Star · K2
HD 156668
HD 156668 is a main-sequence star of spectral type K2 in the constellation Hercules, 79.3 light-years from the Sun. It is orbited by 2 confirmed exoplanet(s).
| Other names | HIP 84607 |
|---|---|
| Constellation | Hercules |
| Distance | 79.3 light-years (24.3 pc) |
| Apparent magnitude | magnitude 8.43 |
| Absolute magnitude | magnitude 6.50 |
| Spectral type | K2 |
| Surface temperature | 4,900 K |
| Luminosity | 0.288 L☉ |
| Radius | 0.775 R☉ |
| Mass | 0.785 M☉ |
| Age | 8.6 billion years |
| Metallicity [Fe/H] | 0.05 |
| Right ascension (J2000) | 17h 17m 40.5s |
| Declination (J2000) | +29° 13′ 38″ |
| Space velocity (relative to the Sun) | 51.9 km/s |
In the sky
Too faint for the naked eye (magnitude 8.43); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 61° S. North of latitude 61° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1947. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.4 million years.
The Sun seen from there
From a planet around HD 156668, the Sun would look like a star of magnitude 6.76, in the direction where our sky has the constellation Columba. It would be invisible to the naked eye.
Planets
- HD 156668 b 4.65-day orbit · 1.87 R⊕
- HD 156668 c 811-day orbit · 6.17 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 677A 3.94 light-years
- Gl 677B 4.23 light-years
- Sarin 6.55 light-years
- Gl 679 8.15 light-years
- WISEPA J171104.60+350036.8 8.96 light-years
- 2MASS J17392515+2454421 9.01 light-years
- GJ 4019B 9.54 light-years
- GJ 3983 9.80 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.