Constellation List
Star List
By Season
Alphabetical
Latitudes
Minneapolis, MN (45°N)
NorthPole (90°N)
Prudhoe Bay, AK (70°N)
St.Petersburg,
Russia(60°N)
Prague, C.R. (50°N)
Philadelphia, PA (40°N)
Albuquerque, NM (35°N)
New Orleans, LA (30°N)
Santiago, Cuba (20°N)
Caracas,
Venezuela (10°N)
Quito, Ecuador (0°N)
Port Moresby,
New Guinea(10°S)
Porto Alegre,
Brazil (30°S)
Montevideo,
Uruguay(35°S)
Queenstown, NZ (45°S)
South Pole (90°S)
Bibliography and Credits
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Arcturus
(ark-TOO-rus)
Alpha Bootis
Names For This Star
"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.
Another name for the star is Haris-el-sema, from the Arabic Al Haris al Sama, "The Keeper of Heaven.
Description of the Star
The Hipparcos Catalogue mission discovered Arcturus to be a binary star system. Arcturus A is an orange colored giant K1.5IIIFe-0.5 star. The spectral type implies an effective temperature of the star is about 4300 K and a mass about 20 times that of the sun.
The Apparent Magnitude and distance indicate a luminosity 110 times that of the sun. The star has about 28 times the diameter of the sun.
The companion Arcturus B is about 3.3 magnitudes dimmer than A. At 0.255 arc sec of separation, the projected distance between the stars is 2.9 AU.
According to Burnham, Arcturus is the fourth brightest star in the sky.
Other Designations For This Star
Flamsteed |
16 Bootis |
Hipparcos Identifier (HIP Number) |
69673 |
Harvard Revised (HR Number) |
5340 |
Henry Draper Catalog (HD Number) |
124897 |
Bonner Durchmusterung (BD Number) |
BD+19 2777 |
Smithsonian Astrophysical
Observatory compendium (SAO Number) |
100944 |
Fundamental Katalog (FK5 Number) |
526 |
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