Eta Cassiopeiae AB

Star type
g A: G3 (habitable)
g B: K7 (habitable)

Distance from Earth
g 19.42 ly

Star Service No.
g NA

Age
g A: 3.205 by (but appears to be more evolved then Sol)
g B: NA

Diameter/Mass/Temp (xSol)
g A: 98%-101%; 90%-110%; 5600/3800 K
g B: 66%; 56%; NA

Brightness (xSol)
g A: 120%
g B: 3%

Metallicity
g A: 63%-68%
g B: 63%-68%

Comparison to Sol
g A: See chart (similar to Sol)
g B: See chart (similar Alpha Centauri B)

Picture of star
g A: See picture
g B: See picture (Star A is bright white; Star B is yellow-orange.)

Star system features
g Star A and B are separated by an "average" distance of 71 times the Earth-Sun distance (AU) (of a semi-major axis) in an eccentric orbit (e= 0.497) of about 480 years, so that the two stars get as close as 36 AU and as far away as 107 AU

Known planets
g A: None
g B: None

Habitable zone
g A: Distance from star where an Earth-type planet would be "comfortable" with liquid water is centered around 1.13 AU ; such a planet would have an orbital period of about 1.15 years. Probability of a habitable planet is 5.7%.
g B: Liquid water zone would be centered around 0.18 AU, where the orbital period would be 37 days. Probability of a habitable planet: is 0.1% (if planet is satellite-stabilized).

Orbital map
g See orbital map

View from star
g See sky map

Nearby stars
(Star systems with 10 light years)
g BD+56 2966: 4.9 ly
g Mu Cassiopeiae 2: 5.4 ly
g EV Lacertae AB: 7.8 ly
g Kruger 60 AB: 8.2 ly
g Groombridge 34 Aab,B: 8.7 ly
g Stein 2051 AB: 9.2 ly

Map locating star system
g See stellar map

Location in Earth sky
g In the central part of Constellation Cassiopeia, the Lady of the Chair, northeast of Schedar (Alpha Cassiopeiae) and southwest of Mu Cassiopeiae

Other names
g Achird
g Gliese 34 AB
g HD 4614 AB
g The Third Star of Wang Liang
g A: Hip 3821
g A: LHS 123
g A: Eta Cas
g A: 24 Cas
g A: HR 219
g A: BD+57 150
g A: SAO 21732
g A: LTT 10287
g A: LFT 74
g A: Wolf 24
g A: Struve 60
g A: ADS 671 A
g B: LHS 122
g B: ADS 671 B

Sci-fi mentions
g "Terra Nova", episode of Star Trek: Enterprise television series. The planet Terra Nova, also known as Eta Cassiopeia III (sic), is located in the Eta Cassiopeiae system.
g Frontier: Elite II and Frontier: First Encounters, computer games. The Federation has a naval base in the Eta Cassiopeiae system.

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