Star · A3IV
η Del
η Del is a subgiant star of spectral type A3IV in the constellation Delphinus, 179.8 light-years from the Sun.
| Other names | HIP 101483 |
|---|---|
| Constellation | Delphinus |
| Distance | 179.8 light-years (55.1 pc) |
| Apparent magnitude | magnitude 5.39 |
| Absolute magnitude | magnitude 1.68 |
| Spectral type | A3IV |
| Surface temperature | 9,100 K |
| Luminosity | 21.8 L☉ |
| Radius | 1.88 R☉ |
| Mass | 2.19 M☉ (estimated) |
| Right ascension (J2000) | 20h 33m 57.0s |
| Declination (J2000) | +13° 01′ 38″ |
| Space velocity (relative to the Sun) | 30.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.39). Visible from the whole Northern Hemisphere and south to latitude 77° S. North of latitude 77° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1846. 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 η Del, the Sun would look like a star of magnitude 8.54, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 101910 10.9 light-years
- HIP 100792 12.9 light-years
- HIP 102611 14.5 light-years
- HIP 101233 17.1 light-years
- ι Del 17.3 light-years
- HIP 102807 18.3 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.