Gliese 832 c
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | Gliese 832 | |
| Constellation | Grus | |
| Right ascension | (α) | 21h 33m 33.9752s |
| Declination | (δ) | –49° 00′ 32.422″ |
| Apparent magnitude | (mV) | 10.19 |
| Distance | 16.10 ly (4.938 pc) |
|
| Spectral type | M2V | |
| Mass | (m) | 0.45 (± 0.05) M☉ |
| Radius | (r) | 0.48 R☉ |
| Temperature | (T) | 3620 K |
| Metallicity | [Fe/H] | −0.31 (± 0.2) |
| Age | 9.54 Gyr | |
| Physical characteristics | ||
| Mass | (m) | ≥5.4 (± 1) M⊕ |
| Radius | (r) | ≥1.5(?) R⊕ |
| Stellar flux | (F⊙) | ~1.00 ⊕ |
| Temperature | (T) | 253 K (−20 °C; −4 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | 0.162 (± 0.017) AU |
| Eccentricity | (e) | 0.18 (± 0.13) |
| Orbital period | (P) | 35.68 (± 0.03) d |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
Gliese 832 c (also known as Gl 832 c or GJ 832 c) is an extrasolar planet located approximately 16 light-years (4.93 parsecs, or about 151,400,000,000,000 km) away in the constellation of Grus, orbiting the star Gliese 832, a red dwarf. The planet has an Earth Similarity Index of 0.81, one of the highest Earth Similarity Indices for any known extrasolar planet. It is in its star's habitable zone.
To date, it is the third closest known potentially habitable exoplanet to Earth. The closest potentially habitable exoplanet is Proxima Centauri b at 4.2 light years while the unconfirmed planet Tau Ceti e, lies just under 12 ly from the sun.
Gliese 832 c has a mass of approximately 5.2 times that of Earth. If it had the same density of Earth it would have a radius of around 1.75 R⊕ or possibly the planet could have a higher density with a smaller radius. Its temperature is predicted to be relatively similar to Earth's, but is subject to significant swings as it orbits its star. The planet has a relatively high eccentricity, taking it very near to the predicted inner edge of the habitable zone. The planet's average equilibrium temperature is predicted to be 253 kelvins (−20 °C), but is estimated to vary from 233 kelvins (−40 °C) at apoastron to 280 kelvins (7 °C) at periastron. However, because of its large mass, it may have a dense atmosphere, which could make it much hotter and more like the planet Venus.
The planet orbits a (M-type) star named Gliese 832, orbited by a total of two planets. The star has a mass of 0.45 M☉ and a radius of 0.48 R☉. It has a temperature of 3620 K and is estimated to be about 9.54 billion years old. In comparison, the Sun is 4.6 billion years old and has a temperature of 5778 K.
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