Star · G5 V
HD 154857
HD 154857 is a main-sequence star of spectral type G5 V in the constellation Ara, 206.2 light-years from the Sun. It is orbited by 2 confirmed exoplanet(s).
| Other names | HIP 84069 |
|---|---|
| Constellation | Ara |
| Distance | 206.2 light-years (63.2 pc) |
| Apparent magnitude | magnitude 7.24 |
| Absolute magnitude | magnitude 3.24 |
| Spectral type | G5 V |
| Surface temperature | 5,610 K |
| Luminosity | 4.6 L☉ |
| Radius | 1.76 R☉ |
| Mass | 1.72 M☉ |
| Age | 5.6 billion years |
| Metallicity [Fe/H] | -0.20 |
| Right ascension (J2000) | 17h 11m 15.7s |
| Declination (J2000) | −56° 40′ 51″ |
| Space velocity (relative to the Sun) | 41.9 km/s |
In the sky
Too faint for the naked eye (magnitude 7.24); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 33° N. South of latitude 33° S 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 1820. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.7 million years.
The Sun seen from there
From a planet around HD 154857, the Sun would look like a star of magnitude 8.83, in the direction where our sky has the constellation Camelopardalis. It would be invisible to the naked eye.
Planets
- HD 154857 b 409-day orbit · 13.3 R⊕
- HD 154857 c 3,450-day orbit · 13.2 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HD 154672 1.02 light-years
- HIP 83312 7.12 light-years
- HIP 84229 14.1 light-years
- HIP 85038 17.3 light-years
- HIP 84642 17.7 light-years
- HIP 81749 18.4 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.