Star · B7IV
η¹ TrA
η¹ TrA is a subgiant star of spectral type B7IV in the constellation Triangulum Australe, 749.2 light-years from the Sun.
| Other names | HIP 81710 |
|---|---|
| Constellation | Triangulum Australe |
| Distance | 749.2 light-years (229.7 pc) |
| Apparent magnitude | magnitude 5.89 |
| Absolute magnitude | magnitude −0.92 |
| Spectral type | B7IV |
| Surface temperature | 11,220 K |
| Luminosity | 333 L☉ |
| Radius | 4.83 R☉ |
| Mass | 4.78 M☉ (estimated) |
| Right ascension (J2000) | 16h 41m 23.1s |
| Declination (J2000) | −68° 17′ 46″ |
| Space velocity (relative to the Sun) | 47.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.89). Visible from the whole Southern Hemisphere and north to latitude 22° N. South of latitude 22° S 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 1277. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
The Sun seen from there
From a planet around η¹ TrA, the Sun would look like a star of magnitude 11.64, in the direction where our sky has the constellation Camelopardalis. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.