As one of the brightest stars in the sky, Arcturus has been significant to observers since antiquity.

Ptolemy described Arcturus as subrufa " slightly red ", and it has a B-V color index of + 1. 23, roughly midway between Pollux ( B-V + 1. 00 ) and Aldebaran ( B-V + 1. 54 ).

The French mathematician and astronomer Jean-Baptiste Morin observed Arcturus in the daytime with a telescope ( a first for any star other than the sun ) in 1635, and has been seen at or just before sunset with the naked eye.

This is not too uncommon in red giants, but Arcturus has a particularly strong case of the phenomenon.

As one of the brightest stars in the sky, Arcturus has been the subject of a number of studies in the emerging field of asteroseismology.

Arcturus has a much lower metallicity than our sun, and it is possibly a Population II star.

Arcturus is likely to be around a billion years old, and has likely begun fusing helium into oxygen and carbon in its core.

An alternative theory, which has gained only limited acceptance among professional scholars, derives the name Arthur from Arcturus, the brightest star in the constellation Boötes, near Ursa Major or the Great Bear.

* Sköll is the surname of the Norwegian bassist Hugh Steven James Mingway who has played in Ved Buens Ende, Arcturus ( band ) and Ulver.

Aside from Brun's lyrical contributions, the band has featured lyrics by other members as well: ICS Vortex from Arcturus and ex-Dimmu Borgir, drummer Asgeir Mickelson, keyboardist Lars Nedland and more recently by current singer Vintersorg from Otyg and his eponymous band.

Commander Arcturus Rann ( returning from a thousand-year deep space voyage in suspended animation ) and Biotron, his robot co-pilot, return on the HMS ( Homeworld Micro Ship ) Endeavor, to discover Karza has slain the royal family, who are in fact Rann's parents.

Arcturus has experimented throughout their career, extracting influences and incorporating elements from all over the musical spectrum including black metal and classical music, but the band was rooted as a metal outfit.

However, Arcturus has used a listening device to eavesdrop on the conversation.

A Voyage to Arcturus has been described as the major " underground " novel of the 20th century.

Harold Bloom has also taken an interest in Lindsay's life and career, going so far as to publish a novel, The Flight to Lucifer, which he thought of as a Bloomian misprision, an homage and deep revision of A Voyage to Arcturus.

Its name has no particular association with any specific star, although prominent red stars visible from the northern hemisphere include Aldebaran, Arcturus, Antares and Betelgeuse.

Stakar has knowledge of the archaeology of the planet Arcturus IV.

Aleta is a member of the alien race of the planet Arcturus IV who has merged into a composite being with her adoptive brother Stakar by an alien energy device.

Aleta has knowledge of the archaeology of the planet Arcturus IV.

This makes Arcturus the third brightest individual star, just ahead of Alpha Centauri A ( α Cen A ), whose visual magnitude is − 0. 01.

Eta Bootis, or Muphrid, is only 3. 3 light years distant from Arcturus, and would have a visual magnitude-2½, whereas an observer on the former system would find Arcturus as bright as Venus as seen from Earth.

Arcturus is notable for its high proper motion, larger than any first magnitude star in the stellar neighborhood other than α Centauri.

It is the brightest star in the constellation Auriga, the sixth brightest star in the night sky, the third brightest star in the northern celestial hemisphere ( after Arcturus and Vega ), and the fourth brightest star visible to the naked eye from the latitude 40 ° N. It is closer to the north celestial pole than any other first magnitude star ( Polaris is only second magnitude ).

Using this logarithmic scale, it is possible for a star to be brighter than “ first class ”, so Arcturus is magnitude 0, and Sirius is magnitude − 1. 46.

For example, Sirius is magnitude − 1. 46, Arcturus is − 0. 04, Aldebaran is 0. 85, Spica is 1. 04, and Procyon ( the little Dog ) is 0. 34.

With an apparent brightness of 0. 03m, this is the second brightest star of the northern hemisphere ( after Arcturus ) and the fifth brightest star in all ; its spectral class is A0 V and it lies at a distance of only 25. 3 ly.

Arcturus (; α Boo, α Boötis, Alpha Boötis ) is the brightest star in the constellation Boötes and in fact the northern celestial hemisphere.

Arcturus is the zenith star of the Hawaiian Islands.

Traveling east and north they eventually crossed the equator and reached the latitude at which Arcturus would appear directly overhead in the summer night sky.

According to the Hipparcos satellite, Arcturus is 36. 7 light years ( 11. 3 parsecs ) from Earth, relatively close in astronomical terms.

However, Alpha Centauri is a bright binary star, whose unresolved components to the naked eye are both fainter than Arcturus.

Arcturus is visible from both hemispheres in the sky, as it is located less than 20 degrees north of the celestial equator.

From the northern hemisphere, an easy way to find Arcturus is to follow the arc of the handle of the Big Dipper.

By continuing in this path, one can find Spica, " Arc to Arcturus, then spike to Spica.

Arcturus is a type K1. 5 IIIpe orange giant star — the letters " pe " stand for " peculiar emission ," which indicates that the spectrum of light given off by the star is unusual and full of emission lines.

In practice, the traditional names are only universally used for the very brightest stars ( Sirius, Arcturus, Vega, etc.

Vega ( α Lyr, α Lyrae, Alpha Lyrae ) is the brightest star in the constellation Lyra, the fifth brightest star in the night sky and the second brightest star in the northern celestial hemisphere, after Arcturus.

Of the top ten apparent brightest stars ( excluding our Sun )— Sirius, Canopus, Alpha Centauri, Arcturus, Vega, Capella, Rigel, Procyon, Achernar and Betelgeuse — Achernar is the hottest and bluest.

* Volume of Arcturus, brightest star in Boötes = ~ 1. 7

Arcturus ( magnitude-1. 01 ) is the brightest star of the night sky.

Capella ( α Aurigae, α Aur, Alpha Aurigae, Alpha Aur ) is the brightest star in the constellation Auriga, the eleventh brightest star in the night sky and the third brightest star in the northern celestial hemisphere, after Arcturus and Vega.

And even among those Stars which are reckoned of the brightest Class, there appears a Variety of Magnitude ; for Sirius or Arcturus are each of them brighter than Aldebaran or the Bull's Eye, or even than the Star in Spica ; and yet all these Stars are reckoned among the Stars of the first Order: And there are some Stars of such an intermedial Order, that the Astronomers have differed in classing of them ; some putting the same Stars in one Class, others in another.