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