Star · F2III
Arkab Posterior
Arkab Posterior is a giant star of spectral type F2III in the constellation Sagittarius, 139.6 light-years from the Sun.
| Other names | β² Sgr · HIP 95294 |
|---|---|
| Constellation | Sagittarius |
| Distance | 139.6 light-years (42.8 pc) |
| Apparent magnitude | magnitude 4.27 |
| Absolute magnitude | magnitude 1.11 |
| Spectral type | F2III |
| Surface temperature | 7,160 K |
| Luminosity | 30.6 L☉ |
| Radius | 3.6 R☉ |
| Mass | 2.41 M☉ (estimated) |
| Right ascension (J2000) | 19h 23m 13.2s |
| Declination (J2000) | −44° 47′ 59″ |
| Space velocity (relative to the Sun) | 25.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.27). Visible from the whole Southern Hemisphere and north to latitude 45° N. South of latitude 45° S 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 1886. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.5 million years.
The Sun seen from there
From a planet around Arkab Posterior, the Sun would look like a star of magnitude 7.99, in the direction where our sky has the constellation Lynx. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 96095 7.08 light-years
- HIP 96426 9.54 light-years
- HIP 93102 12.9 light-years
- HIP 95795 13.2 light-years
- HIP 96725 13.6 light-years
- HIP 94668 15.9 light-years
- HIP 94863 15.9 light-years
- HIP 92181 17.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.