| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h 10m 47.22139s[1] |
| Declination | −66° 11′ 17.3901″[1] |
| Apparent magnitude (V) | +8.06[2] |
| Characteristics | |
| Spectral type | K1IV[3] |
| B−Vcolor index | 0.849±0.012[2] |
| Astrometry | |
| Radial velocity (Rv) | +5.63±0.15[2] km/s |
| Proper motion (μ) | RA: +110.513[1]mas/yr Dec.: −123.283[1]mas/yr |
| Parallax (π) | 27.6312±0.0276 mas[1] |
| Distance | 118.0 ± 0.1 ly (36.19 ± 0.04 pc) |
| Absolute magnitude (MV) | 5.32[2] |
| Details[4] | |
| Mass | 0.93±0.02 M☉ |
| Radius | 0.98±0.02 R☉ |
| Luminosity | 0.70±0.01 L☉ |
| Surface gravity (log g) | 4.42±0.03 cgs |
| Temperature | 5,349±38 K |
| Metallicity[Fe/H] | +0.39±0.106[5] dex |
| Rotation | 42.89±4.66[6] d |
| Rotational velocity (v sin i) | 2.209±0.327[5] km/s |
| Age | 9.5±2.4 Gyr |
| Other designations | |
| Emiw,CD−66°60,Gaia DR2 4704957491028733824,HD 7199,HIP 5529,SAO 248334,2MASS J01104719-6611171[7] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 7199 is astar in theconstellationTucana located 118 light years distance from theSun based onparallax. It has an orange hue but is too dim to be viewed with the naked eye, having anapparent visual magnitude of +8.06.[2] The star is drifting further away from the Sun with aradial velocity of +5.6 km/s.[2]
The star HD 7199 is namedEmiw. The name was selected in theNameExoWorlds campaign byMozambique, during the 100th anniversary of theIAU. Emiw representslove in the localMakhuwa language.[8][9]
This object has astellar classification of K1IV,[3] matching aK-typesubgiant star that is in the process of cooling and expanding off themain sequence, having exhausted the supply of hydrogen at itscore. It is around 10[4] billion years old with a lowprojected rotational velocity of 2.2 km/s.[5] The star looks to be verymetal-rich, having more than double the abundance of iron compared to the Sun.[5] Both mass and radius are lower than the Sun's, and it only radiates 70% of the Sun's luminosity.[4] It displays a Sun-likemagnetic activity cycle.[6]
TheHigh Accuracy Radial Velocity Planet Searcher (HARPS) in Chile found it to have a planet with a minimum of 0.29 times themass of Jupiter – 92 times themass of Earth – with anorbital period of 615 days.[6]
The planet HD 7199 b was namedHairu in 2019. Hairu represents unity in theMakhuwa language.[8][9]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| HD 7199 b (Hairu) | >0.29±0.023 MJ | 1.36±0.02 | 615±7 | 0.36±0.12 | — | — |
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