HD 85512 b
| Exoplanet | List of exoplanets | |
|---|---|---|
 |
||
| Parent star | ||
| Star | HD 85512 | |
| Constellation | Vela | |
| Right ascension | (α) | 09h 51m 07.1s |
| Declination | (δ) | −43° 30′ 10″ |
| Apparent magnitude | (mV) | 7.66 |
| Distance | 36 ly (11.1 ± 0.1 pc) |
|
| Spectral type | K5V | |
| Mass | (m) | 0.69 M☉ |
| Radius | (r) | 0.533 (± 0.04) R☉ |
| Temperature | (T) | 4715 (± 102) K |
| Metallicity | [Fe/H] | −0.33 (± 0.03) |
| Age | 5.61 (± 0.61) Gyr | |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 3.6 (± 0.5) M⊕ |
| Radius | (r) | ≥1.3(?) R⊕ |
| Stellar flux | (F⊙) | 1.85 ⊕ |
| Temperature | (T) | 298 K (25 °C; 77 °F) |
| Orbital elements | ||
| Semi-major axis | (a) | (0.26 ± 0.005)AU |
| Eccentricity | (e) | (0.11 ± 0.1) |
| Orbital period | (P) | 54.43 (± 0.13)d |
| Orbital speed | (υ) | 94.913 ± 0.038 km/s |
| Discovery information | ||
| Discovery date | August 17, 2011 | |
| Discoverer(s) | Pepe et al. | |
| Discovery method | Radial velocity (HARPS) | |
| Discovery site | La Silla Observatory | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 85512 b is an exoplanet orbiting HD 85512, a K-type main-sequence star approximately 36 light-years from Earth in the constellation of Vela.
Due to its mass of at least 3.6 times the mass of Earth, HD 85512 b is classified as a rocky Earth-size exoplanet (<5M⊕) and is one of the smallest exoplanets discovered to be just outside the inner edge of the habitable zone. HD 85512 b, along with Gliese 581 d, was once considered to be one of the best candidates for habitability in 2011.
The planet has a minimum Earth mass of 3.6 ± 0.5, minimum surface gravity of about 1.4 g and assuming an atmosphere like Earth's despite its far greater mass, an estimated temperature of 298 K (24.85 °C or 76.73 °F) at the top of its atmosphere. The estimated temperature is noted to be similar to temperatures in Southern France, but various atmospheric conditions prevalent in the planet have to be analyzed to estimate the temperature of the surface. An estimated radius of 1.3 R⊕ is possible based on its mass.
The planet orbits a (K-type) star named HD 85512. The star has a mass of 0.69 M☉ and a radius of around 0.53 R☉. It has a surface temperature of 4715 K and is 5.61 billion years old. In comparison, the Sun is about 4.6 billion years old and has a surface temperature of 5778 K.
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 7.43 Therefore, HD 85512 is too dim to be seen with the naked eye, but can be viewed using good binoculars.
The planet orbits the parent star with about 11% of the Sun's luminosity at a distance of about 0.26 AU, with an orbital period of about 54 days, and possibly tidally locked.
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