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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.
Name Coordinates Distance Diameter Data Notes Local Void: 18 h 38 m +18° : cz=2500 km/s : 60 Mpc [1]Northern Local Supervoid: 61 Mpc 104 Mpc Virgo Supercluster, Coma Supercluster, Perseus–Pisces Supercluster, Ursa Major–Lynx Supercluster, Hydra–Centaurus Supercluster, Sculptor Supercluster, Pavo–Corona Australes Supercluster form a sheet between the Northern Local Supervoid and the ...
Epsilon Boötis (ε Boötis, abbreviated Epsilon Boo, ε Boo), officially named Izar (/ ˈ aɪ z ɑːr / EYE-zar), [16] is a binary star in the northern constellation of Boötes.The star system can be viewed with the unaided eye at night, but resolving the pair with a small telescope is challenging; an aperture of 76 mm (3.0 in) or greater is required.
Tau Boötis B (with a capital B, as opposed to the planet) is a dim, 11 mag red dwarf with only about half the mass and radius of the Sun. It orbits the primary star at an average distance of about 220 AU (14 arcseconds ) but comes as close as about 28 AU to the primary, giving its orbit a very high eccentricity of about 0.87.
Discovered in 2007, HAT-P-4 b has a mass of 0.68 M J and a radius of 1.27 R J. It orbits every 3.05 days at a distance of 0.04 AU. HAT-P-4, the host star, is an F-type star of magnitude 11.2, 310 parsecs from Earth. It is larger than the Sun, with a mass of 1.26 M ☉ and a radius of 1.59 R ☉. [59] Evolution of the HD 128311 system over time
Gamma Boötis, Latinised from γ Boötis, is a binary star [12] system in the northern constellation of Boötes the herdsman, forming the left shoulder of this asterism. [13] The primary component has the proper name Seginus / s ɪ ˈ dʒ aɪ n ə s / [citation needed], the traditional name of the Gamma Bootis system. [14]
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A light curve for Xi Bootis, showing the average of the b and y magnitudes as a function of time. Adapted from Lockwood et al. (2007) [11]. The primary star in this system is a BY Draconis variable with an apparent magnitude that varies from +4.52 to +4.67 with a period just over 10 days long, and is classified as a G-type main-sequence star.