Extrasolar Planets
Encyclopaedia | data
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HD 176051 is a
spectroscopic binary
A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved as separate stars us ...
star system
approximately 49
light year
A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distance, astronomical distances and is equal to exactly , which is approximately 9.46 trillion km or 5.88 trillion mi. As defined by t ...
s away from
Earth
Earth is the third planet from the Sun and the only astronomical object known to Planetary habitability, harbor life. This is enabled by Earth being an ocean world, the only one in the Solar System sustaining liquid surface water. Almost all ...
in the constellation
Lyra
, from ; pronounced: ) is a small constellation. It is one of the 48 listed by the 2nd century astronomer Ptolemy, and is one of the modern 88 constellations recognized by the International Astronomical Union. Lyra was often represented on star ...
. The pair orbit with a period of 22,423 days (61.4 years) and an
eccentricity
Eccentricity or eccentric may refer to:
* Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal"
Mathematics, science and technology Mathematics
* Off-Centre (geometry), center, in geometry
* Eccentricity (g ...
of 0.25.
Compared to the Sun, they have a somewhat lower proportion of elements more massive than helium.
Their individual masses are estimated at 1.07 and 0.71
solar mass
The solar mass () is a frequently used unit of mass in astronomy, equal to approximately . It is approximately equal to the mass of the Sun. It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxie ...
es ().
The system is moving closer to the Sun with a
radial velocity
The radial velocity or line-of-sight velocity of a target with respect to an observer is the rate of change of the vector displacement between the two points. It is formulated as the vector projection of the target-observer relative velocity ...
of −47
km/s and will reach
perihelion
An apsis (; ) is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values.
Apsides perta ...
in about 269,000 years when it comes within roughly of the Sun.
Planetary system
A planet orbiting one of the stars was discovered through astrometric observations. However, it is not known which stellar component the planet is orbiting around.
The planet parameters are given here for the component B.
But, if instead the planet is orbiting the component A, its mass is 2.26 with a semimajor axis of 2.02 AU.
See also
*
List of star systems within 45–50 light-years
This is a list of star systems within 45–50 light years of Earth.
List
See also
*Lists of stars
* List of star systems within 40–45 light-years
* List of star systems within 50–55 light-years
*List of nearest stars and brown dwarfs
...
*
Alpha Centauri
Alpha Centauri (, α Cen, or Alpha Cen) is a star system in the southern constellation of Centaurus (constellation), Centaurus. It consists of three stars: Rigil Kentaurus (), Toliman (), and Proxima Centauri (). Proxima Centauri ...
*
Gamma Cephei
Gamma Cephei (γ Cephei, abbreviated Gamma Cep, γ Cep) is a binary star system approximately 45 light-years away in the northern constellation of Cepheus (constellation), Cepheus. The primary (designated Gamma Cephei A, officially name ...
References
External links
HD 176051 b on The Extrasolar Planets EncyclopaediaCandidate substellar companions of binary systems
{{Stars of Lyra
Lyra
G-type main-sequence stars
K-type main-sequence stars
HD, 176051
Spectroscopic binaries
176051
093017
7162
0738
Planetary systems with one confirmed planet