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11 Φεβ 2022 · Arcturus is a red giant star in the Northern Hemisphere of Earth 's sky and the brightest star in the constellation Boötes (the herdsman). Arcturus is also among the brightest stars that can...
9 Ιουν 2023 · Arcturus is a giant star of the spectral type K1.5IIIFe-0.5. It is the brightest class K giant in the sky, outshining Aldebaran (mag. 0.86) in the constellation Taurus and Pollux (mag. 1.14) in Gemini. It has an absolute magnitude of about -0.30.
20 Ιαν 2020 · Arcturus is symbolically part of the Behenian stars, and physically part of the Arcturus Stream – a collection of 52 stars that may be the remnants of a dwarf galaxy. Formation Analysis suggests that Arcturus formed in the outer reaches of the Milky Way’s galactic halo around 7.1 billion years ago.
With an apparent visual magnitude of −0.05, [2] it is the fourth-brightest star in the night sky, and the brightest in the northern celestial hemisphere. The name Arcturus originated from ancient Greece; it was then cataloged as α Boötis by Johann Bayer in 1603, which is Latinized to Alpha Boötis.
Arcturus is an orange giant star of the spectral type K0 III and is the brightest class K giant in the sky, with an absolute magnitude of about -0.30. It has around the same mass as the Sun, only 1.08 times the mass, yet is 25.4 times its size.
Arcturus is 37 light-years from Earth and radiates 115 times more light than the sun. Arcturus is called a high-velocity star because it moves through space (in the direction of the star Spica) at the rapid speed of approximately 93 miles (150 kilometers) per second relative to the Sun.
Definition. Arcturus is a red giant star that is one of the brightest stars in the night sky. It is located in the northern celestial hemisphere and is part of the constellation Boötes, the Herdsman. Arcturus is known for its distinctive orange-red color and is a prominent feature in the evening sky during certain times of the year.
