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Loading content20 Hydrae is a star in the constellation Hydra (Hydrae), lying about 481.8 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 | G8II |
| Luminosity class | II |
| Apparent magnitude | 5.47 |
| Absolute magnitude | -0.38 |
| Luminosity (Sun = 1) | 123 |
| Colour index (B−V) | 1.002 |
| Distance | 481.8 ly (147.71 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.