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1 Centauri

Yellow-white-hued star in the constellation Centaurus

Summary

Yellow-white-hued star in the constellation Centaurus

| b-v = +0.38 | u-b = +0.00 1 Centauri, or i Centauri, is a yellow-white-hued binary star system in the southern constellation Centaurus. It can be seen with the naked eye, having an apparent visual magnitude of +4.23. Based upon an annual parallax shift of 51.54 mas as seen from Earth's orbit, it is located 63.3 light-years from the Sun. The system is moving closer to the Sun with a radial velocity of −21.5 km/s.

Spectrographic images taken at the Cape Observatory between 1921 and 1923 showed this star has a variable radial velocity, which indicated this is a single-lined spectroscopic binary star system. The pair have an orbital period of 9.94 days and an eccentricity of about 0.2.

The primary component has received a number of different stellar classifications. For example, Jaschek et al. (1964) lists F0V, F2III, F4III and F4IV, thus ranging in evolutionary state from an ordinary F-type main-sequence star to a giant star. More recently, Houk (1982) listed a class of F3 V, matching an ordinary main-sequence star that is generating energy through hydrogen fusion at its core. The NStars project gives it a classification of F2 V.

References

| display-authors=1 | last1=Pizzolato | first1=N.

| publication-place=Ann Arbor, Michigan | postscript=.

| display-authors=1 | last1=Montesinos | first1=B.

References

  1. "1 Cen".
  2. (2023). "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets". The Astronomical Journal.
  3. (1991). "The Bright star catalogue". New Haven.
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f-type-main-sequence-stars spectroscopic-binaries centaurus bayer-objects durchmusterung-objects flamsteed-objects gliese-and-gj-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
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