The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
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Cepheus is a constellation in the northern sky.
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The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
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Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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This is the list of notable stars in the constellation Cepheus, sorted by decreasing brightness.
In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness.
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Seth Carlo Chandler, Jr. (September 16, 1846 – December 31, 1913) was an American astronomer.
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A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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