HD 7199

HD 7199 / Emiw
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−V color 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]
Distance118.0 ± 0.1 ly
(36.19 ± 0.04 pc)
Absolute magnitude (MV)5.32[2]
Details[4]
Mass0.93±0.02 M☉
Radius0.98±0.02 R☉
Luminosity0.70±0.01 L☉
Surface gravity (log g)4.42±0.03 cgs
Temperature5,349±38 K
Metallicity [Fe/H]+0.39±0.106[5] dex
Rotation42.89±4.66[6] d
Rotational velocity (v sin i)2.209±0.327[5] km/s
Age9.5±2.4 Gyr
Other designations
Emiw, CD−66°60, Gaia DR2 4704957491028733824, HD 7199, HIP 5529, SAO 248334, 2MASS J01104719-6611171[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 7199 is a star in the constellation Tucana located 118 light years distance from the Sun based on parallax. It has an orange hue but is too dim to be viewed with the naked eye, having an apparent visual magnitude of +8.06.[2] The star is drifting further away from the Sun with a radial velocity of +5.6 km/s.[2]

The star HD 7199 is named Emiw. The name was selected in the NameExoWorlds campaign by Mozambique, during the 100th anniversary of the IAU. Emiw represents love in the local Makhuwa language.[8][9]

This object has a stellar classification of K1IV,[3] matching a K-type subgiant star that is in the process of cooling and expanding off the main sequence, having exhausted the supply of hydrogen at its core. It is around 10[4] billion years old with a low projected rotational velocity of 2.2 km/s.[5] The star looks to be very metal-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-like magnetic activity cycle.[6]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Bonfanti2015 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Soto2018 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference HARPSXXX was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  9. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.