Star · G8II
40 Cas
40 Cas is a bright giant star of spectral type G8II in the constellation Cassiopeia, 460.9 light-years from the Sun.
| Other names | HIP 7650 |
|---|---|
| Constellation | Cassiopeia |
| Distance | 460.9 light-years (141.3 pc) |
| Apparent magnitude | magnitude 5.28 |
| Absolute magnitude | magnitude −0.47 |
| Spectral type | G8II |
| Surface temperature | 4,810 K |
| Luminosity | 199 L☉ |
| Radius | 20.3 R☉ |
| Mass | 4.12 M☉ (estimated) |
| Right ascension (J2000) | 1h 38m 30.9s |
| Declination (J2000) | +73° 02′ 24″ |
| Space velocity (relative to the Sun) | 13.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.28). Visible from the whole Northern Hemisphere and south to latitude 17° S. North of latitude 17° 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 1565. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 8.2 million years.
The Sun seen from there
From a planet around 40 Cas, the Sun would look like a star of magnitude 10.58, in the direction where our sky has the constellation Musca. 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.