| 词条 | 2685 Masursky |
| 释义 |
| minorplanet = yes | name = 2685 Masursky | background = #D6D6D6 | image = Asteroid 2685Masurky.png | image_size = 250 | caption = Masursky imaged by Cassini–Huygens in January 2000 | discovery_ref = [1] | discoverer = E. Bowell | discovery_site = Anderson Mesa Stn. | discovered = 3 May 1981 | mpc_name = (2685) Masursky | alt_names = 1981 JN{{·}}1950 VO 1973 QF{{·}}{{mp|1975 XJ|5}} 1977 KU | pronounced = | named_after = Harold Masursky [1] {{nowrap|{{small|(American planetary geologist)}}}} | mp_category = main-belt [1]{{·}}{{small|(middle)}} Eunomia [5] | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 44.58 yr (16,282 d) | aphelion = 2.8522 AU | perihelion = 2.2874 AU | semimajor = 2.5698 AU | eccentricity = 0.1099 | period = 4.12 yr (1,505 d) | mean_anomaly = 54.965° | mean_motion = {{Deg2DMS|0.2393|sup=ms}} / day | inclination = 12.129° | asc_node = 215.36° | arg_peri = 288.47° | mean_diameter = {{val|10.744|0.170|ul=km}}[7] | rotation = | albedo = {{val|0.114|0.034}}[8] | spectral_type = S [9] | abs_magnitude = 12.1 }}2685 Masursky, provisional designation {{mp|1981 JN}}, is a stony Eunomian asteroid from the central regions of the asteroid belt, approximately {{convert|11|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 3 May 1981, by American astronomer Edward Bowell at the Anderson Mesa Station near Flagstaff, Arizona, and named after American planetary geologist Harold Masursky.[1] In January 2000, the Cassini space probe observed the S-type asteroid from afar during its coast to Saturn.[12] Orbit and classificationMasursky is a member of the Eunomia family ({{small|502}}),[5] a prominent family of stony asteroids and the largest one in the intermediate main belt with more than 5,000 members.[14]It orbits the Sun in the central main-belt at a distance of 2.3–2.9 AU once every 4 years and 1 month (1,505 days; semi-major axis of 2.57 AU). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic. The asteroid was first observed as {{mp|1950 VO}} at McDonald Observatory in November 1950. The body's observation arc begins with its observation as {{mp|1973 QF}} at Cerro El Roble Observatory in August 1973, nearly 8 years prior to its official discovery observation at Anderson Mesa.[1] Cassini–Huygens flybyLittle was known about Masursky until the Cassini–Huygens space probe, en route to Jupiter and Saturn, flew past it on 23 January 2000. Because Cassini passed the asteroid at a distance of 1.6 million kilometers (approximately 4 lunar distances), the images it returned showed nothing more than a dot.[12] Physical characteristicsCassini's observations had cast some doubt on its composition,[12] but later ground-based spectroscopy has confirmed its stony S-type spectrum,[9] which is also the Eunomia family's overall spectral type.[14]{{rp|23}} Diameter and albedoDuring its flyby in January 2000, Cassini–Huygens estimated a mean-diameter of approximately 15–20 kilometers, based on an angular diameter of 0.81–1.08 arcseconds just hours before its closest approach.[12] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Masursky measures 10.744 kilometers in diameter and its surface has an albedo of 0.114.[7][8] Rotation periodAs of 2018, no rotational lightcurve of Masursky has been obtained from photometric observations. The body's rotation period, spin-axis and shape remain unknown. NamingThis minor planet was named after Harold Masursky (1923–1990), a planetary geologist at the USGS Astrogeology Science Center of the U.S. Geological Survey, in Flagstaff, Arizona. Masursky worked on numerous space missions and programs including Ranger, Surveyor, Lunar Orbiter, Apollo, Mariner 9, Viking, Pioneer Venus, Voyager, as well as on the Galileo and Magellan spacecrafts.[1] The official naming citation was published by the Minor Planet Center on 4 August 1982 ({{small|M.P.C. 7158}}).[26] References1. ^1 2 3 4 5 6 {{cite web |title = 2685 Masursky (1981 JN) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2685 |accessdate = 7 April 2018}} [1][2][3][4][5][6][7][8]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 = 7 April 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 = 7 April 2018}} 4. ^1 2 {{Cite book |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |title = Identification and Dynamical Properties of Asteroid Families |journal = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |isbn = 9780816532131 }} 5. ^1 2 {{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 }} 6. ^1 2 {{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 = C. |last6 = Nugent |first7 = M. S. |last7 = Cabrera |date = November 2012 |title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids |journal = The Astrophysical Journal Letters |volume = 759 |issue = 1 |page = 5 |bibcode = 2012ApJ...759L...8M |doi = 10.1088/2041-8205/759/1/L8 |arxiv = 1209.5794 }} 7. ^1 2 {{Cite journal |display-authors = 6 |first1 = Daniela |last1 = Lazzaro |first2 = Thaís. |last2 = Mothé-Diniz |first3 = Jorge M. |last3 = Carvano |first4 = Cláudia A. |last4 = Angeli |first5 = Alberto S. |last5 = Betzler |first6 = Marcos |last6 = Florczak |first7 = Alberto |last7 = Cellino |first8 = Mario |last8 = Di Martino |first9 = Alain |last9 = Doressoundiram |first10 = Maria A. |last10 = Barucci |first11 = Elisabetta |last11 = Dotto |first12 = Philippe |last12 = Bendjoya |date = December 1999 |title = The Eunomia Family: A Visible Spectroscopic Survey |url = https://www.sciencedirect.com/science/article/pii/S0019103599962139 |journal = Icarus |volume = 142 |issue = 2 |pages = 445–453 |bibcode = 1999Icar..142..445L |doi = 10.1006/icar.1999.6213 |access-date= 7 April 2018}} 8. ^1 2 3 4 {{cite web |title = PIA02449: Masursky |publisher = NASA/JPL – Photojournal |date = 11 February 2000 |url = https://photojournal.jpl.nasa.gov/catalog/PIA02449 |access-date= 7 April 2018}} }} External links
7 : Eunomia asteroids|Discoveries by Edward L. G. Bowell|Minor planets named for people|Named minor planets|S-type asteroids|Minor planets visited by spacecraft|Astronomical objects discovered in 1981 |
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