Eta Andromedae
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 Eta Andromeda A/B. |
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| Observation data Equinox J2000 |
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|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 57m 12.4s |
| Declination | +23° 25' 03" |
| Apparent magnitude (V) | +4.40 (A) |
| Characteristics | |
| Spectral type | G8IIIb (A) |
| U-B color index | - |
| B-V color index | - |
| Variable type | Spectroscopic binary |
| Other designations | |
Eta Andromedae (η And / η Andromedae) is a star system in the constellation Andromeda. It is approximately 243 light years from Earth.
The primary component, η Andromedae A, is a yellow G-type giant with an apparent magnitude of +4.40. It is a spectroscopic binary whose components have an orbital period of 115.7 days. It's companion η Andromedae B, is 133.4 arcseconds away and has an apparent magnitude of +11.5.
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