Star · K2III
κ Oph
κ Oph is a giant star of spectral type K2III in the constellation Ophiuchus, 87.9 light-years from the Sun.
| Other names | HIP 83000 |
|---|---|
| Constellation | Ophiuchus |
| Distance | 87.9 light-years (26.9 pc) |
| Apparent magnitude | magnitude 3.19 |
| Absolute magnitude | magnitude 1.04 |
| Spectral type | K2III |
| Surface temperature | 4,390 K |
| Luminosity | 65.4 L☉ |
| Radius | 14 R☉ |
| Mass | 3 M☉ (estimated) |
| Right ascension (J2000) | 16h 57m 40.1s |
| Declination (J2000) | +9° 22′ 30″ |
| Space velocity (relative to the Sun) | 67.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.19). Visible from the whole Northern Hemisphere and south to latitude 81° S. 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 1938. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.6 million years.
The Sun seen from there
From a planet around κ Oph, the Sun would look like a star of magnitude 6.98, 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):
- GJ 3980 6.44 light-years
- PSO J258.2413+06.7612 7.69 light-years
- 2MASS J16573454+1054233 9.66 light-years
- GJ 1201 12.4 light-years
- WISE J163236.47+032927.3 13.1 light-years
- WISEA J162852.64+160421.0 14.9 light-years
- Gl 640 15.1 light-years
- PSO J246.4222+15.4698 15.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.