Andromeda
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Star with planets

HR 8799

Also V342 Pegasi · HD 218396

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HR 8799 — JWST, infrared; star masked, its planets visible
JWST, infrared; star masked, its planets visible. Credit: NASA, ESA, CSA, STScI, W. Balmer (JHU), L. Pueyo (STScI), M. Perrin (STScI). Licence: CC BY 4.0. Source

A young star with four giant planets photographed directly, the first multi-planet system imaged.

Measured

Distance
133 light-years
Constellation
Pegasus
Position (J2000)
RA 23h 07m 29s, Dec +21.13°

How far, from the Sun

133 light-years. To cross it:

  • Light133 years
  • Voyager 1's speed2.37 million years
  • Driving at 100 km/h1.44 billion years

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

Facts

  • Its planets were the first multi-planet system directly imaged, announced in 2008.
  • Four giant planets, each several times Jupiter's mass, orbit about 15 to 70 AU out.
  • The star is only about 30 to 40 million years old.

Where this comes from

  • Gaia DR3 parallax 24.4620 ± 0.0455 mas, Gaia DR3 2832463659640297472 (Gaia Collaboration 2023, A&A 674, A1)

Every catalogue Ouranos draws is credited on the credits page.