Zeta Herculis
Binary star system in Hercules, visible to the naked eye.
Zeta Herculis, also known as Tianji, is a binary star system in Hercules with a combined apparent visual magnitude of 2.81, visible to the naked eye. Parallax measurements place it about 35.0 light-years from Earth. The primary component is a subgiant star of class F9 IV, larger and more luminous than the Sun, while its companion is roughly solar-sized. The pair orbit each other every 34.45 years with an eccentricity of 0.46. The system belongs to the Zeta Herculis moving group, which includes several other stars.
Quick Facts
- Apparent visual magnitude
- 2.81
- Distance
- 35.0 ly
- Spectral type (primary)
- F9 IV
- Orbital period
- 34.45 years
- Orbital eccentricity
- 0.46
Facts from the source article.
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