Star · A0III
HIP 109745
HIP 109745 is a giant star of spectral type A0III in the constellation Lacerta, 252.8 light-years from the Sun.
| Constellation | Lacerta |
|---|---|
| Distance | 252.8 light-years (77.5 pc) |
| Apparent magnitude | magnitude 5.53 |
| Absolute magnitude | magnitude 1.08 |
| Spectral type | A0III |
| Surface temperature | 9,870 K |
| Luminosity | 42.6 L☉ |
| Radius | 2.23 R☉ |
| Mass | 2.65 M☉ (estimated) |
| Right ascension (J2000) | 22h 13m 49.2s |
| Declination (J2000) | +45° 26′ 26″ |
| Space velocity (relative to the Sun) | 29.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.53). Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1773. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.5 million years.
The Sun seen from there
From a planet around HIP 109745, the Sun would look like a star of magnitude 9.28, in the direction where our sky has the constellation Vela. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 110291 7.17 light-years
- HIP 108147 16.5 light-years
- HIP 110071 18.6 light-years
- HIP 109831 19.0 light-years
- HIP 108400 19.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.