Star · M0III
HIP 40639
HIP 40639 is a giant star of spectral type M0III in the constellation Puppis, 2,775 light-years from the Sun.
| Constellation | Puppis |
|---|---|
| Distance | 2,775 light-years (850.9 pc) |
| Apparent magnitude | magnitude 6.42 |
| Absolute magnitude | magnitude −3.23 |
| Spectral type | M0III |
| Surface temperature | 3,880 K |
| Luminosity | 5,540 L☉ |
| Radius | 165 R☉ |
| Mass | 10.7 M☉ (estimated) |
| Right ascension (J2000) | 8h 17m 46.2s |
| Declination (J2000) | −36° 04′ 03″ |
| Space velocity (relative to the Sun) | 21.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.42). Visible from the whole Southern Hemisphere and north to latitude 54° N. South of latitude 54° S it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 750 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 49 million years.
The Sun seen from there
From a planet around HIP 40639, the Sun would look like a star of magnitude 14.48, in the direction where our sky has the constellation Cygnus. 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.