AST 104 Study Guide - Quiz Guide: Parsec, Minute And Second Of Arc, Proper Motion
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If a star is 10 parsecs away, how long ago did the light we see from it tonight begin its journey toward us? a. Its absolute magnitude must be: 0 b. If we were 1 parsec away, what would its apparent magnitude be? less than 4. 83 a: equal to 4. 83, greater than 4. 83, the star pollux in the constellation gemini exhibits a parallax angle of just about 0. 1 arcsec. How far away is pollux: 0. 1 parsec, 1 parsec, 2 parsec, 10 parsec, 20 parsec, the star pollux in the constellation gemini is of spectral class k0. How does its temperature compare to that of the sun: pollux is hotter, pollux is the same temperature, pollux is cooler, suppose we measure a star"s apparent brightness (or apparent magnitude) and its distance. What property can we infer from those two measurements: elemental composition, temperature, size, luminosity, suppose we determine a star"s luminosity and its temperature.
