Star · A1V
Yildun
Yildun is a main-sequence star of spectral type A1V in the constellation Ursa Minor, 182.4 light-years from the Sun.
| Other names | δ UMi · HIP 85822 |
|---|---|
| Constellation | Ursa Minor |
| Distance | 182.4 light-years (55.9 pc) |
| Apparent magnitude | magnitude 4.35 |
| Absolute magnitude | magnitude 0.61 |
| Spectral type | A1V |
| Surface temperature | 9,870 K |
| Luminosity | 65.7 L☉ |
| Radius | 2.77 R☉ |
| Mass | 3 M☉ (estimated) |
| Right ascension (J2000) | 17h 32m 13.0s |
| Declination (J2000) | +86° 35′ 11″ |
| Space velocity (relative to the Sun) | 17.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.35). Visible from the whole Northern Hemisphere and south to latitude 3° S. North of latitude 3° N it never sets.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1844. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.2 million years.
The Sun seen from there
From a planet around Yildun, the Sun would look like a star of magnitude 8.57, in the direction where our sky has the constellation Octans. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 74034 15.2 light-years
- HIP 705 16.3 light-years
- HIP 100321 18.3 light-years
- Gl 506.2 19.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.