HD 177830
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Stern HD 177830 |
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| AladinLite | |||||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | lyre | ||||||||||||
| Right ascension | 19 h 05 m 20.77 s | ||||||||||||
| declination | + 25 ° 55 ′ 14.4 ″ | ||||||||||||
| Apparent brightness | 7.18 likes | ||||||||||||
| Typing | |||||||||||||
| Spectral class | K0 | ||||||||||||
| Astrometry | |||||||||||||
| Radial velocity | (−72.3 ± 0.1) km / s | ||||||||||||
| parallax | (16.94 ± 0.63) mas | ||||||||||||
| distance | (192.5 ± 7.2) ly (59.0 ± 2.2) pc |
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| Visual absolute brightness M vis | +3.32 mag | ||||||||||||
| Proper movement | |||||||||||||
| Rec. Share: | (−40.84 ± 0.38) mas / a | ||||||||||||
| Dec. portion: | (−51.75 ± 0.57) mas / a | ||||||||||||
| Physical Properties | |||||||||||||
| Dimensions | 1.5 M ☉ | ||||||||||||
| radius | (3.0 ± 0.4) R ☉ | ||||||||||||
| Luminosity |
4.8 L ☉ |
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| Effective temperature | 4900 K | ||||||||||||
| Metallicity [Fe / H] | approx. 0.0 | ||||||||||||
| Age | 4 · 10 9 a | ||||||||||||
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Other names and catalog entries |
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HD 177830 is a sub-giant of spectral class K0 about 190 light-years from Earth . It has an apparent magnitude of 7.2 mag. HD 177830 has a spectroscopic companion with the systematic name HD 177830 b , which could be an exoplanet or a brown dwarf. The object has an orbital period of approx. 400 days and a minimum mass of only approx. 1.3 Jupiter masses and a major semi-axis of approx. 1 astronomical unit . It was suggested by Vogt et al. discovered.