HD 47536
 Sky area of 10 x 10 square arcmin around the 6th-magnitude giant star HD 47536. Reproduced from the Digital Sky Survey. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 06h 37m 47.62s[1] |
| Declination | −32° 20′ 23.0″[1] |
| Apparent magnitude (V) | +5.261 |
| Characteristics | |
| Spectral type | K0 III |
| B−V color index | +1.18 |
| Astrometry | |
| Radial velocity (Rv) | +78.8 km/s |
| Proper motion (μ) | RA: 108.06 ± 0.20[1] mas/yr Dec.: 64.60 ± 0.24[1] mas/yr |
| Parallax (π) | 8.11 ± 0.23[1] mas |
| Distance | 400 ± 10 ly (123 ± 3 pc) |
| Absolute magnitude (MV) | −0.17 ± 0.15[2] |
| Details | |
| Mass | 0.94 ± 0.06[2] M☉ |
| Radius | 21.3 ± 1.9[2] R☉ |
| Luminosity | 181 L☉ |
| Surface gravity (log g) | 1.72 ± 0.08[2] cgs |
| Temperature | 4,352[2] K |
| Metallicity [Fe/H] | −0.68[2] dex |
| Rotation | 625 days[3] |
| Age | 9.33 ± 1.88[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia | data |
HD 47536, also known as HR 2447, is a 5th magnitude K-type giant star located approximately 400 light-years away in the constellation of Canis Major. The exact mass of the star is unknown, either 1.1 or 3 MS. As of 2007, two planets are known in orbit around the lowest metallicity star.
Planetary system
Setiawan discovered both planets around the star: HD 47536 b in 2003[4][5] and HD 47536 c in 2007.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >4.96 MJ | 1.61 | 430 | 0.2 ± 0.08 | — | — |
| c | >6.98 MJ | 3.72 | 2500 | — | — | — |
See also
References
- 1 2 3 4 5 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 da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105
- ↑ Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1
- ↑ "Distant World in Peril Discovered from La Silla: Giant Exoplanet Orbits Giant Star". ESO for the Public (Press release). Garching, Germany: European Southern Observatory. 22 January 2003. Retrieved 30 December 2012.
- ↑ Setiawan, J.; et al. (2003). "Evidence of a sub-stellar companion around HD 47536". Astronomy and Astrophysics 398 (2): L19–L23. Bibcode:2003A&A...398L..19S. doi:10.1051/0004-6361:20021846.
External links
Coordinates: 
06h 37m 47.6189s, −32° 20′ 23.045″
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