HD 47536

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**HD 47536**
Observation data Epoch J2000.0
Constellation (pronunciation)	Canis Major
Right ascension	06^h 37^m 47.6^s
Declination	-32º 20' 23"
Apparent magnitude (V)	+5.261
Characteristics
Spectral type	K0III
B-V color index	+1.18
Astrometry
Radial velocity (R_v)	+78.8 km/s
Proper motion (μ)	RA: 108.96 mas/yr Dec.: 64.13 mas/yr
Parallax (π)	8.24 ± 0.56 mas
Distance	395.83 ly (121.36 pc)
Absolute magnitude (M_V)	-0.159
Details
Mass	1.1 or 3 M_☉
Radius	23.47 ± 1.97 R_☉
Surface gravity (log g)	1.27
Luminosity	181 L_☉
Temperature	4380 K
Metallicity	21% Sun
Age	9.33 ± 1.88 × 10⁹ years
Other designations
CD-32º 3216, GC 8667, GSC 07091-01257, HIP 31688, HR 2447, SAO 197019

HD 47536 is a 5^th magnitude giant star in the constellation of Canis Major. The exact mass of the star is unknown, either 1.1 or 3 M_S. As of 2007, two planets are known in orbit around the lowest metallicity star.

1 Planets
- 1.1 HD 47536 b
- 1.2 HD 47536 c
2 References
3 External links

[edit] Planets

[edit] HD 47536 b

**HD 47536 b**
Orbital elements

Semi-major axis a:	1.61 AU
Eccentricity e:	0.2 ± 0.08
Orbital period P:	430 d
Inclination i:	?°
Angular distance θ:	13.266 mas
Longitude of periastron ω:	260.8 ± 23.7°
Time of periastron τ:	2,451,599 ± 21.5 JD
Semi-amplitude K:	113 ± 11 m/s
Physical characteristics
Mass:	>4.96 M_J
Radius:	>1.0 (Estimated) R_J
Density:	? kg/m³
Gravity:	? g
Temperature:	>740 K
Discovery
Discovery date:	January 22, 2003
Discovery site:
Detection method(s):	Radial velocity
Discoverer(s):	Setiawan et al.
Other catalogue

The first planet, designated as HD 47536 b is a mid-superjovian and Clarified Jovian. The mass and semimajor axis are not exactly known, the mass can either be 4.96 or 9.67 M_J and semimajor axis can either be 1.61 or 2.25 AU, both depending on the mass of parent star. The orbital period about HD 47536 is 430 days or 1.18 year.

[edit] HD 47536 c

**HD 47536 c**
Orbital elements

Semi-major axis a:	3.72 AU
Eccentricity e:	0.14
Orbital period P:	2500 d
Inclination i:	?°
Angular distance θ:	30.678 mas
Longitude of periastron ω:	?°
Time of periastron τ:	? JD
Semi-amplitude K:	? m/s
Physical characteristics
Mass:	>6.98 M_J
Radius:	>0.92 (Estimated) R_J
Density:	? kg/m³
Gravity:	? g
Temperature:	>502 K
Discovery
Discovery date:	April 9, 2007
Discovery site:
Detection method(s):	Radial velocity
Discoverer(s):	Setiawan et al.
Other catalogue

The second planet, designated as HD 47536 c is also a mid-superjovian and Clarified Jovian. Like the first planet, mass and semimajor axis are not exactly known. The mass can either be 6.98 or 13.61 M_J and semimajor axis of 3.72 or 5.20 AU, both depending on the mass of the star. The planet takes 2500 days or 6.84 years to orbit HD 47536. Unlike most planets, eccentricity of the orbit is generally not known, speculately 0.14.