Star · M3I
HIP 103828
HIP 103828 is a supergiant star of spectral type M3I in the constellation Cygnus, 1,248 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 1,248 light-years (382.7 pc) |
| Apparent magnitude | magnitude 6.18 |
| Absolute magnitude | magnitude −1.73 |
| Spectral type | M3I |
| Surface temperature | 3,530 K |
| Luminosity | 2,300 L☉ |
| Radius | 128 R☉ |
| Mass | 8.29 M☉ (estimated) |
| Right ascension (J2000) | 21h 02m 24.2s |
| Declination (J2000) | +44° 47′ 28″ |
| Space velocity (relative to the Sun) | 13.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.18). Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 778. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 22 million years.
The Sun seen from there
From a planet around HIP 103828, the Sun would look like a star of magnitude 12.74, in the direction where our sky has the constellation Vela. 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.