Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
---|---|
Constellation | Eridanus[2] |
Right ascension | 04h 50m 17.8614408264s[1] |
Declination | −24° 22′ 07.833769068″[1] |
Apparent magnitude (V) | 7.911[1][3] |
Characteristics | |
Evolutionary stage | Red-giant branch star[1] |
Spectral type | K0III[1][3] |
B−V color index | 0.961[1][3] |
Astrometry | |
Radial velocity (Rv) | 35.71[1] km/s |
Proper motion (μ) | RA: 18.469[1] mas/yr Dec.: −19.837[1] mas/yr |
Parallax (π) | 7.5965 ± 0.0179 mas[1] |
Distance | 429 ± 1 ly (131.6 ± 0.3 pc) |
Orbit[4] | |
Primary | HD 30856 A |
Companion | HD 30856 B |
Semi-major axis (a) | 0.786″ |
Details | |
HD 30856 A | |
Mass | 1.17[5] / 1.35[4] M☉ |
Radius | 4.40[5] R☉ |
Luminosity | 9.9±0.5[6] L☉ |
Surface gravity (log g) | 3.20[5] cgs |
Temperature | 4895[5] / 4982 ± 44[4] K |
Metallicity [Fe/H] | −0.06±0.03[6] dex |
Rotational velocity (v sin i) | 2.85[6] km/s |
HD 30856 B | |
Mass | 0.54±0.01[4] M☉ |
Surface gravity (log g) | 4.7[4] cgs |
Temperature | 3700–4150[4] K |
Other designations | |
Database references | |
SIMBAD | data |
HD 30856 (proper name Mouhoun) is a binary system between HD 30856 A (often simply HD 30856[6][7]), a K-type giant star, and HD 30856 B, a red dwarf companion, located in the constellation of Eridanus about 430 light-years distant.[2][1] A super-Jupiter exoplanet, HD 30856 b (proper name Nakanbé), is known to orbit the primary star.[6]
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