HD 30856
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 50m 17.8614408264s |
| Declination | −24° 22′ 07.833769068″ |
| Apparent magnitude (V) | 7.911 |
| Characteristics | |
| Evolutionary stage | Red-giant branch star |
| Spectral type | K0III |
| B−V color index | 0.961 |
| Astrometry | |
| Radial velocity (Rv) | 35.71 km/s |
| Proper motion (μ) | RA: 18.469 mas/yr Dec.: −19.837 mas/yr |
| Parallax (π) | 7.5965±0.0179 mas |
| Distance | 429 ± 1 ly (131.6 ± 0.3 pc) |
| Orbit | |
| Primary | HD 30856 A |
| Companion | HD 30856 B |
| Semi-major axis (a) | 0.786″ |
| Details | |
| HD 30856 A | |
| Mass | 1.17 / 1.35 M☉ |
| Radius | 4.40 R☉ |
| Luminosity | 9.9±0.5 L☉ |
| Surface gravity (log g) | 3.20 cgs |
| Temperature | 4895 / 4982 ± 44 K |
| Metallicity [Fe/H] | −0.06±0.03 dex |
| Rotational velocity (v sin i) | 2.85 km/s |
| HD 30856 B | |
| Mass | 0.54±0.01 M☉ |
| Surface gravity (log g) | 4.7 cgs |
| Temperature | 3700–4150 K |
| Other designations | |
| CD−24 2616, Gaia DR3 4893980371818915456, HD 30856, HIP 22491, SAO 169805, TIC 612908, TYC 6466-1769-1, GSC 06466-01769, 2MASS J04501787-2422077 | |
| Database references | |
| SIMBAD | data |
HD 30856 (proper name Mouhoun) is a binary system between HD 30856 A (often simply HD 30856), a K-type giant star, and HD 30856 B, a red dwarf companion, located in the constellation of Eridanus about 430 light-years distant. A super-Jupiter exoplanet, HD 30856 b (proper name Nakanbé), is known to orbit the primary star.