Star · A1V
Alkaphrah
Alkaphrah is a main-sequence star of spectral type A1V in the constellation Ursa Major, 358.4 light-years from the Sun.
| Other names | κ UMa · HIP 44471 |
|---|---|
| Constellation | Ursa Major |
| Distance | 358.4 light-years (109.9 pc) |
| Apparent magnitude | magnitude 3.57 |
| Absolute magnitude | magnitude −1.63 |
| Spectral type | A1V |
| Surface temperature | 10,040 K |
| Luminosity | 534 L☉ |
| Radius | 7.64 R☉ |
| Mass | 5.47 M☉ (estimated) |
| Right ascension (J2000) | 9h 03m 37.5s |
| Declination (J2000) | +47° 09′ 23″ |
| Space velocity (relative to the Sun) | 34.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.57). Visible from the whole Northern Hemisphere and south to latitude 43° S. North of latitude 43° N 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 1668. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.4 million years.
The Sun seen from there
From a planet around Alkaphrah, the Sun would look like a star of magnitude 10.03, in the direction where our sky has the constellation Indus. 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.