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7 relations: BY Draconis variable, Epoch (astronomy), Flare star, Light-year, Orion (constellation), Stellar classification, The Astrophysical Journal.
BY Draconis variable
BY Draconis variables are variable stars of late spectral types, usually K or M, and typically belong to the main sequence.
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Epoch (astronomy)
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Flare star
A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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Orion (constellation)
Orion is a prominent constellation located on the celestial equator and visible throughout the world.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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The Astrophysical Journal
The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.
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GJ 213, Gliese 213, V1352 Orionis.
