Star · K4III
ζ¹ Lib
ζ¹ Lib is a giant star of spectral type K4III in the constellation Libra, 645.5 light-years from the Sun.
| Other names | HIP 75730 |
|---|---|
| Constellation | Libra |
| Distance | 645.5 light-years (197.9 pc) |
| Apparent magnitude | magnitude 5.64 |
| Absolute magnitude | magnitude −0.84 |
| Spectral type | K4III |
| Surface temperature | 3,730 K |
| Luminosity | 749 L☉ |
| Radius | 65.6 R☉ |
| Mass | 6.02 M☉ (estimated) |
| Right ascension (J2000) | 15h 28m 15.4s |
| Declination (J2000) | −16° 42′ 59″ |
| Space velocity (relative to the Sun) | 42.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.64). Visible from the whole Southern Hemisphere and north to latitude 73° N. South of latitude 73° S it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1380. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 11 million years.
The Sun seen from there
From a planet around ζ¹ Lib, the Sun would look like a star of magnitude 11.31, in the direction where our sky has the constellation Taurus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.