HD 5388 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 5388 | |
| Constellation | Phoenix | |
| Right ascension | (α) | 00h 55m 11.89s[1] |
| Declination | (δ) | –47° 24′ 21.5″[1] |
| Apparent magnitude | (mV) | 6.73[2] |
| Distance | 175 ± 6[1] ly (54 ± 2[1] pc) | |
| Spectral type | F6V[2] | |
| Orbital elements | ||
| Semi-major axis | (a) | 1.76[2] AU (264 Gm) |
| 32.5 mas | ||
| Periastron | (q) | 1.06 AU (158 Gm) |
| Apastron | (Q) | 2.46 AU (369 Gm) |
| Eccentricity | (e) | 0.40 ± 0.02[2] |
| Orbital period | (P) | 777 ± 4[2] d (2.13 y) |
| Orbital speed | (υ) | 24.7 km/s |
| Argument of periastron |
(ω) | 324 ± 4[2]° |
| Time of periastron | (T0) | 2,454,570 ± 9[2] JD |
| Semi-amplitude | (K) | 41.7 ± 1.6[2] m/s |
| Physical characteristics | ||
| Mass | (m) | 69[3] MJ |
| Discovery information | ||
| Discovery date | October 19, 2009 | |
| Discoverer(s) | Santos et al. | |
| Discovery method | radial velocity (HARPS) | |
| Discovery site | La Silla Observatory | |
| Discovery status | Published[2] | |
| Other designations | ||
| HIP 4311 b | ||
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
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.[2] It was announced on October 19, 2009, together with 29 other planets.
This planet has been disproved and shown to be a brown dwarf.[3]
See also
References
- 1 2 3 4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752
. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry - 1 2 3 4 5 6 7 8 9 10 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.
- 1 2 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.
Coordinates: 
00h 55m 11.8897s, −47° 24′ 21.475″
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