HD 7199
| Observation data EpochJ2000.0EquinoxJ2000.0 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h10m47.22139s[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 ± 0.0276mas[1] |
| Distance | 118.0 ± 0.1ly (36.19 ± 0.04pc) |
| Absolute magnitude(MV) | 5.32[2] |
| Details[4] | |
| Mass | 0.93±0.02M☉ |
| Radius | 0.98±0.02R☉ |
| Luminosity | 0.70±0.01L☉ |
| Surface gravity(logg) | 4.42±0.03cgs |
| Temperature | 5,349±38K |
| Metallicity[Fe/H] | +0.39±0.106[5]dex |
| Rotation | 42.89±4.66[6]d |
| Rotational velocity(vsini) | 2.209±0.327[5]km/s |
| Age | 9.5±2.4Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 7199is astarin theconstellationTucanalocated 118light yearsdistance from theSunbased onparallax.It has an orange hue but is too dim to be viewed with the naked eye, having anapparent visual magnitudeof +8.06.[2]The star is drifting further away from the Sun with aradial velocityof +5.6 km/s.[2]
The star HD 7199 is namedEmiw.The name was selected in theNameExoWorldscampaign byMozambique,during the 100th anniversary of theIAU.Emiw representslovein the localMakhuwa language.[8][9]
This object has astellar classificationof K1IV,[3]matching aK-typesubgiant starthat 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 velocityof 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 activitycycle.[6]
Planetary system
[edit]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 periodof 615 days.[6]
The planet HD 7199 b was namedHairuin 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±0.023MJ | 1.36±0.02 | 615±7 | 0.36±0.12 | — | — |
References
[edit]- ^abcdeBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
- ^abcdefAnderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters.38(5): 331.arXiv:1108.4971.Bibcode:2012AstL...38..331A.doi:10.1134/S1063773712050015.S2CID119257644.
- ^abGray, R. O.; et al. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample".The Astronomical Journal.132(1): 161–170.arXiv:astro-ph/0603770.Bibcode:2006AJ....132..161G.doi:10.1086/504637.S2CID119476992.
- ^abcBonfanti, A.; et al. (2015)."Revising the ages of planet-hosting stars".Astronomy and Astrophysics.575.A18.arXiv:1411.4302.Bibcode:2015A&A...575A..18B.doi:10.1051/0004-6361/201424951.S2CID54555839.
- ^abcdSoto, M. G.; Jenkins, J. S. (July 2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue".Astronomy & Astrophysics.615:28.arXiv:1801.09698.Bibcode:2018A&A...615A..76S.doi:10.1051/0004-6361/201731533.S2CID119107228.A76.
- ^abcDumusque, X.; et al. (November 2011)."The HARPS Search for Southern Extra-solar Planets. XXX. Planetary Systems around Stars with Solar-like Magnetic Cycles and Short-term Activity Variation".Astronomy & Astrophysics.535:A55–A66.arXiv:1107.1748.Bibcode:2011A&A...535A..55D.doi:10.1051/0004-6361/201117148.S2CID119192207.Archived fromthe originalon 2015-05-29.Retrieved2013-10-26.
- ^"HD 7199".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2019-11-07.
- ^ab"Approved names".NameExoworlds.Retrieved2020-01-02.
- ^ab"International Astronomical Union | IAU".iau.org.Retrieved2020-01-02.
- ^Planet HD 7199 b on exoplanet.eu
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