| 词条 | (456938) 2007 YV56 |
| 释义 |
| minorplanet = yes | name = (456938) {{mp|2007 YV|56}} | background = #FFC2E0 | image = | image_size = | caption = | discovery_ref = [1] | discoverer = CSS | discovery_site = Mount Lemmon Obs. | discovered = 31 December 2007 | mpc_name = (456938) {{mp|2007 YV|56}} | alt_names = {{mp|2007 YV|56}} | pronounced = | named_after = | mp_category = {{nowrap|NEO{{·}}Apollo{{·}}PHA [1]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 8.10 yr (2,959 days) | aphelion = 2.5556 AU | perihelion = 0.5952 AU | semimajor = 1.5754 AU | eccentricity = 0.6222 | period = 1.98 yr (722 days) | mean_anomaly = 87.984° | mean_motion = {{Deg2DMS|0.4984|sup=ms}} / day | inclination = 6.2441° | asc_node = 102.42° | arg_peri = 265.73° | moid = 0.0047 AU (1.83 LD) | venus_moid = 0.0019 AU | mars_moid = 0.0571 AU | mean_diameter = {{val|0.19|ul=km}} {{small|(est. at 0.20)}}[6] {{val|0.36|u=km}} {{small|(est. at 0.057)}}[6] | rotation = | albedo = | spectral_type = | abs_magnitude = 21.0 }}{{mp|(456938) 2007 YV|56}}, provisional designation {{mp|2007 YV|56}}, is a sub-kilometer asteroid on an eccentric orbit, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately {{convert|190|-|360|m|ft|sigfig=2|sp=us}} in diameter. It was discovered on 31 December 2007, by astronomers of the Catalina Sky Survey conducted at the Catalina Station in Arizona, United States.[1] Orbit and classification{{mp|2007 YV|56}} is an Apollo asteroid that crosses the orbit of Earth.[1] Apollo's are the largest group of near-Earth objects with nearly 10 thousand known members.[12]It orbits the Sun at a distance of 0.60–2.55 AU once every 2 years (722 days; semi-major axis of 1.58 AU). Its orbit has a high eccentricity of 0.62 and an inclination of 6° with respect to the ecliptic. This makes it also a Mars-crossing asteroid, as it crosses the orbit of the Red Planet at 1.66 AU, as well as a Venus-crosser due to its aphelion of less than 0.71 AU. The body's observation arc begins at Catalina with its official discovery observation in December 2007.[1] Close approaches{{mp|2007 YV|56}} has a minimum orbital intersection distance (MOID) with Earth of {{convert |0.0047 |AU |km mi |abbr=on |lk=off |sigfig=3 |order=flip}}, which corresponds to 1.83 lunar distances (LD). It has an absolute magnitude of 21.0. This makes it a potentially hazardous asteroid,[1] which are defined as having a MOID of less than {{convert|0.05|AU|LD|abbr=on}} and an absolute magnitude brighter than 22. Besides Earth, it also makes close approaches to Venus, Mars and the Moon.On 26 December 2007, five days prior to its discovery observation, it passed Earth at a nominal distance of {{convert|0.10037|AU|LD|abbr=on}}. On 2 January 2102, it is predicted to flyby Earth at {{convert|0.00159|AU|LD|abbr=on}} and pass the Moon at a similar distance five hours earlier as well (also see {{section link|List of asteroid close approaches to Earth|Predicted encounters}}). {{Large near earth asteroid flybys 1LD}}Physical characteristicsThe body's spectral type is unknown. Near-Earth asteroids are often of a stony composition. Diameter and albedoBased on a generic magnitude-to-diameter conversion, {{mp|2007 YV|56}} measures {{convert|190|-|360|m|ft|sp=us}} in diameter, for an absolute magnitude of 21.0, and an assumed albedo of 0.20 and 0.057, which represent typical values for stony and carbonaceous asteroids, respectively.[6] Rotation periodAs of 2018, no rotational lightcurve of {{mp|2007 YV|56}} has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. Numbering and namingThis minor planet was numbered by the Minor Planet Center on 22 February 2016 ({{small|M.P.C. 98584}}).[22] As of 2018, it has not been named.[1] References1. ^1 2 3 4 5 6 7 8 {{cite web |title = 456938 (2007 YV56) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=456938 |accessdate = 27 February 2018}} [1][2][3][4]2. ^1 {{cite web |title = List Of Apollo Minor Planets (by designation) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/lists/t_apollos.html |accessdate = 27 February 2018}} 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 = 27 February 2018}} 4. ^1 2 3 {{cite web |title = Asteroid Size Estimator |publisher = CNEOS NASA/JPL |url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html |accessdate = 12 November 2017}} }} External links
(inside the orbit of the Moon)|years=2 January 2101}}{{s-aft|after={{mpl|2007 UW|1}}}}{{end}}{{Minor planets navigator | |number=456938 | |PageName={{mp|(456938) 2007 YV|56}} }}{{Small Solar System bodies}}{{DEFAULTSORT:456938}} 4 : Apollo asteroids|Discoveries by CSS|Potentially hazardous asteroids|Astronomical objects discovered in 2007 |
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