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HD 59686

Binary star system in the constellation Gemini

Binary star system in the constellation Gemini

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HD 59686 is a binary star system in the northern constellation of Gemini. It is visible to the naked eye as a dim point of light with an apparent visual magnitude of +5.45. The distance to this system is approximately 288 light-years based on parallax, but it is drifting closer with a radial velocity of −33 km/s.

This is a single-lined spectroscopic binary system with an orbital period of 11680 days and a high eccentricity of 0.73. The visible component is an aging giant star with a stellar classification of K2III. It is most likely fusing helium in its core in a position on the H-R diagram called the red clump. The stellar radius is very large: 11.2 times that of the Sun. The star is around 2.7 billion years old with 1.4 times the mass of the Sun. It is radiating 58 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,670 K.

The secondary component has a minimum mass 53% that of the Sun, which indicates it must be a star rather than a brown dwarf or a planet.

Planetary system

Main article: HD 59686 Ab

The giant star HD 59686 A has one known planet, the gas giant HD 59686 Ab; it was discovered by Doppler spectroscopy and first announced in 2003, but the discovery was not formally published until 2016. HD 59686, along with Nu Octantis, is one of the closest binary star systems known to host a planet orbiting a single star.

References

| display-authors=1 | last1=Jofré | first1=E.

| display-authors=1 | journal=The Astronomical Journal

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| display-authors=1 | journal=Astronomy & Astrophysics

References

  1. "HD 59686".
  2. {{Cite Gaia DR3. 3169225963647395712
  3. {{cite XHIP. 36616
  4. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics.
  5. (2018). "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search". Astronomy and Astrophysics.
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k-type-giants planetary-systems-with-one-confirmed-planet spectroscopic-binaries gemini-(constellation) durchmusterung-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects
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