description HD 219134 b Overview
HD 219134 b is a rocky super-Earth exoplanet located approximately 21 light-years away in the constellation Cassiopeia. Discovered in 2015, it is notable for being one of the closest transiting exoplanets to our solar system, making it a valuable target for atmospheric study. The planet orbits its K-dwarf host star every three days. Its close proximity to its star likely results in high surface temperatures, making it uninhabitable.
help HD 219134 b FAQ
How far away is HD 219134 b from Earth?
HD 219134 b is located approximately 21 light-years away in the constellation Cassiopeia. Its proximity makes it one of the closest known transiting rocky exoplanets to our solar system and a high-priority target for future atmospheric characterization.
Is HD 219134 b in the habitable zone of its star?
No, HD 219134 b orbits far too close to its host star to support liquid water. It completes an orbit in fewer than three days, and its dayside temperature is estimated to exceed 1,000 degrees Celsius, making conditions far too extreme for life as we understand it.
How was HD 219134 b's rocky composition confirmed?
The planet was detected via radial velocity measurements using the HARPS-N spectrograph and confirmed by transit observations from NASA's Spitzer Space Telescope. Having both mass (from radial velocity) and radius (from transit depth) allowed astronomers to calculate its density, confirming a rocky composition.
Are there other planets in the HD 219134 system?
Yes, the HD 219134 system contains multiple confirmed planets—at least three and possibly up to five. The system includes both close-in rocky planets like HD 219134 b and longer-period companions, making it one of the more architecturally diverse nearby multi-planet systems.
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