HD 43691

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**HD 43691**
Observation data Epoch J2000.0
Constellation (pronunciation)	Auriga
Right ascension	06^h 19^m 34.68^s
Declination	+41º 05' 32.3"
Apparent magnitude (V)	+8.03
Distance	304 ly (93.2 pc)
Spectral type	G0IV-V
Other designations
BD +41°1415, HIP 30057, SAO 41025

HD 43691 is a star with magnitude +8.03 in the constellation Auriga. This yellow star is about to stop thermonuclear hydrogen-fusion in its core and eventually expand to become a red giant.

In 2007, the star is found to have a giant planet in orbit around it.

[edit] HD 43691 b

**HD 43691 b**
Orbital elements
Extrasolar planet		List of extrasolar planets
Semimajor axis	(a)	0.24 AU
Eccentricity	(e)	0.14±0.02
Orbital period	(P)	36.96±0.02 d
Angular distance	(θ)	2.575 mas
Longitude of periastron	(ω)	290±5°
Time of periastron	(T₀)	2454046.6 JD
Semi-amplitude	(K)	90.15 m/s
Physical characteristics
Mass	(m)	>2.49 M_J
Discovery information
Discovery date		2007
Discoverer(s)		Da Silva et al.
Detection method		Doppler spectroscopy
Discovery site		Geneva observatory
Discovery status		Published

HD 43691 b is a massive jovian planet, though only the minimum mass is known. It might be found to be a superjovian planet when its true mass is known. The planet orbits close to the star, closer than Mercury to the Sun.

[edit] References

Da Silva R., Udry S., Bouchy F., Moutou C., Mayor M., Beuzit J.-L., Bonfils X., Delfosse X., Desort M., Forveille T., Galland F., Hebrard G., Lagrange A.-M., Loeillet B., Lovis C., Pepe F., Perrier C., Pont F., Queloz D., Santos N., Segresan D., Sivan J.-P., Vidal-Madjar A. (2007). "Elodie metallicity-biased search for transiting Hot Jupiters. IV. Intermediate period planets orbiting the stars HD43691 and HD132406". Astron & Astrophys.