Star · K0
HD 177830
HD 177830 is a giant star of spectral type K0 in the constellation Lyra, 203.8 light-years from the Sun. It is orbited by 2 confirmed exoplanet(s).
| Other names | Gl 743.2 · HIP 93746 |
|---|---|
| Constellation | Lyra |
| Distance | 203.8 light-years (62.5 pc) |
| Apparent magnitude | magnitude 7.18 |
| Absolute magnitude | magnitude 3.20 |
| Spectral type | K0 |
| Surface temperature | 4,950 K |
| Luminosity | 4.84 L☉ |
| Radius | 2.62 R☉ |
| Mass | 1.47 M☉ |
| Age | 4.4 billion years |
| Metallicity [Fe/H] | 0.55 |
| Right ascension (J2000) | 19h 05m 20.8s |
| Declination (J2000) | +25° 55′ 14″ |
| Space velocity (relative to the Sun) | 74.9 km/s |
In the sky
Too faint for the naked eye (magnitude 7.18); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 64° S. North of latitude 64° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1822. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.6 million years.
The Sun seen from there
From a planet around HD 177830, the Sun would look like a star of magnitude 8.81, in the direction where our sky has the constellation Canis Major. It would be invisible to the naked eye.
Planets
- HD 177830 c 111-day orbit · 7.87 R⊕
- HD 177830 b 410-day orbit · 13.5 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 93995 3.15 light-years
- HIP 92631 10.6 light-years
- HIP 93933 14.0 light-years
- HIP 94628 14.3 light-years
- HIP 95589 17.8 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.