K (orange )
Arcturus has a spectral class of K1 and has a temperature of around 4,700 K It is a red supergiant and has a radius 25 times that of our Sun. See related link for a pictorial representation against our Sun.
Spectral class is a classification system for stars based on their temperature and spectral characteristics. It categorizes stars into different groups, such as O, B, A, F, G, K, and M, with O being the hottest and M being the coolest. Spectral class is indicated by a letter, with additional subtype information denoted by a number.
The O spectral class is the highest temperature class. Stars in this class are extremely hot and blue in color, with surface temperatures exceeding 30,000 K.
Alpha Centauri A is a nearby star that is in the same spectral class as the sun, which is G-class. It is the primary component of the Alpha Centauri star system, located about 4.37 light-years away from Earth.
Arcturus
Arcturus is in class A.
The spectral class is A0Va.
Antares has a spectral class of M1LB.
Arcturus has a spectral class of K1 and has a temperature of around 4,700 K It is a red supergiant and has a radius 25 times that of our Sun. See related link for a pictorial representation against our Sun.
Spectral class Y, which is typical of "brown dwarf" stars.
Arcturus is a red giant and the brightest star in the constellation Boötes.It has a spectral type of K1 and will have a colour of orange to orange yellow.It is approximately 37 light years from us.See related link for a size comparison to our Sun.
Sirius is a double star. The brighter component ... the one you actually notice in the night sky ... is spectral class A1V. The faint 'secondary' component is spectral class DA2.
Arcturus is not a double star; it is classified as a single giant star, specifically a red giant of spectral type K1. However, it does have a very faint companion that is often not considered in the context of double stars due to its low brightness. This companion is not a part of Arcturus's primary system but is instead a background star. Therefore, Arcturus is primarily known as a solitary star.
Spectral class is a classification system for stars based on their temperature and spectral characteristics. It categorizes stars into different groups, such as O, B, A, F, G, K, and M, with O being the hottest and M being the coolest. Spectral class is indicated by a letter, with additional subtype information denoted by a number.
The O spectral class is the highest temperature class. Stars in this class are extremely hot and blue in color, with surface temperatures exceeding 30,000 K.
Two stars of the same spectral class must have the same temperature and color. This classification system groups stars based on their temperature, with each spectral class representing a specific range of temperatures.
An orange star is commonly known as a K-type star, which is the classification based on its temperature and color. An example of an orange star is Arcturus, the fourth-brightest star in the night sky.