System: | 1 Geminorum - All bodies | |
Distance to Sol: | 155.12 ly | |
Spectral Class: | K1 IV - Scoopable | |
Luminosity Class: | IV - Subgiant | |
Age: | 10,292 Million years | |
Solar Masses: | 0.5547 | |
Solar Radius: | 0.7542 | |
Surface Temperature: | 4,343 K | |
Absolute Magnitude: | 0.9673 | |
HIP ID: | 28734 | |
HD ID: | 41116 | |
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Class K stars are yellow-orange main sequence stars with a long and generally stable life. They range in mass from 0.6 to 0.9 solar masses and have a surface temperature reaching 5,000 K.
A subgiant is a star that is slightly brighter than a normal main-sequence (dwarf) star of the same spectral class, but not as bright as true giant stars. Although certain subgiants appear to be simply unusually bright metal-rich hydrogen-fusing stars (in the same way subdwarfs are unusually dim metal-poor hydrogen-fusing stars), they are generally believed to be stars that are ceasing or have already ceased fusing hydrogen in their cores. In stars of roughly a solar mass (M☉), this causes the core to contract, which increases the star's central temperature enough to move hydrogen fusion into a shell surrounding the core. This swells the star on the way to becoming a true giant.