Eta Phoenicis

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Eta Phoenicis (η Phe) is a white subgiant star in the constellation Phoenix. It shines at magnitude 4.36, so it’s visible to the naked eye under good skies, and lies about 246 light-years away.

Key facts
- Type: A0IV (white subgiant)
- Distance: ~246 light-years (about 76 parsecs)
- Mass: ~3 solar masses
- Luminosity: ~120 solar luminosities
- Temperature: ~9,800 K
- Metallicity: roughly solar
- Rotation: fairly fast (v sin i ~124 km/s)
- Debris disk: the primary has a surrounding debris disk

Companions
- Distant companion B: magnitude ~11.5, separated by about 20 arcseconds
- Close companion Ab: separation ~6.8 AU, orbital period a bit over 10 years, magnitude ~8.5, likely a G-type main-sequence star (roughly G5V)

Other identifiers: HD 4150, HIP 3405, HR 191, among others.