|
The Ismenius Lacus quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The quadrangle is located in the northwestern portion of Mars’ eastern hemisphere and covers 0° to 60° east longitude (300° to 360° west longitude) and 30° to 65° north latitude. The quadrangle uses a Lambert conformal conic projection at a nominal scale of 1:5,000,000 (1:5M). The Ismenius Lacus quadrangle is also referred to as MC-5 (Mars Chart-5).〔Davies, M.E.; Batson, R.M.; Wu, S.S.C. "Geodesy and Cartography" in Kieffer, H.H.; Jakosky, B.M.; Snyder, C.W.; Matthews, M.S., Eds. ''Mars.'' University of Arizona Press: Tucson, 1992.〕 The southern and northern borders of the Ismenius Lacus quadrangle are approximately and wide, respectively. The north to south distance is about (slightly less than the length of Greenland).〔Distances calculated using NASA World Wind measuring tool. http://worldwind.arc.nasa.gov/.〕 The quadrangle covers an approximate area of 4.9 million square km, or a little over 3% of Mars’ surface area.〔Approximated by integrating latitudinal strips with area of R^2 (L1-L2)(cos(A)dA) from 30° to 65° latitude; where R = 3889 km, A is latitude, and angles expressed in radians. See: http://stackoverflow.com/questions/1340223/calculating-area-enclosed-by-arbitrary-polygon-on-earths-surface.〕 The Ismenius Lacus quadrangle contains parts of Acidalia Planitia, Arabia Terra, Vastitas Borealis, and Terra Sabaea.〔http://planetarynames.wr.usgs.gov/SearchResults?target=MARS&featureType=Terra,%20terrae〕 The Ismenius Lacus quadrangle contains Deuteronilus Mensae and Protonilus Mensae, two places that are of special interest to scientists. They contain evidence of present and past glacial activity. They also have a landscape unique to Mars, called Fretted terrain. The largest crater in the area is Lyot Crater which contains channels probably carved by liquid water.〔J. Carter, F. Poulet, J.-P. Bibring, and S. Murchie. Detection of Hydrated Silicates in Crustal Outcrops in the Northern Plains of Mars. Science, 2010; 328 (5986): 1682-1686〕 〔http://www.jpl.nasa.gov/news.cfm?release=2010-209〕 ==Origin of Name== Ismenius Lacus is the name of a telescopic albedo feature located at 40° N and 30° E on Mars. The term is Latin for Ismenian Lake. Ismenia is the poetic name for Thebes, a city in Greece. The name was approved by the International Astronomical Union (IAU) in 1958.〔USGS Gazetteer of Planetary Nomenclature. Mars. http://planetarynames.wr.usgs.gov/.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ismenius Lacus quadrangle」の詳細全文を読む スポンサード リンク
|