HD 128717
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco[1] |
| Right ascension | 14h 36m 21.3187s[2] |
| Declination | +57° 33′ 38.382″[2] |
| Apparent magnitude (V) | 8.29±0.01[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F8[4] |
| Astrometry | |
| Radial velocity (Rv) | −4.851±0.004[5] km/s |
| Proper motion (μ) | RA: −82.125 mas/yr[2] Dec.: +67.259 mas/yr[2] |
| Parallax (π) | 13.5609±0.0216 mas[2] |
| Distance | 240.5 ± 0.4 ly (73.7 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.16[6] |
| Orbit[7] | |
| Period (P) | 9.37+0.06 −0.05 years |
| Semi-major axis (a) | 4.85+0.02 −0.01 au |
| Eccentricity (e) | 0.850±0.002 |
| Inclination (i) | 130.3+1.6 −1.9° |
| Longitude of the node (Ω) | 131.7+3.3 −3.4° |
| Periastron epoch (T) | 2023.6716±0.0009 |
| Argument of periastron (ω) (secondary) | −105.7+0.4 −0.3° |
| Details[7] | |
| A | |
| Mass | 1.212+0.058 −0.068 M☉ |
| Radius | 1.248±0.024 R☉ |
| Luminosity | 2.10±0.07 L☉ |
| Surface gravity (log g) | 4.329+0.025 −0.030 cgs |
| Temperature | 6,210±40 K |
| Metallicity [Fe/H] | +0.16±0.08 dex |
| Rotation | 7.8±0.6 days |
| Rotational velocity (v sin i) | 6.1±0.5 km/s |
| Age | 1.4±0.3 Gyr |
| B | |
| Mass | 19.8±0.5 MJup |
| Other designations | |
| BD+58°1514, HD 128717, HIP 71425, TYC 3866-1234-1[8] | |
| Database references | |
| SIMBAD | data |
HD 128717 is a star in the constellation of Draco. With an apparent magnitude of +8.29, it is too faint to be seen with the naked eye. Parallax measurements by the Gaia spacecraft imply a distance of 240 light-years (73.7 parsecs). It is moving towards the Solar System at a velocity of 4.851 km/s.
With a spectral class of F8,[4] HD 128717 is a late-type F-type star. It is estimated to be 1.4 billion years old, has 1.21 times the mass of the Sun and 1.25 times the radius. It radiates 2.1 times the Sun's luminosity from its photosphere at an effective temperature of 6,210 K,[7] giving it the typical yellowish-white hue of a late-type F-type star.[9]
The space velocity components of HD 128717 are U =−30, V=−10 and W=−4km/s. It is orbiting the Milky Way galaxy with an orbital eccentricity of 0.06. Its distance from the Galactic Center varies between 7.40 kiloparsecs (24.1 kilolight-years) and 8.38 kpc (27.3 kly). This orbit lies close to the galactic plane, and the star travels no more than 70 parsecs (230 light-years) above or below this plane.[10]
