Absolute magnitude is the measure of intrinsic brightness of a celestial object.
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Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces.
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
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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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The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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