ASTR 1102 Midterm: Astro1102exam1 (got 94% in the course)

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24 Jun 2014
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Degrees- basic unit of angle measurement, designated by the symbol (cid:176) A full circle is divided into 360(cid:176) and a right angle measures 90(cid:176) . arc minutes-one-sixtieth of a degree (1/60), designated by the symbol . Also called minutes of arc. arc seconds- one-sixtieth of an arc minute, or 1/3600 of a degree, designated by the symbol . D=linear size of object d= distance to the object a=angular size of the object, in arcsec. Example: on december 11, 2006, jupiter was 944 million kilometers from earth and had an angular diameter of 31. 2 arcsec. From this info, calculate the actual diameter of jupiter in kilometers. D= 31. 2 x 944,000,000 km / 206,265 = 143,000 km. Exponent- a number placed above and after another number to denote the power to which the latter is to be raised, as 2 in 10 . It helps astronomers to avoid confusing terms such as a million billion billion .

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