HD 122430
Stern HD 122430 |
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AladinLite | |||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Water snake | ||||||||||
Right ascension | 14 h 02 m 22.8 s | ||||||||||
declination | -27 ° 25 ′ 47 ″ | ||||||||||
Apparent brightness | 5.47 likes | ||||||||||
Typing | |||||||||||
Known exoplanets | 1 | ||||||||||
B − V color index | +1.34 | ||||||||||
U − B color index | +1.44 | ||||||||||
Spectral class | K2 II / K3 III | ||||||||||
Astrometry | |||||||||||
parallax | (7.42 ± 0.33) mas | ||||||||||
distance | (440 ± 20) ly (134.8 ± 6.0) pc |
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Visual absolute brightness M vis | approx. −0.2 mag | ||||||||||
Proper movement | |||||||||||
Rec. Share: | (−31.96 ± 0.40) mas / a | ||||||||||
Dec. portion: | (−4.05 ± 0.28) mas / a | ||||||||||
Physical Properties | |||||||||||
Dimensions | approx. 1.4 M ☉ | ||||||||||
radius | approx. 23 R ☉ | ||||||||||
Effective temperature | 4300 K | ||||||||||
Metallicity [Fe / H] | −0.05 | ||||||||||
Age | approx. 3 billion a | ||||||||||
Other names and catalog entries |
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HD 122430 is a giant of spectral class K in the constellation Hydra, about 440 light years from Earth . It has an apparent magnitude of 5.5 mag. In 2003 Setiawan et al. the discovery of an extrasolar planet orbiting this star, systematically named HD 122430 b . The orbital period of the companion found with the help of the radial velocity method is around 345 days and the major semi-axis of its orbit measures approximately one astronomical unit .