12 relations: Bright Star Catalogue, Camelopardalis, Declination, Durchmusterung, Henry Draper Catalogue, Hipparcos, Right ascension, Smithsonian Astrophysical Observatory Star Catalog, Star, Sun, Variable star, Year.
The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.
New!!: HD 21447 and Bright Star Catalogue ·
Camelopardalis or the Giraffe constellation is a large, faint grouping of stars in the northern sky.
New!!: HD 21447 and Camelopardalis ·
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
New!!: HD 21447 and Declination ·
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!!: HD 21447 and Durchmusterung ·
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
New!!: HD 21447 and Henry Draper Catalogue ·
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
New!!: HD 21447 and Hipparcos ·
Right ascension (abbreviated RA; symbol α) is the angular distance measured eastward along the celestial equator from the vernal equinox to the hour circle of the point in question.
New!!: HD 21447 and Right ascension ·
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
A star is a luminous sphere of plasma held together by its own gravity.
New!!: HD 21447 and Star ·
The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.
New!!: HD 21447 and Sun ·
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
New!!: HD 21447 and Variable star ·
A year is the orbital period of the Earth moving in its orbit around the Sun.
New!!: HD 21447 and Year ·