Eta Cassiopeiae A and B are separated from one another by about 71 AU. The two components of the Achird / Eta Cassiopeiae star system have an orbital period of around 480 years. Both components, compared to our Sun, have shown only half the abundance of elements other than hydrogen and helium. Eta Cassiopeiae B is also cooler, having an effective temperature of around 4,036 K, it is also cooler than our Sun.Įta Cassiopeiae B generates energy slowly since it is small, radiating only 6% of our Sun’s luminosity. The secondary star, Eta Cassiopeiae B, is a K-type main-sequence star of spectral type K7V, having an apparent magnitude of 7.51. Eta Cassiopeiae A is radiating around 129% of the Sun’s luminosity. The rotational velocity of the primary star is 3.15 km / 1.9 mi per second. The primary star, Eta Cassiopeiae A, is a G-type main-sequence star of spectral type G0V, similar to our Sun, and has an apparent magnitude of 3.44.Įta Cassiopeiae A has an average surface temperature estimated at around 5,973 K, a bit hotter than on our Sun which has temperatures of around 5,778 K. The secondary star, Eta Cassiopeiae B, is smaller, having only 0.57 solar masses, or 57% of our Sun’s mass, and 0.66 solar radii or 66% of our Sun’s radius. However, Eta Cassiopeiae A has 1.03 solar radii, which is 103% of our Sun’s radius. The primary component, Eta Cassiopeiae A, has only 0.972 solar masses, or 97.2% of our Sun’s mass, thus it is slightly lighter. It is among the closest stars to us, and what makes the primary star special, is that is is similar to our own Sun. Distance, Size, and MassĪchird / Eta Cassiopeiae – is located at around 19 light-years away from the Sun. It is similar in age to our Sun, and probably formed in the same way, from swirling dust and gas pulled together by gravity. FormationĪchird / Eta Cassiopeiae – formed around 5.4 ± 0.9 billion years ago. ![]() In 2017, the IAU approved the name Achird for the primary star, Eta Cassiopeiae A. Richard Hinckley Allen gives no historical names for the star in his book Star Names: Their Lore and Meaning. The name Achird was supposedly first applied to Eta Cassiopeiae in the Skalnate Pleso Atlas of the Heavens that was published in 1950 but is not known before that. The two components of the Achird star system orbit around one another once every 480 years.Both components, compared to our Sun, have shown only half the abundance of elements other than hydrogen and helium.Eta Cassiopeiae B generates energy slowly since it is small, radiating only 6% of our Sun’s luminosity.The secondary star is also cooler, having an effective temperature of around 4,036 K.Eta Cassiopeiae B has only 57% of our Sun’s mass, and 66% of its radius.The secondary star, Eta Cassiopeiae B, is a K-type main-sequence star of spectral type K7V.Eta Cassiopeiae A is radiating around 129% of the Sun’s luminosity.The rotational velocity of the primary star is 3.15 km / 1.9 mi per second.Eta Cassiopeiae A is older than our Sun, having an estimated age of 5.4 billion years.The average surface temperatures on Eta Cassiopeiae A have been estimated at around 5,973 K, a bit hotter than on our Sun.Eta Cassiopeiae A is slightly lighter than our Sun, having 0.9 solar masses, and a radius of 1.03 solar radii, slightly bigger than our Sun. ![]()
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