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John Flamsteed numbered 54 stars for the constellation. [22] Located 36.7 light-years from Earth, Arcturus, or Alpha Boötis, is the brightest star in Boötes and the fourth-brightest star in the sky at an apparent magnitude of −0.05; [23] It is also the brightest star north of the celestial equator, just shading out Vega and Capella.
A map of the Boötes Void. The Boötes Void (/ b oʊ ˈ oʊ t iː z / boh-OH-teez) (colloquially referred to as the Great Nothing) [1] is an approximately spherical region of space found in the vicinity of the constellation Boötes, containing only 60 galaxies instead of the 2,000 that should be expected from an area this large, hence its name.
η Boötis, or Muphrid, is only 3.3 light-years distant from Arcturus, and would have a visual magnitude −2.5, about as bright as Jupiter at its brightest from Earth, whereas an observer on the former system would find Arcturus with a magnitude -5.0, slightly brighter than Venus as seen from Earth, but with an orangish color. [15]
The location of NGC 5466 (circled in red) NGC 5466 imaged with a 32-inch telescope NGC 5466 is a class XII globular cluster in the constellation Boötes.Located 51,800 light years from Earth and 52,800 light years from the Galactic Center, it was discovered by William Herschel on May 17, 1784, as H VI.9.
Delta Boötis, Latinized from δ Boötis, is a double star in the northern constellation of Boötes, forming the easternmost member of the constellation's kite-shaped asterism of brighter stars. [14] Based upon parallax measurements, it is located at a distance of approximately 120.5 light-years (36.9 parsecs) from the Earth. [1]
This distant star has an estimated orbital period of three million years, being at an observed distance of 41,300 au (6,180 × 10 ^ 9 km; 0.653 ly) from the inner pair. [ 8 ] In 1976, T. W. Edwards found a stellar classification of A2III for both components, suggesting they may be evolved A-type giant stars .
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Xi Boötis, Latinised from ξ Boötis, is a binary star [10] system located at a distance of 22 light-years away from Earth. It is the nearest visible star in the constellation Boötes . The brighter, primary component of the pair has a visual magnitude of 4.70, making it visible to the naked eye.