Our website is made possible by displaying online advertisements to our visitors.
Please consider supporting us by disabling your ad blocker.
HD 118203
| 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] |
| Distance | 300.2 ± 0.5 ly (92.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.32[2] |
| Details[5] | |
| Mass | 1.353±0.006 M☉ |
| Radius | 1.993±0.065 R☉ |
| Luminosity | 4.42±0.02 L☉ |
| Surface gravity (log g) | 4.05±0.04 cgs |
| Temperature | 5,872±20 K |
| Metallicity [Fe/H] | 0.27±0.02 dex |
| Rotational velocity (v sin i) | 7.0[2] km/s |
| Age | 5.4±0.5[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | The star |
| planet b | |
| Exoplanet Archive | data |
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]
- ^ a b c d e f Cite error: The named reference
Gaia DR3was invoked but never defined (see the help page). - ^ a b c d e Cite error: The named reference
Earle2017was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Grieves_et_al_2018was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Anderson_Francis_2012was invoked but never defined (see the help page). - ^ Cite error: The named reference
Castro-González2024was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
Bonfanti_et_al_2015was invoked but never defined (see the help page). - ^ Cite error: The named reference
Simbadwas invoked but never defined (see the help page). - ^ Cite error: The named reference
nameexoworldswas invoked but never defined (see the help page). - ^ Cite error: The named reference
IAUwas invoked but never defined (see the help page). - ^ Cite error: The named reference
Pepper_et_al_2020was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
daSilva_et_al_2006was invoked but never defined (see the help page).
Previous Page Next Page
