Star · K0 V
HD 20781
HD 20781 is a main-sequence star of spectral type K0 V in the constellation Fornax, 117.3 light-years from the Sun. It is orbited by 4 confirmed exoplanet(s).
| Other names | HIP 15526 |
|---|---|
| Constellation | Fornax |
| Distance | 117.3 light-years (36.0 pc) |
| Apparent magnitude | magnitude 8.48 |
| Absolute magnitude | magnitude 5.70 |
| Spectral type | K0 V |
| Surface temperature | 5,260 K |
| Luminosity | 0.49 L☉ |
| Radius | 0.834 R☉ |
| Mass | 0.7 M☉ |
| Metallicity [Fe/H] | -0.11 |
| Right ascension (J2000) | 3h 20m 03.0s |
| Declination (J2000) | −28° 47′ 02″ |
| Space velocity (relative to the Sun) | 72.7 km/s |
In the sky
Too faint for the naked eye (magnitude 8.48); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 61° N. South of latitude 61° S it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1909. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.1 million years.
The Sun seen from there
From a planet around HD 20781, the Sun would look like a star of magnitude 7.61, in the direction where our sky has the constellation Corona Borealis. It would be invisible to the naked eye.
Planets
- HD 20781 b 5.31-day orbit · 1.21 R⊕
- HD 20781 c 13.9-day orbit · 2.17 R⊕
- HD 20781 d 29.2-day orbit · 3.25 R⊕
- HD 20781 e 85.5-day orbit · 3.83 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HD 20782 0.30 light-years
- 2MASS J03274091-3148156 7.49 light-years
- 2MASSI J0316451-284852 9.45 light-years
- HIP 14239 10.00 light-years
- 2MASS J03101401-2756452 10.7 light-years
- HIP 13790 13.3 light-years
- HIP 16192 13.4 light-years
- ζ For 14.2 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.