HD 30856

HD 30856 / Mouhoun
Location of HD 30856 (circled)
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]
Distance429 ± 1 ly
(131.6 ± 0.3 pc)
Orbit[4]
PrimaryHD 30856 A
CompanionHD 30856 B
Semi-major axis (a)0.786″
Details
HD 30856 A
Mass1.17[5] / 1.35[4] M☉
Radius4.40[5] R☉
Luminosity9.9±0.5[6] L☉
Surface gravity (log g)3.20[5] cgs
Temperature4895[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
Mass0.54±0.01[4] M☉
Surface gravity (log g)4.7[4] cgs
Temperature3700–4150[4] 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[1]
Database references
SIMBADdata

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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