Star · B9V
55 Cas
55 Cas is a main-sequence star of spectral type B9V in the constellation Cassiopeia, 1,068 light-years from the Sun.
| Other names | HIP 10438 |
|---|---|
| Constellation | Cassiopeia |
| Distance | 1,068 light-years (327.4 pc) |
| Apparent magnitude | magnitude 6.05 |
| Absolute magnitude | magnitude −1.53 |
| Spectral type | B9V |
| Surface temperature | 5,810 K |
| Luminosity | 376 L☉ |
| Radius | 19.1 R☉ |
| Mass | 4.94 M☉ (estimated) |
| Right ascension (J2000) | 2h 14m 29.1s |
| Declination (J2000) | +66° 31′ 28″ |
| Space velocity (relative to the Sun) | 15.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.05). Visible from the whole Northern Hemisphere and south to latitude 23° S. North of latitude 23° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 958. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 19 million years.
The Sun seen from there
From a planet around 55 Cas, the Sun would look like a star of magnitude 12.41, in the direction where our sky has the constellation Circinus. 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.