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Charting the system…

HD 219134

a real K-star system, 21 light-years away6 planets← All exoplanets
Host star

HD 219134

Type
K-type (Orange)
Spectral type
K3 V
Temperature
4,913 K
Radius
0.77 ☉
Mass
0.794 ☉
Known planets
6
Luminosity
0.310 ☉

Published by the NASA Exoplanet Archive. These planets’ temperatures and habitability scores are computed from this star’s measured luminosity, not from a stand-in for its class.

HD 219134 b — 0.04 AUHD 219134 c — 0.07 AUHD 219134 f — 0.15 AUHD 219134 d — 0.24 AUHD 219134 g — 0.38 AUHD 219134 h — 3.11 AUHD 219134 bHD 219134 cHD 219134 fHD 219134 dHD 219134 gHD 219134 h
HD 219134 b
HD 219134 bLava WorldHabitability 0 · Uninhabitable0.04 AU · 4.74 M⊕
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HD 219134 c
HD 219134 cRocky TerrestrialHabitability 6 · Uninhabitable0.07 AU · 4.36 M⊕
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HD 219134 f
HD 219134 fRocky TerrestrialHabitability 0 · Uninhabitable0.15 AU · 7.3 M⊕
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HD 219134 d
HD 219134 dGas GiantHabitability 13 · Uninhabitable0.24 AU · 16.2 M⊕
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HD 219134 g
HD 219134 gIce GiantHabitability 26 · Extremely Harsh0.38 AU · 10.8 M⊕
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HD 219134 h
HD 219134 hGas GiantHabitability 19 · Uninhabitable3.11 AU · 108 M⊕
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A binary star system's orrery: two suns close together, a red dashed dead-zone boundary, and a debris trail left by a destroyed world

New: Binary Star Systems 🌀

A system can now orbit two suns. Add a companion star when you build one — close, medium, or wide — and the physics decides what survives: a shared center of mass carves out a dead zone where gravity from both stars tears a world apart, leaving it as debris, and every surviving planet's orbit goes elliptical, moving fastest at closest approach and slowest out at aphelion. Push the separation to wide and the dead zone opens tens of AU across, wide enough to gut a system that would have been stable around one star alone. Stand on a world that made it through and you'll watch two suns cross the sky together.

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