Star · A2I
γ¹ Del
γ¹ Del is a supergiant star of spectral type A2I in the constellation Delphinus, 117.0 light-years from the Sun.
| Other names | HIP 102531 |
|---|---|
| Constellation | Delphinus |
| Distance | 117.0 light-years (35.9 pc) |
| Apparent magnitude | magnitude 5.15 |
| Absolute magnitude | magnitude 2.38 |
| Spectral type | A2I |
| Surface temperature | 6,410 K |
| Luminosity | 9.63 L☉ |
| Radius | 2.52 R☉ |
| Mass | 1.76 M☉ (estimated) |
| Right ascension (J2000) | 20h 46m 38.9s |
| Declination (J2000) | +16° 07′ 27″ |
| Space velocity (relative to the Sun) | 35.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.15). Visible from the whole Northern Hemisphere and south to latitude 74° S. North of latitude 74° 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 1909. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.1 million years.
The Sun seen from there
From a planet around γ¹ Del, the Sun would look like a star of magnitude 7.60, 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):
- γ² Del 1.03 light-years
- HIP 102490 2.62 light-years
- HIP 102782 9.86 light-years
- PSO J306.0126+16.7969 11.4 light-years
- HD 196885 A 11.9 light-years
- HD 195019 12.0 light-years
- 2MASSW J2101154+175658 12.1 light-years
- HIP 104659 14.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.