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11 relations: Apparent magnitude, Ara (constellation), Constellation, Durchmusterung, Epoch (astronomy), Hipparcos, International Celestial Reference System, RR Lyrae variable, Star, Stellar classification, Variable star designation.
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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Ara (constellation)
Ara (Latin: "The Altar") is a southern constellation situated between Scorpius and Triangulum Australe.
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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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Durchmusterung
In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.
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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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Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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International Celestial Reference System
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
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RR Lyrae variable
RR Lyrae variables are periodic variable stars, commonly found in globular clusters.
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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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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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Variable star designation
Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.
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CD -49 11833, CD −49 11833, CD-49 11833, CD−49 11833, CPD -49 10361, CPD −49 10361, CPD-49 10361, CPD−49 10361, HIP 88064, S Ara.
