HD 209458

Measured

Distance

157 light-years

Constellation

Pegasus

Position (J2000)

RA 22h 03m 11s, Dec +18.88°

How far, from the Sun

157 light-years. To cross it:

• Light157 years
• Voyager 1's speed2.79 million years
• Driving at 100 km/h1.69 billion years

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

Facts

• It was the first exoplanet whose atmosphere was detected, in Hubble results announced in 2001.
• Nicknamed Osiris, the planet orbits every 3.5 days and is losing hydrogen into space.

How it was found

• Its planet was the first seen to transit its star, in 1999.

Where this comes from

• Gaia DR3 parallax 20.7694 ± 0.0266 mas, Gaia DR3 1779546757669063552 (Gaia Collaboration 2023, A&A 674, A1)

Every catalogue Ouranos draws is credited on the credits page.