The rotation period of the planet-hosting star HD 189733

Gregory W. Henry, Joshua N. Winn

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


We present synoptic optical photometry of HD 189733, the chromospherically active parent star of one of the most intensively studied exoplanets. We have significantly extended the timespan of our previously reported observations and refined the estimate of the stellar rotation period by more than an order of magnitude: P = 11.953 ± 0.009 days. We derive a lower limit on the inclination of the stellar rotation axis of 54° (with 95% confidence), corroborating earlier evidence that the stellar spin axis and planetary orbital axis are well aligned.

Original languageEnglish (US)
Pages (from-to)68-71
Number of pages4
JournalAstronomical Journal
Issue number1
StatePublished - Jan 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planetary systems
  • Planetary systems: formation
  • Stars: individual (HD 189733)
  • Stars: rotation


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