Arcturus
From LoveToKnow 1911
ARCTURUS, the brightest star in the northern hemisphere, situated in the constellation Bootes in an almost direct line with the tail Q' and rt) of the constellation Ursa Major (Great Bear); ...
Arcturus
Arcturus is the brightest star in the constellation Bootes, and the fourth brightest star in the night sky, with a visual magnitude of -0.05, after Sirius, Canopus and Alpha Centauri.
Arcturus
Related Category: Astronomy: Stars
(ärktr´s), brightest star in the constellation Boötes and 4th-brightest star in the entire sky; Bayer designation Alpha Boötis; 1992 position R.A. 14h15.3m, Dec. +19°13&minut;.
Arcturus (Alpha Bootis)
Photo: ESO
The brightest star in the constellation Boötes and in the entire northern hemisphere, and the fourth brightest in the sky; its Greek name means the "Bear Watcher, ...
Arcturus (α Boo / α Boötis / Alpha Boötis) is the brightest star in the constellation Boötes, and the third brightest star in the night sky, with a visual magnitude of −0.05, after Sirius and Canopus.
Arcturus
Andrea Dupree, Ronald Gilliland, NASA and ESA
(Larger ultraviolet image -- more).
ARCTURUS (Alpha Bootis). Among the very brightest of stars, shining with a soft orange light, Arcturus lights northern spring skies.
Arcturus, Ghost of Summer Sun
A star often mistaken for a planet, scintillating Arcturus at this time of year hovers over the northwestern horizon at evening dusk, and over the northeastern horizon in the morning dawn.
Arcturus is the 4th brightest star in the sky. Take a look at the list of the Brightest Stars ...
"Arcturus" is a Greek word meaning "Bear Guard." This name for the star is undoubtedly connected with it's position just to the east of the Ursa Major, The Greater Bear.
Arcturus an orange giant star about 36 light years away is the fourth brightest star in the sky. This includes the Sun. However, the combined light of the alpha centauri stars is brighter.
Arcturus was the first star proven to move - its proper motion (almost 2.3 arcsec/year) was discovered by Halley in 1718.
List of Constellations
Spring Sky ...
ARCTURUS - In 1964 Britain and France agree to build the Channel tunnel, the Beatles have hits with She Loves You and A Hard Day's Night and Radio Caroline begins transmission. The author of this web site is born.
Arcturus
( Boo) (a) A beautiful orange star that is the brightest in the constellation Bootes and the fourth brightest in the night sky. It lies 34 light-years away and is a member of the thick-disk population.
ARCTURUS (Alpha Boo)
Nekkar (Beta Boo)
Seginus (Gamma Boo)
IZAR (Epsilon Boo)
Mufrid (Eta Boo)
Asellus Primus (Theta Boo)
Asellus Secondus (Iota Boo)
Asellus Tertius (Kappa 2 Boo)
Alkalurops (Mu 1 Boo)
Merga (38 Boo) ...
Arcturus is a bright red supergiant star with a diameter nearly 20 times that of the Sun and a brightness more than 100 times that of our Sun.
Arcturus (Alpha Boötis or Hokule'a)
Izar (Epsilon Boötis)
Caelum (Caeli) Camelopardalis (Camelopardalis) Cancer (Cancri)
NGC 2812
Canes Venatici (Canum Venaticorum) ...
see Arcturus. [H76]
Bootis Stars
A type of young (usually early A), weak-lined, metal-poor stars with low radial velocities. [H76]
Bootstrapping ...
"Arc to Arcturus then spike to Spica" (keep following the arc from the Big Dipper's handle past Arcturus). A blue main sequence star, just below the ecliptic. It is also an eclipsing binary.
Aldebaran (K5), Arcturus (K2)
M
Ti oxide molecular lines; neutral metal lines strong; molecular lines moderate; H lines very faint
K = 2,000-3,500; M = 0.08-0.65; R = 0.17-0.63; L = 0.001-0.08; T = 56 Ga ...
One day, her son Arcturus came upon her. She recognized him, and advanced toward him in what she thought was a friendly, even motherly, fashion. But Arcturus saw only a great bear approaching. Not knowing it was his mother, he tried to spear it.
Alpha Star And Andromeda Andromeda Alpheratz (Sirrah) Ant Antlia Air Pumpe Aps Apus Bird of Paradise Aqr Aquarius Water Carrier Aql Aquila Eagle Altair Ara Ara Altar Ari Aries Ram Hamal Aur Auriga Charioteer Capella Boo Bootes Bear Driver Arcturus ...
In 150 AD, the astronomer Ptolemy described Sirius as reddish, along with five other stars, Betelgeuse, Antares, Aldebaran, Arcturus and Pollux, all of which are clearly of orange or red hue.
Bootes is home to [876] Arcturus or alpha Bootis, the third brightest star in the sky. Arcturus is a red giant 36.7 light-years distant and about 110 times more luminous than the Sun.
In early mid-northern winter evenings, Capella shines almost directly overhead, and is one of the three bright stars spread around the northern sky, the others Arcturus of spring and Vega of summer.
To find the major star, Arcturus, follow the sweep of the Big Dipper's handle. These stars lead to the brightest star in the northern hemisphere, and the fourth brightest in all of the heavens: alpha Boötis, better known as Arcturus.
Boötes contains the fourth-brightest star in the entire sky, Arcturus, mentioned by Homer, Hesiod and Ptolemy. Its name means ‘bear guard' in Greek.
This rainbow of colors is actually a powerful astronomical tool: the spectrum of the star Arcturus. Astronomers created the image by splitting the star's light into its individual wavelength or colors.
Hesiod, who wrote in the early 7th century BCE, adds the star Arcturus to this list in his poetic calendar Works and Days.
Here, in this spectrum of the star Arcturus, we can see many such lines in the yellow region alone. The tracing below records precise details about these lines that would be difficult or impossible to obtain just by looking at the spectrum.
In 1718 in Philosophical Transactions Edmond Halley noted that the bright stars Sirius, Aldebaran and Arcturus had changed their positions relative to other stars since antiquity.
This is a detailed spectrum of the star Arcturus - a red giant. It was taken from an American Observatory and shows a continuous spectrum displayed over 50 strips.
Alkalurops (μ1 Boo), Arcturus (α Boo), Asellus primus (θ Boo, not visible), Haris (or Seginus, γ Boo), Hemelein Prima (σ Boo), Izar (Pulcherrima, ε Boo), Muphrid (η Boo), Nekkar (Meres, β Boo).
BOÖTES
Boötes (the herdsman) is a large constellation in the Northern Hemisphere. The brightest star in Boötes is Arcturus, a red giant that is the fourth brightest star in the sky.
...
However, in addition to all of these identifiers, some of the brighter stars have proper names as well; names like Arcturus or Polaris or Rigel or Sirius or Vega.
comprises stars having strong calcium lines and lines indicating the presence of other metals. The violet light of the spectrum is less intense, compared with the red light, than in the classes previously mentioned. The group is typified by Arcturus.
Vega is the brightest star in the constellation Lyra, the list of brightest stars in the night sky and the second brightest star in the northern Celestial sphere, after Arcturus....
(the female weaver maid deity) in the constellation Lyra
Lyra ...
In 1710 he discovered discrepancies with his own observations and Ptolemy's catalog, and deducted that the stars might move around on their own. Later he managed to measure the movement, the proper motion, of Aldebaran, Arcturus and Sirius.
It will puff up until its radius is 30 times greater becoming a red giant, similar to the star Arcturus, though much smaller than a supergiant such as Betelguese in the constellation Orion.
In the early 1900's, infrared radiation was successfully detected from the planets Jupiter and Saturn and from some bright stars such as Vega and Arcturus.
In other stories Bootes is known as the bear-driver as he is following the two bears of Ursa Major and Ursa Minor around the sky. Bootes is easily found by following the arc of the handle of the Big Dipper to the bright star Arcturus (the third ...
In this phase, the luminosity is approximately 100 times what it was during the main part of its life, the radius between 30-100 times, and the effective temperature will be approximately 60%. Examples of this are Arcturus and Aldebaran.
measured in seconds of arc per year; the largest known is that of Barnard's star in the constellation Ophiuchus, about 10" yearly. The English astronomer Edmond Halley, in 1718, was the first to detect proper motions--those of Aldebaran, Arcturus, ...
Arcturus Alpha Bootis
Arich Gamma Virginis
Arided Alpha Cygni
Arkab Beta Sagittarii
Arkab Prior Beta-1 Sagittarii
Arkab Posterior Beta-2 Sagittarii
Arm Eta Capricorni
Arneb Alpha Leporis
Arrakis Mu Draconis
Ascella Zeta Sagittarii ...
 See also: Star, Constellation, Sun, Light, Sky
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