Star · A4III
Acamar
Acamar is a giant star of spectral type A4III in the constellation Eridanus, 163.9 light-years from the Sun.
| Other names | θ¹ Eri · HIP 13847 |
|---|---|
| Constellation | Eridanus |
| Distance | 163.9 light-years (50.2 pc) |
| Apparent magnitude | magnitude 2.88 |
| Absolute magnitude | magnitude −0.63 |
| Spectral type | A4III |
| Surface temperature | 8,770 K |
| Luminosity | 175 L☉ |
| Radius | 5.74 R☉ |
| Mass | 3.97 M☉ (estimated) |
| Right ascension (J2000) | 2h 58m 15.7s |
| Declination (J2000) | −40° 18′ 17″ |
| Space velocity (relative to the Sun) | 18.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 2.88). Visible from the whole Southern Hemisphere and north to latitude 50° N. South of latitude 50° S it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1862. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.9 million years.
The Sun seen from there
From a planet around Acamar, the Sun would look like a star of magnitude 8.34, in the direction where our sky has the constellation Boötes. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 14007 9.03 light-years
- HIP 12889 9.95 light-years
- HIP 14596 11.9 light-years
- HIP 12716 12.7 light-years
- HIP 11989 14.2 light-years
- HIP 11596 18.2 light-years
- HIP 14265 18.6 light-years
- ι Eri 19.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.