HD 20003
Star in the constellation Hydrus / From Wikipedia, the free encyclopedia
HD 20003 is a star in the southern constellation Hydrus. With an apparent visual magnitude of 8.39,[2] this yellow-hued star is much too faint to be visible to the naked eye. It is located at a distance of 136.6 light years from the Sun based on parallax. HD 20003 is drifting closer with a radial velocity of −16 km/s,[1] and is predicted to come to within 97 light-years in around 1.4 million years from now.[2]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Hydrus |
Right ascension | 03h 07m 37.91875s[1] |
Declination | −72° 19′ 18.8010″[1] |
Apparent magnitude (V) | 8.39[2] |
Characteristics | |
Spectral type | G8 V[3] |
B−V color index | 0.771±0.015[2] |
Astrometry | |
Radial velocity (Rv) | −16.174±0.0005[1] km/s |
Proper motion (μ) | RA: +71.893[1] mas/yr Dec.: −7.995[1] mas/yr |
Parallax (π) | 23.8764 ± 0.0283 mas[1] |
Distance | 136.6 ± 0.2 ly (41.88 ± 0.05 pc) |
Absolute magnitude (MV) | 5.18[2] |
Details | |
Mass | 0.942±0.046[4] M☉ |
Radius | 0.92+0.05 −0.01[1] R☉ |
Luminosity | 0.705+0.002 −0.001[1] L☉ |
Surface gravity (log g) | 4.423±0.323[4] cgs |
Temperature | 5494±27[5] K |
Metallicity [Fe/H] | +0.04±0.02[5] dex |
Rotation | 38.9±4 d[5] |
Rotational velocity (v sin i) | 2.216±0.273[4] km/s |
Age | 5.3+2.8 −2.6[4] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Exoplanet Archive | data |
This object is an ordinary, G-type main-sequence star with a stellar classification of G8 V.[3] It is around five[4] billion years old with a magnetic activity cycle lasting about ten years[7] and a projected rotational velocity of 2.2 km/s.[4] The star has 94%[4] of the mass of the Sun and 92%[1] of the Sun's radius. The metallicity of this star is similar to the Sun, if slightly higher.[2] It is radiating 70.5% of the luminosity of the Sun from its photosphere at an effective temperature of 5,510 K.[1]
The survey in 2015 have ruled out the existence of any stellar companions at projected distances above 18 astronomical units.[8]