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Loading content51 Geminorum is a main-sequence star in the constellation Gemini (Geminorum), lying about 540.9 light-years from Earth.
Class K. Cooler orange stars. Long-lived and abundant; many are stable hosts for planets. Such stars have surface temperatures around 3,700–5,200 K and appear orange to the eye.
| Spectral type | K3V |
| Luminosity class | V |
| Apparent magnitude | 5.07 |
| Absolute magnitude | -1.03 |
| Luminosity (Sun = 1) | 224 |
| Colour index (B−V) | 1.653 |
| Distance | 540.9 ly (165.84 pc) |
Values are real catalogue data; fields without a reliable value are omitted, never estimated.
A main-sequence star fuses hydrogen into helium in its core. It will remain on the main sequence for most of its life before evolving into a giant.
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.