Star · A1
51 Sgr
51 Sgr is a main-sequence star of spectral type A1 in the constellation Sagittarius, 264.8 light-years from the Sun.
| Other names | HIP 96406 |
|---|---|
| Constellation | Sagittarius |
| Distance | 264.8 light-years (81.2 pc) |
| Apparent magnitude | magnitude 5.64 |
| Absolute magnitude | magnitude 1.09 |
| Spectral type | A1 |
| Surface temperature | 8,280 K |
| Luminosity | 34 L☉ |
| Radius | 2.83 R☉ |
| Mass | 2.49 M☉ (estimated) |
| Right ascension (J2000) | 19h 36m 01.7s |
| Declination (J2000) | −24° 43′ 09″ |
| Space velocity (relative to the Sun) | 22.7 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 65° N. South of latitude 65° S it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1761. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.7 million years.
The Sun seen from there
From a planet around 51 Sgr, the Sun would look like a star of magnitude 9.38, in the direction where our sky has the constellation Gemini. 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.