![]() To study stars, the stars are made brighter by allowing more light to enter the telescopes by using different designs. Thus, the distance of stars are so large in comparison to planets that stars cannot be magnified on earth while planets can be. Therefore, after magnification mars appears to be 30 arc minutes which is more than 1 arc minute and hence is not influenced by atmospheric fluctuations and is magnified. With the telescope used in the previous problem, the sun appears to be in diameter, therefore for mars, To find the size of mars as seen from earth, we first place mars at distance equal to the earth-sun distance form earth i.e. Let D e, D ma and D s be the diameters of earth, mars and the sun. Ratio between mar’s diameter and earth’s diameter = Since due to atmospheric fluctuations, the eye cannot resolve below 1 arc minute, the sun like star appears to be 1 arc minute in angular diameter. Distance in the metric sense is a measure between any two A to Z points. ![]() Convert length of parsec (pc) and astronomical units (au - ua) units in reverse from astronomical units into parsecs. When seen from the telescope, the star will be 100 times magnified and therefore,Ĭonverting to arc minutes the angular diameter will be 7.25 x 10 -5 arc minutes. Conversion chart - parsecs to astronomical units Category: main menu length menu Parsecs. then for 2 parsecs or as calculated in (a) from 2 x 2.06 x 10 5 A.U. Thus if sun appears to be in diameter from earth at 1 A.U. The size of the star as seen from the earth can be considered by placing the sun at the same distance from earth as the star since it is sun like. Minimum resolution eye due to atmosphere = 1’ Astronomical units are used to describe distances on the scale of planets and solar systems. Here L = 1 A.U., θ = 1s and r = 1 parsec. The angle subtended by an arc of length L and radius r is given as: ![]() (a) Parsec is defined as the distance at which 1 A.U.
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