NATS 1570 Lecture Notes - Lecture 2: Apparent Magnitude, Solar Luminosity, Molecular Cloud
14 Apr 2018
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Earth is about 150 million km from the sun. , and the apparent brightness of the sun in our sky is about 1,300 watts per square meter. Determine the apparent brightness we would measure for the. Sun if we were located half earth"s distance from the sun. Answer: the sun would appear four times brighter. Determine the apparent brightness we would measure for the sun if we were located one-third of earth"s distance from the sun. Answer: the sun would appear nine times brighter. Determine the apparent brightness we would measure for the sun if we were located five times earth"s distance from the sun. Answer: the sun would appear 1/25 times as bright. Answer: a star with absolute magnitude -6 is intrinsically more luminous than a star with magnitude +4. Tom is luminosity class v and jerry is luminosity class i. Answer: tom is on the main sequence, while jerry is a supergiant.
