Star · A4
θ² Sgr
θ² Sgr is a main-sequence star of spectral type A4 in the constellation Sagittarius, 159.0 light-years from the Sun.
| Other names | HIP 98421 |
|---|---|
| Constellation | Sagittarius |
| Distance | 159.0 light-years (48.8 pc) |
| Apparent magnitude | magnitude 5.30 |
| Absolute magnitude | magnitude 1.86 |
| Spectral type | A4 |
| Surface temperature | 8,400 K |
| Luminosity | 17 L☉ |
| Radius | 1.95 R☉ |
| Mass | 2.04 M☉ (estimated) |
| Right ascension (J2000) | 19h 59m 51.4s |
| Declination (J2000) | −34° 41′ 52″ |
| Space velocity (relative to the Sun) | 34.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.30). Visible from the whole Southern Hemisphere and north to latitude 55° N. South of latitude 55° 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 1867. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.8 million years.
The Sun seen from there
From a planet around θ² Sgr, the Sun would look like a star of magnitude 8.27, in the direction where our sky has the constellation Lynx. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 99591 10.1 light-years
- HIP 99642 11.1 light-years
- HIP 97088 11.7 light-years
- HIP 96932 12.2 light-years
- HIP 97531 13.5 light-years
- HD 187085 13.9 light-years
- HIP 97557 14.3 light-years
- HIP 98226 14.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.