12 relations: Apparent magnitude, Ara (constellation), Constellation, Durchmusterung, Epoch (astronomy), Hipparcos, International Celestial Reference System, RR Lyrae variable, SIMBAD, Star, Stellar classification, Variable star designation.
The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
New!!: S Arae and Apparent magnitude ·
Ara is a southern constellation situated between Scorpius and Triangulum Australe.
New!!: S Arae and Ara (constellation) ·
In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
New!!: S Arae and Constellation ·
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.
New!!: S Arae and Durchmusterung ·
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.
New!!: S Arae and Epoch (astronomy) ·
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
New!!: S Arae and Hipparcos ·
The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).
RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances.
New!!: S Arae and RR Lyrae variable ·
SIMBAD (the Set of Identifications, Measurements, and Bibliography for Astronomical Data) is an astronomical database of objects beyond the Solar System.
New!!: S Arae and SIMBAD ·
A star is a luminous sphere of plasma held together by its own gravity.
New!!: S Arae and Star ·
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
New!!: S Arae and Stellar classification ·
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.
New!!: S Arae and Variable star designation ·