13 Boötis [SEP] constellation
13 Boötis
13 Boötis, also known by its variable star designation CF Boötis, is a variable star in the constellation Boötes. It is approximately 550 light-years from Earth, based on its parallax. 13 Boötis is a M-type red giant with a mean apparent magnitude of +5.26. It is classified as an irregular variable star and its brightness varies from magnitude +5.29 to +5.38.
Possible planetary system.
In 1991, Duquennoy & Mayor reported the possible presence of a low-mass object (of likely
Quadrans Muralis" and shrank the constellation a little in his 1801 "Uranographia" star atlas, to avoid it clashing with neighboring constellations.
In 1922, Quadrans Muralis was omitted when the International Astronomical Union (IAU) formalised its list of officially recognized constellations.
Notable features.
- The variable star BP Boötis was a member of the constellation.
- 39 Boötis is a double star that was transferred by Lalande into Quadrans.
- The Quadrantid meteor shower is still named after the obsolete constellation.