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It is a red giant, 22 million miles in diameter or 35.7 million Kilometers. which is 25.7 times that of the sun and 2/3 the radius of of Mercury's orbit! The difference in size between our Sun and Arcturus would be, if the sun were the size of a BB, Arcturus would be larger than a soft ball about 4.5" or 113mm. Arcturus puts out more than 110 times as much light as the sun and is 36 light years away which is rather close, making it the third brightest star in the sky.
As large as it is there are stars far larger! The largest known star is Pistol. If Arcturus were a BB then Pistol would be a soccer ball and the sun would be a grain of sand! Pistol puts out an unbelievable 10 million times the light of the sun! It is very dim to us because it is 25,000 light years away and is in a cloud of nebula dust. Our sun would not be visible at all at that distance.
Alpha Centauri (Rigil Kentaurus, Rigil Kent, or Toliman) is the brightest star in the southern constellation of Centaurus.
It is actually a binary star, but appears to us as a single star.
- Alpha Centauri A has an absolute magnitude of +4.48
- Alpha Centauri B has an absolute magnitude of +5.71
It would take 36.7 light years to get to Arcturus from Earth. A light year is a unit of length just like an inch, mile or meter. Nevertheless, a very large unit. It's the distance light would travel in a year, which is about 9,460,730,472,600 km.
The absolute magnitude of Canopus is around -5.71. This makes it one of the brightest stars in the night sky.
Arcturus has an absolute magnitude of −0.30 (note the minus sign)
See related question about absolute magnitude.
The gentle orange glow of Arcturus is of visual magnitude -0.05 or so. A link can be found below.
Canopus's apparent magnitude is −0.72, the absolute magnitude is −5.53.
Regulus (Alpha Leonis) is the brightest star in the constellation Leo.
It has an absolute magnitude of -0.52
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What is absolute magnitude of Rigel?
Its absolute magnitude is -7.92
What is the magnitude of Altair star?
Apparent magnitude is 0.77 Absolute magnitude is 2.21Wikipedia lists its visual magnitude as 0.77.
What is the magnitude Betelgeuse?
Betelgeuse has an apparent magnitude of 0.58 and on absolute magnitude of -6.05.
What is the absolute brightness of the Rigel?
The absolute magnitude is -7.92
What is the absolute magnitude of cassiopeia?
Cassiopeia is a constellation, not a single star, so it does not have a specific absolute magnitude. The stars within the constellation Cassiopeia have a range of absolute magnitudes depending on their distance and luminosity.
What is the Antares absolute magnitude and its apparent magnitude?
Antares Absolute and Apparent Magnitude Absolute Magnitude~ -5.2 Apparent Magnitude~ +0.60
What is absolute magnitude of Rigel?
Its absolute magnitude is -7.92
What is second brightest star?
The second brightest star is Canopus with an apparent magnitude of -0.72The brightest is Sirius with an apparent magnitude of -1.47
What is Porrima's absolute magnitude?
The absolute magnitude of Porrima is 3.04.
What is the absolute magnitude of Altiar?
The star is called Altair; the absolute magnitude is estimated at 2.21.The star is called Altair; the absolute magnitude is estimated at 2.21.The star is called Altair; the absolute magnitude is estimated at 2.21.The star is called Altair; the absolute magnitude is estimated at 2.21.
What is the brightest to dimmest apparent magnitude in order vega archenar aldebaran arcturus hadar canopus procyon?
Canopus (-0.72), Vega (0.03), Arcturus (-0.04), Procyon (0.38), Hadar (0.61), Aldebaran (0.85), and Achernar (0.46) in order from brightest to dimmest apparent magnitude.
What is the absolute magnitude of the Milky Way?
An estimation of the absolute magnitude is −20.9. See related question.
Explain why size is the only factor that determines the stars absolute magnitude?
The absolute magnitude is a measure of the star's luminosity hence the smaller the size the less the absolute magnitude.
What is the magnitude of Altair star?
Apparent magnitude is 0.77 Absolute magnitude is 2.21Wikipedia lists its visual magnitude as 0.77.
What is the absolute magnitude of the constellation scorpius?
Constellations don't have an absolute magnitude. That is a property of individual stars.
How bright a star actually is at a distance of 32.6 light years away from earth is?
That's the number called the star's "Absolute Magnitude".That is called the star's "absolute magnitude".
What is the magnitude of Alpha Arietis?
the absolute magnitude is 0.48 <(-.-<)
