HD 47536

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HD 47536
Giant Star HD 47536.jpg
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
CD-32º 3216, GSC 07091-01257, HIP 31688, HR 2447, SAO 197019
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[edit]

Setiawan discovered both planets around the star: HD 47536 b in 2003[4][5] and HD 47536 c in 2007.

The HD 47536 planetary system
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[edit]

References[edit]

  1. ^ a b c d e 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
  2. ^ a b c d e f g 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 
  3. ^ 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 
  4. ^ "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. 
  5. ^ 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[edit]

Coordinates: Sky map 06h 37m 47.6189s, −32° 20′ 23.045″