HD 50554

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**HD 50554**
Observation data Epoch J2000.0
Constellation (pronunciation)	Gemini
Right ascension	06^h 54^m 42^s
Declination	+24º 14' 44″
Apparent magnitude (V)	6.860
Absolute magnitude (V)	4.401
Distance	101.21 ly (31.03 pc)
Spectral type	F8V
Other designations
HIP 33212

HD 50554 is a star in the constellation Gemini. It is a yellow-white main-sequence star [F8V] that is currently fuse hydrogen in its core. Since if star is 7^th magnitude, it is not visible to the unaided eye, but with binoculars or a telescope, it should be easy to see this star. The star is located 0.958 exameters from the Sun. The age of the star is only 10 million years older than our Sun. It is a population I star with metallicity of –0.07 dex [Fe/H] or 85% as much metals as the Sun.

In 2002, a giant planet was found orbiting the star.

1 HD 50554 b
2 References
3 See also
4 External links

[edit] HD 50554 b

**HD 50554 b**
Orbital elements

Semi-major axis a:	2.28±0.17 AU
Eccentricity e:	0.437±0.038
Orbital period P:	1223±12 d
Inclination i:	?°
Angular distance θ:	73.477 mas
Longitude of periastron ω:	7.9±4.3°
Time of periastron τ:	2450649±16 JD
Semi-amplitude K:	89.4±7.6 m/s
Physical characteristics
Mass:	>4.38±0.02 M_J
Radius:	>0.98 (Estimated) R_J
Density:	? kg/m³
Gravity:	9.8 g
Temperature:	? K
Discovery
Discovery date:	2002
Discovery site:	United States
Detection method(s):	doppler spectroscopy
Discoverer(s):	Fischer, Marcy, Butler, and Vogt et al.
Other catalogue

HD 50554 b is a Jupiter sized extrasolar planet with minimum mass 4.4 times that of Jupiter, classifying as low-mass superjovian. The period of this planet is 175 weeks. The real separation between a planet from the star is 341 gigameters or 11.1 μpc. Combining with known distance in parsecs, the apparent separation would be about 73.5 milliarcseconds.

The planet was discovered in 2002 by four team members including Debra Fischer, who used doppler spectroscopy to measure the wobbling of the stars that’ll indicate the presence of planets caused by the planet’s gravity.