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Star with planets

KELT-9

Also HD 195689

Open in Ouranos

A star on the line between spectral types A and B, about 10,170 K, with the hottest giant planet known, KELT-9 b.

Measured

Distance
676 light-years
Constellation
Cygnus
Position (J2000)
RA 20h 31m 26s, Dec +39.94°

How far, from the Sun

676 light-years. To cross it:

  • Light676 years
  • Voyager 1's speed12 million years
  • Driving at 100 km/h7.29 billion years

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

Facts

  • The dayside of KELT-9 b is hotter than many stars, about 4,600 K.
  • Its distance comes from a Gaia parallax: the tiny yearly shift in its position as the Earth circles the Sun.

Where this comes from

  • Gaia DR3 parallax 4.8258 ± 0.0248 mas, Gaia DR3 2064327278651198336 (Gaia Collaboration 2023, A&A 674, A1)
  • This research has made use of the SIMBAD database, CDS, Strasbourg, France (Wenger et al. 2000, A&AS 143, 9).
  • This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France (DOI: 10.26093/cds/vizier).

Every catalogue Ouranos draws is credited on the credits page.