| Discovery | |
|---|---|
| Discovered by | Naefet al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics[1] | |
| 0.882+0.035 −0.039 AU | |
| Eccentricity | 0.742+0.017 −0.018 |
| 308.9+2.3 −2.8 d | |
| 2452535.102+17.503 −14.898 | |
| 268.525°+3.824° −4.523° | |
| Semi-amplitude | 25.439+1.472 −1.121 m/s |
| Star | HD 43197 |
| Physical characteristics[1] | |
| Mass | ≥0.553+0.052 −0.048 MJ |
HD 43197 b is anextrasolar planet which orbits theG-typemain sequence orsubgiantstarHD 43197, located approximately 204light years away in theconstellationCanis Major. This planet has aminimum mass 55% that ofJupiter and takes 0.85 years to orbit the star at asemimajor axis of 0.882AU.[2] It has a higheccentricity of 0.74, but itsinclination is not known. This planet was detected byHARPS on October 19, 2009, together with 29 other planets.
In 2022, a secondsuper-Jovian planet was discovered orbiting HD 43197 using a combination ofradial velocity andastrometry. Assuming HD 43197 b shares the outer planet'sorbital inclination, its true mass would be about4 MJ.[1]
The planet HD 43197 b is namedEquiano. The name was selected in theNameExoWorlds campaign byNigeria, during the 100th anniversary of theIAU.Olaudah Equiano was a writer and abolitionist fromIhiala, Nigeria who fought injustice and for the elimination of theslave trade.[3][4]
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