Star · F8
HD 128717
HD 128717 is a main-sequence star of spectral type F8 in the constellation Draco, 240.5 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 71425 |
|---|---|
| Constellation | Draco |
| Distance | 240.5 light-years (73.7 pc) |
| Apparent magnitude | magnitude 8.32 |
| Absolute magnitude | magnitude 3.98 |
| Spectral type | F8 |
| Surface temperature | 6,210 K |
| Luminosity | 2.1 L☉ |
| Radius | 1.25 R☉ |
| Mass | 1.21 M☉ |
| Age | 1.4 billion years |
| Metallicity [Fe/H] | 0.16 |
| Right ascension (J2000) | 14h 36m 21.3s |
| Declination (J2000) | +57° 33′ 38″ |
| Space velocity (relative to the Sun) | 37.6 km/s |
In the sky
Too faint for the naked eye (magnitude 8.32); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 32° S. North of latitude 32° N it never sets. It stands highest at midnight in April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1785. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.3 million years.
The Sun seen from there
From a planet around HD 128717, the Sun would look like a star of magnitude 9.17, in the direction where our sky has the constellation Horologium. It would be invisible to the naked eye.
Planets
- HD 128717 b 3,420-day orbit · 12.1 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 70088 15.2 light-years
- HIP 71711 18.2 light-years
- HIP 70823 19.0 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.