Star · M3III
15 Tri
15 Tri is a giant star of spectral type M3III in the constellation Triangulum, 678.4 light-years from the Sun.
| Other names | HIP 12086 |
|---|---|
| Constellation | Triangulum |
| Distance | 678.4 light-years (208.0 pc) |
| Apparent magnitude | magnitude 5.38 |
| Absolute magnitude | magnitude −1.21 |
| Spectral type | M3III |
| Surface temperature | 3,580 K |
| Luminosity | 1,320 L☉ |
| Radius | 94.4 R☉ |
| Mass | 7.07 M☉ (estimated) |
| Right ascension (J2000) | 2h 35m 46.8s |
| Declination (J2000) | +34° 41′ 15″ |
| Space velocity (relative to the Sun) | 55.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.38). Visible from the whole Northern Hemisphere and south to latitude 55° S. North of latitude 55° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1348. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 12 million years.
The Sun seen from there
From a planet around 15 Tri, the Sun would look like a star of magnitude 11.42, in the direction where our sky has the constellation Centaurus. 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.