HD 5388 b
HD 5388 b (also known as HIP 4311 b) was thought to be an extrasolar planet orbiting the F-type main sequence star HD 5388, located approximately 175 light years away in the constellation Phoenix. It takes over two years to orbit the star at a semimajor axis of 1.76 AU with an eccentricity of 0.40.[1] It was announced on October 19, 2009, together with 29 other planets.
| Discovery | |
|---|---|
| Discovered by | Santos et al. |
| Discovery site | La Silla Observatory |
| Discovery date | October 19, 2009 |
| radial velocity (HARPS) | |
| Orbital characteristics | |
| Apastron | 2.46 AU (368,000,000 km) |
| Periastron | 1.06 AU (159,000,000 km) |
| 1.76 AU (263,000,000 km)[1] | |
| Eccentricity | 0.40 ± 0.02[1] |
| 777 ± 4[1] d 2.13 y | |
Average orbital speed | 24.7 |
| 2,454,570 ± 9[1] | |
| 324 ± 4[1] | |
| Semi-amplitude | 41.7 ± 1.6[1] |
| Star | HD 5388 |
| Physical characteristics | |
| Mass | 69[2] MJ |
This planet has been disproved and shown to be a brown dwarf.[2]
See also
References
- Santos, N. C.; et al. (2010). "The HARPS search for southern extrasolar planets XXI. Three new giant planets orbiting the metal-poor stars HD5388, HD181720, and HD190984". Astronomy and Astrophysics. 512. A47. arXiv:0912.3216. Bibcode:2010A&A...512A..47S. doi:10.1051/0004-6361/200913489.
- Sahlmann, J.; et al. (2011). "HD 5388 b is a 69 MJup companion instead of a planet". Astronomy and Astrophysics Letters. 528. L8. arXiv:1102.3372. Bibcode:2011A&A...528L...8S. doi:10.1051/0004-6361/201116533.
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