HD 203387

Measured

Distance

about 201 light-years

Confirmed planets

2

How far, from the Sun

About 201 light-years. To cross it:

• Light201 years
• Voyager 1's speed3.58 million years
• Driving at 100 km/h2.17 billion years

Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.

How it was found

• First planet found in 2022, by radial velocity (NASA Exoplanet Archive).

Its planets

• HD 203387 b — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 510 days; about 340 °C, hotter than boiling water; found in 2022 by radial velocity.
• HD 203387 c — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts about 7 Earth years; about 88 °C, between freezing and boiling; found in 2022 by radial velocity.

Where this comes from

• NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
• This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.

Every catalogue Ouranos draws is credited on the credits page.