Star · K5III
21Nu 2CrB
21Nu 2CrB is a giant star of spectral type K5III in the constellation Corona Borealis, 570.6 light-years from the Sun.
| Other names | HIP 80214 |
|---|---|
| Constellation | Corona Borealis |
| Distance | 570.6 light-years (174.9 pc) |
| Apparent magnitude | magnitude 5.40 |
| Absolute magnitude | magnitude −0.81 |
| Spectral type | K5III |
| Surface temperature | 3,760 K |
| Luminosity | 698 L☉ |
| Radius | 62.3 R☉ |
| Mass | 5.9 M☉ (estimated) |
| Right ascension (J2000) | 16h 22m 29.2s |
| Declination (J2000) | +33° 42′ 12″ |
| Space velocity (relative to the Sun) | 58.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.40). Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N 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 1455. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 10 million years.
The Sun seen from there
From a planet around 21Nu 2CrB, the Sun would look like a star of magnitude 11.04, in the direction where our sky has the constellation Eridanus. 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.