Monday 09 April 2018 - 22:55:05 Posted by  Bobby

 Mythology of Bootes

Bootes is an elongated constellation depicting a man herding a bear, represented by Ursa Major. The name of its brightest star, Arcturus, is Greek for (bear guard). The northern part of Bootes contains the faint stars that formed the now-defunct constellation of Quardrans Muralis, the mural (or wall) quadrant, which gave its name to the Quadrantid meteor shower that radiates from this area every January.

The Facts

  • Depiction: The Herdsman
  • Pronounced: bo-OH-teez
  • Genitive: Bootis
  • Abbreviation: Boo
  • Highest in the Sky: May to June
  • Size Ranking: 13th
  • Coverage Area: 907 Sq. Degrees
  • Right Acension: 15 Hours
  • Declination: 30°
  • Visibility: 90°N to 45°S

 Notable Objects/Stars

  • NGC 5248: Spiral galaxy
  • NGC 5466: Globular cluster
  • NGC 5557: Elliptical galaxy
  • NGC 5676: Spiral galaxy

 Named Stars

  • Arcturus, Alpha Bootis
  • Nekkar, Beta Bootis
  • Haris, Gamma Bootis
  • Izar, Epsilon Bootis
  • Mufrid, Eta Bootis
  • Asellus Primus, Theta Bootis
  • Asellus Secundus, Iota Bootis
  • Asellus Tertius, Kappa Bootis
  • Alkalurpos, Mu Bootis
  • Merga, 38 Bootis

 Best Viewed Objects/Stars

Alpha Bootis (Arcturus)

The brightest star north of the celestial equator, and, at magnitude -0.1, the fourth brightest overall. It is a red giant, 100 times more luminous than our Sun but with a cooler (and hence redder) surface. To the naked eye, it has a noticeably warm tint, which becomes stronger when it is viewed with binoculars.

Epsilon Bootis

 A beautiful double star but a difficult one to divide. To the naked eye, it appears of magnitude 2.4. A telescope of aperture 3 in (75 mm) or more shows a redgiant primary and a close, blue-green partner of 5th magnitude. High magnification and a steady night are needed to separate the stars.

Kappa Bootis

 A double star, easily divided with a small telescope into a pair of white stars of 5th and 7th magnitudes.

Mu Bootis

 A multiple star. Binoculars show a wide double, with stars of magnitudes 4.3 and 6.5. The fainter star is itself double, with 7th- and 8th-magnitude components that orbit each other every 260 years. They should be divisible in moderate apertures, but are just too close to be split with a small telescope.

Xi Bootis

 A double star, divisible with a small telescope. The stars, of magnitudes 4.7 and 7.0, are both yellow-orange, one slightly deeper in tone than the other. They form a true binary with an orbital period of 152 years.


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