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14 relations: Comoving and proper distances, Constellation, Epoch (astronomy), Fourth Cambridge Survey, Giga-, Light-year, Luminosity distance, Lyon-Meudon Extragalactic Database, Parsec, Pisces (constellation), Quasar, Seyfert galaxy, Third Cambridge Catalogue of Radio Sources, Wide Field and Planetary Camera 2.
Comoving and proper distances
In standard cosmology, comoving distance and proper distance are two closely related distance measures used by cosmologists to define distances between 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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Fourth Cambridge Survey
The Fourth Cambridge Survey (4C) is an astronomical catalogue of celestial radio sources as measured at 178 MHz using the 4C Array.
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Giga-
Giga is a unit prefix in the metric system denoting a factor of a (short-form) billion (109 or 000).
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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 distance
Luminosity distance DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.
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Lyon-Meudon Extragalactic Database
The Lyon-Meudon Extragalactic Database (LEDA) was a database of galaxies, created in 1983 at the Lyon Observatory.
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Parsec
The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
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Pisces (constellation)
Pisces is a constellation of the zodiac.
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Quasar
A quasar (also known as a QSO or quasi-stellar object) is an extremely luminous active galactic nucleus (AGN).
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Seyfert galaxy
Seyfert galaxies are one of the two largest groups of active galaxies, along with quasars.
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Third Cambridge Catalogue of Radio Sources
The Third Cambridge Catalogue of Radio Sources (3C) is an astronomical catalogue of celestial radio sources detected originally at 159 MHz, and subsequently at 178 MHz.
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Wide Field and Planetary Camera 2
The Wide Field and Planetary Camera 2 (WFPC2) is a camera formerly installed on the Hubble Space Telescope.
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