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Chi Scorpii

Orange-hued giant star in the constellation Scorpius

Orange-hued giant star in the constellation Scorpius

| b-v = +1.39 | u-b = +1.54

Chi Scorpii, Latinized from χ Scorpii, is a single star in the zodiac constellation of Scorpius. It has an orange hue and can be faintly seen with the naked eye with an apparent visual magnitude of 5.24. Based upon parallax measurements, this star is around 448 light years from the Sun. The star is drifting closer with a radial velocity of −23.6 km/s.

This is an aging K-type giant star with a stellar classification of K3 III, which means it has exhausted the supply of hydrogen at its core. There is a 57% chance that this evolved star is on the horizontal branch and a 43% chance it is still on the red-giant branch. If it is on the former, the star is estimated to have 1.09 times the mass of the Sun, nearly 27 times the solar radius and shines with 191 times the Sun's luminosity. It is around 8 billion years old.

Planetary system

One superjovian planet orbiting Chi Scorpii was detected in 2020 on a mildly eccentric orbit utilizing the radial velocity method.

References

| display-authors=1 | last1=Nidever | first1=David L.

| display-authors=1 | last1=Reffert | first1=Sabine

References

  1. {{Cite Gaia DR3. 4342464209753404416
  2. (December 2020). "Precise radial velocities of giant stars. XIV. Evidence of planetary companions around HD 25723, 17 Sco, 3 Cnc, and 44 UMa". Astronomy & Astrophysics.
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k-type-giants scorpius bayer-objects durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects planetary-systems-with-one-confirmed-planet
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