Star · F3III
45 Oph
45 Oph is a giant star of spectral type F3III in the constellation Ophiuchus, 112.0 light-years from the Sun.
| Other names | HIP 85423 |
|---|---|
| Constellation | Ophiuchus |
| Distance | 112.0 light-years (34.3 pc) |
| Apparent magnitude | magnitude 4.28 |
| Absolute magnitude | magnitude 1.60 |
| Spectral type | F3III |
| Surface temperature | 6,870 K |
| Luminosity | 19.4 L☉ |
| Radius | 3.11 R☉ |
| Mass | 2.12 M☉ (estimated) |
| Right ascension (J2000) | 17h 27m 21.3s |
| Declination (J2000) | −29° 52′ 02″ |
| Space velocity (relative to the Sun) | 44.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.28). Visible from the whole Southern Hemisphere and north to latitude 60° N. South of latitude 60° 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 1914. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.0 million years.
The Sun seen from there
From a planet around 45 Oph, the Sun would look like a star of magnitude 7.51, in the direction where our sky has the constellation Auriga. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.