36,800
edits
Canes Venatici: Difference between revisions
no edit summary
No edit summary |
No edit summary |
||
| Line 4: | Line 4: | ||
The stars of Canes Venatici are not bright. In classical times, they were included byPtolemy within the constellation Ursa Major in his star catalogue. α CVn was Ptolemy's "28th of Ursa Major", and β CVn was his "29th of Ursa Major". In medieval times, the identification of these stars with the dogs of Boötes arose through a mistranslation. Some of Boötes's stars were traditionally described as representing the club (Greek, Κολλοροβος) of Boötes. | The stars of Canes Venatici are not bright. In classical times, they were included byPtolemy within the constellation Ursa Major in his star catalogue. α CVn was Ptolemy's "28th of Ursa Major", and β CVn was his "29th of Ursa Major". In medieval times, the identification of these stars with the dogs of Boötes arose through a mistranslation. Some of Boötes's stars were traditionally described as representing the club (Greek, Κολλοροβος) of Boötes. | ||
[[Canes Venatici]] is bordered by Ursa Major to the north and west, Coma Berenices to the south, and Boötes to the east. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is 'CVn'. | [[Canes Venatici]] is bordered by Ursa Major to the north and west, Coma Berenices to the south, and Boötes to the east. The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is 'CVn'.The official constellation boundaries, as set by Eugène Delporte in 1930, are defined by a polygon of 14 sides. In theequatorial coordinate system, the right ascension coordinates of these borders lie between 12h 06.2m and 14h 07.3m, while the declination coordinates are between +27.84° and +52.36°. Covering 465 square degrees, it ranks 38th of the 88 constellations in size. | ||
Canes Venatici contains five Messier objects, including four galaxies. One of the more significant galaxies in Canes Venatici is the Whirlpool Galaxy ([[Messier 51]], NGC 5194) and NGC 5195, a small barred spiral galaxy that is seen face on. This was the first galaxy recognised as having a spiral structure, this structure being first observed by Lord Rosse in 1845.<ref>[http://en.wikipedia.org/wiki/Canes_Venatici Canes Venatici]</ref> | Canes Venatici contains five Messier objects, including four galaxies. One of the more significant galaxies in Canes Venatici is the Whirlpool Galaxy ([[Messier 51]], NGC 5194) and NGC 5195, a small barred spiral galaxy that is seen face on. This was the first galaxy recognised as having a spiral structure, this structure being first observed by Lord Rosse in 1845.<ref>[http://en.wikipedia.org/wiki/Canes_Venatici Canes Venatici]</ref> | ||