HD 80606

Star

HD 80606 — a Sun-like G-type star ~217 light-years away in Ursa Major, the planet-hosting member of a wide binary. It is unremarkable but for the planet on its extraordinarily elongated orbit.

Open in 3D viewSee HD 80606 in the live, interactive 3D map

Key facts

Mass

2.09 × 10³⁰ kg

1.05 M☉

Radius

730,485 km

1.05× wider than the Sun

Surface temperature

5,565 K (5292 °C)

Spectral type

G5 (a Sun-like yellow dwarf)

Science

Physical

Mass: 2.09 × 10³⁰ kg · 1.05 M☉
Radius: 730,485 km · 1.05× wider than the Sun
Density: 1,279 kg/m³ · 1.3× water
Spectral type: G5 (a Sun-like yellow dwarf)

Composition

By mass: A near solar-twin (~1.05 solar masses) and the marginally brighter member of a near-identical wide binary with HD 80607 (V 9.06 vs 9.17) — the two are so alike they are often called twins.

Temperature

Surface: 5,565 K (5292 °C)

Radiation & temperature

Luminosity: 3.65 × 10²⁶ W · 0.953 L☉
Surface temperature: 5,565 K (5292 °C)
Peak wavelength: 521 nm · green-yellow visible light

Discovery & history

Name: A Henry Draper Catalogue designation.

Catalogued long ago; in 2001 radial-velocity measurements revealed its planet's extreme orbit.

Images

Where to find it — in Ursa Major, the Great Bear (IAU constellation chart). To the eye it is a single point of light; no telescope has imaged its surface. — IAU / Sky & Telescope, R. Sinnott & R. Fienberg (CC BY 3.0) · Wikimedia Commons

Images from open archives · credit shown per image