HD 187123
Stern HD 187123 |
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AladinLite | |||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | swan | ||||||||||
Right ascension | 19 h 46 m 58.11 s | ||||||||||
declination | + 34 ° 25 ′ 10.3 ″ | ||||||||||
Apparent brightness | 7.83 likes | ||||||||||
Typing | |||||||||||
Known exoplanets | 2 | ||||||||||
Spectral class | G5 V | ||||||||||
Astrometry | |||||||||||
Radial velocity | (−17.1 ± 0.2) km / s | ||||||||||
parallax | (20.72 ± 0.53) mas | ||||||||||
distance | (157 ± 4) ly (48.3 ± 1.2) pc |
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Visual absolute brightness M vis | +4.4 mag | ||||||||||
Proper movement | |||||||||||
Rec. Share: | (+143.18 ± 0.39) mas / a | ||||||||||
Dec. portion: | (−123.91 ± 0.48) mas / a | ||||||||||
Physical Properties | |||||||||||
Dimensions | 1.1 M ☉ | ||||||||||
radius | 1.2 R ☉ | ||||||||||
Effective temperature | 5700 K | ||||||||||
Metallicity [Fe / H] | 0.16 | ||||||||||
Age | approx. 5 bill. a | ||||||||||
Other names and catalog entries |
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HD 187123 is a main sequence star belonging to spectral class G5 , orbited by at least two planets , HD 187123 b and HD 187123 c . Its mass is around 1.1 solar masses . Its two companions were discovered in 1998 through measurements of its radial velocity .