The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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The Centre de Données astronomiques de Strasbourg (CDS; English translation: Strasbourg Astronomical Data Center) is a data hub which collects and distributes astronomical information.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Hydrogen is a chemical element with symbol H and atomic number 1.
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Perseus is a constellation in the northern sky, being named after the Greek mythological hero Perseus.
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A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
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A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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