- How to find and observe Eta Cas (TOTS#2) (eyesonthesky.com)
Eta Cas is a double star within our own Milky Way galaxy. It is quite close to Earth, at just 19.4 light years, so the photons reaching your eye from the star tonight are under 20 years old. What makes Eta Cassiopeiae so interesting is that the primary star is a G-class star much like our Sun. Our Sun would look similar from Eta Cas if we were peering back it it from there. It also has 97% of the mass, and is 101% of the radius of our Sun. It is much like a twin of our host star in many respects, though it is likely about a billion years older. Here is how to locate it.
- Eta Cassiopeiae (Wikipedia)
Eta Cassiopeiae (η Cassiopeiae, abbreviated Eta Cas, η Cas) is a binary star system in the northern constellation of Cassiopeia. Its binary nature was first discovered by William Herschel in August 1779. Based upon parallax measurements, the distance to this system is 19.42 light-years (5.95 parsecs) from the Sun. The two components are designated Eta Cassiopeiae A (officially named Achird /ˈeɪtʃərd/) and B.
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