HD 219134
system
HD 219134 is a naked-eye orange dwarf 21.3 light-years away in Cassiopeia, and the closest star known to host a TRANSITING rocky planet. Four planets are confirmed; the inner two cross the star's face, so their sizes and densities are genuinely measured. Two further radial-velocity signals (f and g) are now regarded as stellar-activity artefacts and are not shown.
Open in 3D viewSee HD 219134 in the live, interactive 3D map
Key facts
Type
Orange dwarf + 4 planets
Distance
21.3 light-years
Confirmed planets
4
Notable
Nearest transiting rocky planet
Science
Classification
- Type
- Single orange-dwarf system
- Central star
- HD 219134 — K3V orange dwarf (~4699 K, 0.81 M☉), naked-eye
Planets
- Confirmed planets
- 4 · b, c, d, h — b & c transit
- Measured
- b & c have real sizes + densities (they transit)
- Disputed
- f & g omitted
Distance
- Distance
- 21.3 light-years · in Cassiopeia
How we know
- Note
- Four confirmed planets (NASA Exoplanet Archive, checked 2026-07-07); b & c transit, so their sizes and densities are real, while d and h are radial-velocity (no measured size). Two further signals, f and g, are flagged controversial and are NOT shown. Map distance is symbolic; the real gap is 21.3 light-years.
Discovery & history
- Name
- A Henry Draper designation; also Gliese 892 and HR 8832.
Found in 2015; its innermost planet was caught transiting by Spitzer, the closest transiting rocky planet known. Two further signals (f, g) are unconfirmed activity artefacts and are not shown.
Images
Images from open archives · credit shown per image