Star · F0IV
λ CrB
λ CrB is a subgiant star of spectral type F0IV in the constellation Corona Borealis, 137.2 light-years from the Sun.
| Other names | GJ 9531 · HIP 78012 |
|---|---|
| Constellation | Corona Borealis |
| Distance | 137.2 light-years (42.1 pc) |
| Apparent magnitude | magnitude 5.43 |
| Absolute magnitude | magnitude 2.31 |
| Spectral type | F0IV |
| Surface temperature | 7,150 K |
| Luminosity | 10.2 L☉ |
| Radius | 2.08 R☉ |
| Mass | 1.79 M☉ (estimated) |
| Right ascension (J2000) | 15h 55m 47.6s |
| Declination (J2000) | +37° 56′ 49″ |
| Space velocity (relative to the Sun) | 20.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.43). Visible from the whole Northern Hemisphere and south to latitude 52° S. North of latitude 52° 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 1889. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
The Sun seen from there
From a planet around λ CrB, the Sun would look like a star of magnitude 7.95, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- PSO J241.1376+39.0369 11.0 light-years
- HIP 76897 14.1 light-years
- Gl 612.1 16.0 light-years
- HIP 78550 16.3 light-years
- HIP 78074 17.0 light-years
- SDSS J161731.65+401859.7 17.2 light-years
- HIP 78680 17.4 light-years
- SDSS J155120.86+432930.3 17.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.