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ACHIRD (Eta Cassiopeiae). At almost fourth magnitude (3.44) and faint to the eye, and not a part of the traditional outline of Cassiopeia, Achird is often neglected. It is, however, among the glories of the celestial Queen's retinue.
Also called Achird, Eta Cassiopeiae (Eta Cas) is located about 19.4 light-years (ly) from our Sun, Sol, in the central part (00:49:06.29+57:48:54.67, ICRS 2000.0) of Constellation Cassiopeia, ...
Main named stars in Cassiopeia: (Greek alphabet)
Achird (η Cas), Caph (β Cas), Chi (γ Cas), Marfak (θ,μ Cas), Ruchbah (δ Cas), Schedar (α Cas), Segin (Navi, ε Cas).
Named Stars: SHEDIR (Alpha Cas) Caph (Beta Cas) Ruchbah (Delta Cas) Segin (Epsilon Cas) Achird (Eta Cas) Marfak (Theta Cas) Marfak (Mu Cas)
Two open clusters are visible in binoculars within the constellation.
 See also: Cassiopeia, Solar, Star, Distance, Milky Way
  
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