HD 122430
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Stern HD 122430 |
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| AladinLite | |||||||||||
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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 | ||||||||||
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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 .