Harvard astronomer Cheng-yuan Shao.[1] Orbit and classificationLuyi is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the inner asteroid belt at a distance of 1.8–2.9 AU once every 3 years and 6 months (1,286 days; semi-major axis of 2.31 AU). Its orbit has an eccentricity of 0.23 and an inclination of 5° with respect to the ecliptic. The body's observation arc begins with its first and official discovery observation at Oak Ridge.[1]Physical characteristicsThe asteroid has an absolute magnitude of 14.3. Its spectral type is unknown. Based on its high albedo (see below), Luyi is a bright asteroid of the S-complex. As of 2018, no rotational lightcurve has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.645 kilometers in diameter and its surface has a high albedo of 0.30.[7] NamingThis minor planet was named after a town in the eastern Henan province of China that was the birthplace of Laozi, founder of Taoism, because long-time participant in Harvard's minor-planet program, astronomer Cheng-yuan Shao (born 1927), came from that town (also see 1881 Shao). The asteroid is also named after his son, Luyi.[1] The official naming citation was published by the Minor Planet Center on 21 November 1991 ({{small|M.P.C. 19339}}).[19] References1. ^1 2 3 4 5 6 7 {{cite web |title = 4776 Luyi (1975 VD) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4776 |accessdate = 9 May 2018}} [1][2][3][4]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 = 9 May 2018}} 3. ^1 2 {{cite web |title = Small Bodies Data Ferret |work = Nesvorny HCM Asteroid Families V3.0 |url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action |accessdate = 9 May 2018}} 4. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = J. |last6 = Dailey |first7 = P. R. M. |last7 = Eisenhardt |first8 = R. S. |last8 = McMillan |first9 = T. B. |last9 = Spahr |first10 = M. F. |last10 = Skrutskie |first11 = D. |last11 = Tholen |first12 = R. G. |last12 = Walker |first13 = E. L. |last13 = Wright |first14 = E. |last14 = DeBaun |first15 = D. |last15 = Elsbury |first16 = T., IV |last16 = Gautier |first17 = S. |last17 = Gomillion |first18 = A. |last18 = Wilkins |date = November 2011 |title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 20 |bibcode = 2011ApJ...741...68M |doi = 10.1088/0004-637X/741/2/68 |arxiv = 1109.4096 |access-date= 9 May 2018}} }} External links
6 : Background asteroids|Discoveries by the Harvard College Observatory|Minor planets named for people|Minor planets named for places|Named minor planets|Astronomical objects discovered in 1975 |
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