Gliese 251
Last updated
Gliese 251, also known as HIP 33226 or HD 265866, is a red dwarf star 18.2 light-years away in the constellation Gemini. It is the nearest star in Gemini and cannot be seen with the naked eye due to its apparent magnitude of +9.89.
Quick Facts
- Alternative designations
- HIP 33226, HD 265866
- Distance from solar system
- 18.2 light-years
- Constellation
- Gemini
- Apparent magnitude
- +9.89
- Spectral type
- M3V
- Effective temperature
- 3300 K
- Radius
- 36% solar radii
Facts from the source article.
Planetary system
Two candidate planets were initially detected in 2019 with orbital periods of 1.74 and 607 days, but a 2020 study using CARMENES data refuted both as stellar activity. That study confirmed one super-Earth, Gliese 251 b, with a 14.238-day orbit. A second super-Earth, planet c, was confirmed in 2025 and orbits within the circumstellar habitable zone; it may be directly imageable by next-generation telescopes such as the Thirty Meter Telescope.
More in Planetary Systems with Two Confirmed Planets
Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Gliese 251 (CC BY-SA 4.0).
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