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HD 47186

G-type star in the constellation Canis Major

G-type star in the constellation Canis Major

| b-v = | u-b =

HD 47186 is a star with a pair of orbiting exoplanets in the southern constellation of Canis Major. The system is located at a distance of 122 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 4.2 km/s. Although it has an absolute magnitude of 4.64, at the distance of this system the apparent visual magnitude is 7.63; too faint to be seen with the naked eye. It has a high proper motion, traversing the celestial sphere at an angular rate of ·yr−1.

The spectrum of HD 47186 matches a G-type main-sequence star with a stellar classification of G6V. It is an estimated 5.5 billion years old and is spinning with a projected rotational velocity of 2 km/s. The star has 5% greater mass and a 12% larger girth compared to the Sun. The abundance of iron, a measure of the star's metallicity, is 1.7 times more than the Sun, making it metal-rich. HD 47186 is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,736 K.

Planetary system

Announced in June 2008, two extrasolar planets were discovered orbiting the star. Both planets are less massive than Jupiter. The inner planet HD 47186 b orbits close to the star and is termed a “hot Neptune”. The outer planet HD 47186 c orbits in a similar distance from the star as the asteroid Vesta, at around 2.4 AU. The inner planet orbits in a circular path while the outer planet orbits in an eccentric path.

References

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

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

| display-authors=1 | last1=Bouchy | first1=François

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

| display-authors=1 | last1=Costa Silva | first1=A. R.

References

  1. {{Cite Gaia DR3. 2919760965879179136
  2. {{cite XHIP. 31540
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g-type-main-sequence-stars planetary-systems-with-two-confirmed-planets canis-major durchmusterung-objects henry-draper-catalogue-objects hipparcos-objects
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