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HD 118203

HD 118203 / Liesma
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 13h 34m 02.5394s[1]
Declination +53° 43′ 42.698″[1]
Apparent magnitude (V) 8.06[2]
Characteristics
Spectral type G0V[3]
B−V color index 0.699±0.012[4]
Astrometry
Radial velocity (Rv)−29.37±0.13[1] km/s
Proper motion (μ) RA: −85.849(18) mas/yr[1]
Dec.: −78.888(20) mas/yr[1]
Parallax (π)10.8643 ± 0.0180 mas[1]
Distance300.2 ± 0.5 ly
(92.0 ± 0.2 pc)
Absolute magnitude (MV)3.32[2]
Details[5]
Mass1.353±0.006 M☉
Radius1.993±0.065 R☉
Luminosity4.42±0.02 L☉
Surface gravity (log g)4.05±0.04 cgs
Temperature5,872±20 K
Metallicity [Fe/H]0.27±0.02 dex
Rotational velocity (v sin i)7.0[2] km/s
Age5.4±0.5[6] Gyr
Other designations
Liesma, BD+54°1609, HD 118203, HIP 66192, SAO 28802, TOI-1271, TIC 286923464, TYC 3850-458-1[7]
Database references
SIMBADThe star
planet b
Exoplanet Archivedata

HD 118203 is a star with an orbiting exoplanet located in the northern circumpolar constellation of Ursa Major. It has the proper name Liesma, which means flame, and it is the name of a character from the Latvian poem Staburags un Liesma (Staburags and Liesma). The name was selected in the NameExoWorlds campaign by Latvia, during the 100th anniversary of the IAU.[8][9]

The apparent visual magnitude of HD 118203 is 8.06,[2] which means it is invisible to the naked eye but it can be seen using binoculars or a telescope. Based on parallax measurements, it is located at a distance of 300 light years from the Sun.[1] The star is drifting closer with a radial velocity of −29 km/s.[4] Based on its position and space velocity this is most likely (97% chance) an older thin disk star.[10] An exoplanet has been detected in a close orbit around the star.[11]

The spectrum of HD 118203 matches a G-type main-sequence star with a class of G0V.[3] It has a low level of chromospheric activity, which means a low level of radial velocity jitter for planet detection purposes.[11] The star has 1.23[6] times the mass of the Sun and double the Sun's radius. It is around 5.4 billion years old and is spinning with a projected rotational velocity of 7.0 km/s.[2] HD 118203 is radiating 3.8 times the luminosity of the Sun from its photosphere at an effective temperature of 5,741 K.[6]

  1. ^ a b c d e f Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Earle2017 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Grieves_et_al_2018 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Castro-González2024 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Bonfanti_et_al_2015 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. ^ Cite error: The named reference nameexoworlds was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference IAU was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Pepper_et_al_2020 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference daSilva_et_al_2006 was invoked but never defined (see the help page).

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