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19 relations: Absolute magnitude, Apparent magnitude, Binoculars, Charles Messier, Constellation, Epoch (astronomy), Globular cluster, Light-year, Luminosity, NGC 6366, Nova, Ophiuchus, Photographic plate, Star, Sun, Telescope, Variable star, W Virginis variable, 2MASS.
Absolute magnitude
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
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Apparent magnitude
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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Binoculars
Binoculars or field glasses are two telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
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Charles Messier
Charles Messier (26 June 1730 – 12 April 1817) was a French astronomer most notable for publishing an astronomical catalogue consisting of nebulae and star clusters that came to be known as the 110 "Messier objects".
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Constellation
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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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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Globular cluster
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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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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Luminosity
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
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NGC 6366
NGC 6366 is a globular cluster located in the constellation Ophiuchus.
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Nova
A nova (plural novae or novas) or classical nova (CN, plural CNe) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star, that slowly fades over several weeks or many months.
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Ophiuchus
Ophiuchus is a large constellation straddling the celestial equator.
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Photographic plate
Photographic plates preceded photographic film as a capture medium in photography.
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Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Sun
The Sun is the star at the center of the Solar System.
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Telescope
A telescope is an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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W Virginis variable
W Virginis variables are a subclass of Type II Cepheids which exhibit pulsation periods between 10–20 days,Wallerstein, G.,, Publications of the Astronomical Society of the Pacific, 114 p.689–699 (2002) and are of spectral class F6 – K2.
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2MASS
The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.
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Globular Cluster M14, M14 (galaxy), Messier Object 14, NGC 6402.
