Star · A1V
21 Pup
21 Pup is a main-sequence star of spectral type A1V in the constellation Puppis, 675.1 light-years from the Sun.
| Other names | HIP 40604 |
|---|---|
| Constellation | Puppis |
| Distance | 675.1 light-years (207.0 pc) |
| Apparent magnitude | magnitude 6.32 |
| Absolute magnitude | magnitude −0.26 |
| Spectral type | A1V |
| Surface temperature | 9,470 K |
| Luminosity | 138 L☉ |
| Radius | 4.37 R☉ |
| Mass | 3.71 M☉ (estimated) |
| Right ascension (J2000) | 8h 17m 23.1s |
| Declination (J2000) | −16° 17′ 06″ |
| Space velocity (relative to the Sun) | 14.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.32). Visible from the whole Southern Hemisphere and north to latitude 74° N. South of latitude 74° 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 the year 1351. 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 21 Pup, the Sun would look like a star of magnitude 11.41, in the direction where our sky has the constellation Sagitta. 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.