HD 70573
HD 70573 is a variable star in the equatorial constellation of Hydra. At a mean apparent visual magnitude of +8.7, this yellow-hued star is too dim to be visible to the naked eye. Based upon parallax measurements, it is located at a distance of 193 light years from the Sun, and is drifting further away with a radial velocity of 20.5 km/s. It is a candidate member of the proposed Hercules-Lyra Association of co-moving stars, although this membership is disputed.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 22m 49.95277s |
| Declination | +01° 51′ 33.5522″ |
| Apparent magnitude (V) | 8.66-8.77 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G1/2V |
| B−V color index | 0.59 |
| Variable type | BY Dra |
| Astrometry | |
| Radial velocity (Rv) | 20.16±0.22 km/s |
| Proper motion (μ) | RA: −51.362±0.017 mas/yr Dec.: −49.047±0.013 mas/yr |
| Parallax (π) | 16.9267 ± 0.0168 mas |
| Distance | 192.7 ± 0.2 ly (59.08 ± 0.06 pc) |
| Absolute magnitude (MV) | +0.4 |
| Details | |
| Mass | 1.0±0.1 M☉ |
| Radius | 0.98+0.01 −0.03 R☉ |
| Luminosity | 0.998±0.004 L☉ |
| Surface gravity (log g) | 4.59±0.10 cgs |
| Temperature | 5,837+80 −51 K |
| Metallicity [Fe/H] | −0.18±0.20 dex |
| Rotation | 3.296 days |
| Rotational velocity (v sin i) | 14.7±1.0 km/s |
| Age | 2.3±2.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a G-type main-sequence star with a stellar classification of G1/2V. It is a BY Draconis variable that ranges in brightness from magnitude 8.66 down to 8.77 with a rotationally-modulated period of 3.296 days. HD 70573 is generally considered to be a young star although estimates of its age vary from 60 million years to several billion years. It has a projected rotational velocity of 15 km/s and about the same mass, size, and luminosity as the Sun.