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Loading contentEta Circini is a star in the constellation Circinus (Circini), lying about 275.94 light-years from Earth.
Class G. Yellow stars like the Sun. On the main sequence they steadily fuse hydrogen into helium. Such stars have surface temperatures around 5,200–6,000 K and appear yellow to the eye.
| Spectral type | G8III |
| Luminosity class | III |
| Apparent magnitude | 5.16 |
| Absolute magnitude | 0.52 |
| Luminosity (Sun = 1) | 53.802 |
| Colour index (B−V) | 0.935 |
| Distance | 275.94 ly (84.6 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
Facts on this topic will be cited from these primary and reference sources.
Aggregated, openly-licensed star catalogue combining Hipparcos, the Yale Bright Star Catalogue, and the Gliese Catalogue of Nearby Stars.
High-precision parallax, magnitude, and position for ~118,000 stars.