Star · G0I
HIP 3649
HIP 3649 is a supergiant star of spectral type G0I in the constellation Cassiopeia, 2,171 light-years from the Sun.
| Constellation | Cassiopeia |
|---|---|
| Distance | 2,171 light-years (665.7 pc) |
| Apparent magnitude | magnitude 6.41 |
| Absolute magnitude | magnitude −2.71 |
| Spectral type | G0I |
| Surface temperature | 4,560 K |
| Luminosity | 1,820 L☉ |
| Radius | 68.5 R☉ |
| Mass | 7.76 M☉ (estimated) |
| Right ascension (J2000) | 0h 46m 42.5s |
| Declination (J2000) | +59° 34′ 28″ |
| Space velocity (relative to the Sun) | 25.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.41). Visible from the whole Northern Hemisphere and south to latitude 30° S. North of latitude 30° N it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 146 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 39 million years.
The Sun seen from there
From a planet around HIP 3649, the Sun would look like a star of magnitude 13.95, in the direction where our sky has the constellation Crux. 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.