HD 156846
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Stern HD 156846 |
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| AladinLite | |||||||||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | Snake bearer | ||||||||||
| Right ascension | 17 h 20 m 34.31 s | ||||||||||
| declination | -19 ° 20 ′ 1.5 ″ | ||||||||||
| Apparent brightness | 6.5 mag | ||||||||||
| Typing | |||||||||||
| B − V color index | +0.58 | ||||||||||
| Spectral class | G1 V | ||||||||||
| Astrometry | |||||||||||
| Radial velocity | (−68.6 ± 0.3) km / s | ||||||||||
| parallax | (21.00 ± 0.51) mas | ||||||||||
| distance | (155 ± 4) ly (48 ± 1) pc |
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| Visual absolute brightness M vis | +3.1 mag | ||||||||||
| Proper movement | |||||||||||
| Rec. Share: | (−136.65 ± 0.61) mas / a | ||||||||||
| Dec. portion: | (−144.25 ± 0.29) mas / a | ||||||||||
| Physical Properties | |||||||||||
| Dimensions | 1.43 M ☉ | ||||||||||
| Effective temperature | 6138 K | ||||||||||
| Metallicity [Fe / H] | 0.22 | ||||||||||
| Age | 2.1 · 10 9 a | ||||||||||
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Other names and catalog entries |
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HD 156846 is a yellow dwarf in the constellation Ophiuchus. It has an apparent magnitude of 6.5 mag.
In 2007, Omer Tamuz discovered, using the radial velocity method, a substellar companion that orbits this star and bears the systematic name HD 156846 b . The orbital period of the companion is around 360 days and its major semi-axis measures approximately one astronomical unit , but with an uncertainty between 0.15 and 1.83 AU. Since the orbital inclination of the object to the central star is also not known, one can only estimate its minimum mass. This is 10.5 masses of Jupiter. Since this only corresponds exactly in the (unlikely) case, if we were to look directly at the polar plane of the system, the real mass of the object should be significantly higher, so it should probably be a brown dwarf, but it still remains that Possibility of an exoplanet open. If the actual semi-major axis of HD 156846 b lies in the outer area of the above-mentioned uncertainty zone, the object would even be in the habitable zone of its central star with some certainty.