HD 190647

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HD 190647

Observation data Epoch J2000.0
Constellation (pronunciation)	Sagittarius
Right ascension	20h 07m 19.670s
Declination	-35° 32′ 19.08″
Apparent magnitude (V)	+7.78
Absolute magnitude (V)	+4.11
Distance	176.8 ly (54.2 pc)
Spectral type	G5
Other designations
HIP 99115

HD 190647 is a yellow star in the constellation Sagittarius, located 1.6725 exameters from the Sun. The apparent magnitude is 8 and absolute magnitude is 4. It is also called HIP 99115.

[edit] HD 190647 b

HD 190647 b

Extrasolar planet		List of extrasolar planets
Orbital elements
Semimajor axis	(a)	2.07 ± 0.06 AU
Eccentricity	(e)	0.18 ± 0.02
Orbital period	(P)	1038.1 ± 5.1 d
Angular distance	(θ)	38.192 mas
Longitude of periastron	(ω)	232.5 ± 9.6°
Time of periastron	(T0)	2,453,868 ± 25 JD
Semi-amplitude	(K)	36.4 ± 1.2 m/s
Physical characteristics
Mass	(m)	>1.9 MJ
Discovery information
Discovery date		2007
Discoverer(s)		Naef et al.
Detection method		HARPS
Discovery site		Chile
Discovery status		Published

HD 190647 b is a 3.6 wekagram planet orbiting the star at 309.7 gigameters or 10.04 μpc away from the star, taking 89.69 megaseconds to orbit the star with average velocity of 21.6 km/s. The orbital eccentricity is 18%. Naef discovered his planet in early 2007 by using HARPS spectrograph located in Chile.

[edit] References

• D. Naef, M. Mayor, W. Benz, F. Bouchy, G. Lo Curto, C. Lovis, C. Moutou, F. Pepe, D. Queloz, N. C. Santos, and S. Udry (2007). "[http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2007/29/aa7361-07/aa7361-07.html The HARPS search for southern extra-solar planets

IX. Exoplanets orbiting HD 100777 , HD 190647 , and HD 221287]". Astronomy & Astrophysics 470: 721-726. 

[edit] External links

• Notes for star HD 190647
• Notes for planet HD 190647 b
• SIMBAD: HD 190647 SIMBAD Query result
• SIMBAD Query result planet