Star · M5III
40 Com
40 Com is a giant star of spectral type M5III in the constellation Coma Berenices, 597.0 light-years from the Sun.
| Other names | Gl 499.1 · HIP 63950 |
|---|---|
| Constellation | Coma Berenices |
| Distance | 597.0 light-years (183.0 pc) |
| Apparent magnitude | magnitude 5.53 |
| Absolute magnitude | magnitude −0.78 |
| Spectral type | M5III |
| Surface temperature | 3,850 K |
| Luminosity | 599 L☉ |
| Radius | 54.9 R☉ |
| Mass | 5.65 M☉ (estimated) |
| Right ascension (J2000) | 13h 06m 22.6s |
| Declination (J2000) | +22° 36′ 58″ |
| Space velocity (relative to the Sun) | 45.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.53). Visible from the whole Northern Hemisphere and south to latitude 67° S. North of latitude 67° N it never sets. It stands highest at midnight in April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1429. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 11 million years.
The Sun seen from there
From a planet around 40 Com, the Sun would look like a star of magnitude 11.14, in the direction where our sky has the constellation Cetus. 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.