Star · ?
HIP 51821
HIP 51821 is a supergiant star of spectral type ? in the constellation Antlia, 902.1 light-years from the Sun.
| Constellation | Antlia |
|---|---|
| Distance | 902.1 light-years (276.6 pc) |
| Apparent magnitude | magnitude 5.50 |
| Absolute magnitude | magnitude −1.71 |
| Spectral type | ? |
| Surface temperature | 2,980 K |
| Luminosity | 7,580 L☉ |
| Radius | 328 R☉ |
| Mass | 11.7 M☉ (estimated) |
| Right ascension (J2000) | 10h 35m 12.8s |
| Declination (J2000) | −39° 33′ 45″ |
| Space velocity (relative to the Sun) | 55.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.50). Visible from the whole Southern Hemisphere and north to latitude 50° N. South of latitude 50° S it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1124. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 16 million years.
The Sun seen from there
From a planet around HIP 51821, the Sun would look like a star of magnitude 12.04, in the direction where our sky has the constellation Lacerta. 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.