HD 219134 b
| Exoplanet | List of exoplanets | |
|---|---|---|
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| Parent star | ||
| Star | HR 8832 | |
| Constellation | Cassiopeia | |
| Right ascension | (α) | 23h 13m 16.97632s[1] |
| Declination | (δ) | +57° 10′ 06.0823″[1] |
| Apparent magnitude | (mV) | 5.574[2] |
| Distance | 21.25[3] ly (6.52 pc) |
|
| Spectral type | K3 V[4] | |
| Temperature | (T) | 4710[4] K |
| Observed separation | ||
| Orbital elements | ||
| Semi-major axis | (a) | 0.0382 ± 0.0003[5] AU |
| Eccentricity | (e) | 0.00+0.13 −0.0[5] |
| Orbital period | (P) | 3.0937 ± 0.0004[5] d |
| Inclination | (i) | 85.058 ± 0.08[5]° |
| Physical characteristics | ||
| Mass | (m) | 4.47 ± 0.47[5] M⊕ |
| Radius | (r) | 1.606 ± 0.086[5] R⊕ |
| Density | (ρ) | 5.89 ± 1.17[5] g cm−3 |
| Discovery information | ||
| Discovery date | 2015 July 30 | |
| Discoverer(s) | ||
| Discovery method | radial velocity method (HARPS-N); transiting (Spitzer telescope) | |
| Discovery site | HARPS-N of the Telescopio Nazionale Galileo | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 219134 b (or HR 8832 b) is one of seven exoplanets orbiting HR 8832, a main-sequence star in the constellation of Cassiopeia.[3][5][6][7] As of July 2015, super-Earth HD 219134 b, with a size of about 1.6 Earth Radii, and a density of 6g/cm3, was reported as the closest rocky exoplanet to the Earth, at 21.25 light-years away.[3] The exoplanet was initially detected by the instrument HARPS-N of the Italian Telescopio Nazionale Galileo via the radial velocity method and subsequently observed by the Spitzer telescope as transiting in front of its star.[3][6] The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days.[3]
See also
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References
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- ↑ PLANET HOST OVERVIEW PAGE
External links
- Cassiopeia Constellation at Constellation Guide
- The Deep Photographic Guide to the Constellations: Cassiopeia
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Coordinates: 
23h 13m 16.98s, +57° 10′ 06.1″
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