Star · F1III
40 Boo
40 Boo is a giant star of spectral type F1III in the constellation Boötes, 165.8 light-years from the Sun.
| Other names | HIP 73369 |
|---|---|
| Constellation | Boötes |
| Distance | 165.8 light-years (50.8 pc) |
| Apparent magnitude | magnitude 5.64 |
| Absolute magnitude | magnitude 2.11 |
| Spectral type | F1III |
| Surface temperature | 7,240 K |
| Luminosity | 12.3 L☉ |
| Radius | 2.23 R☉ |
| Mass | 1.87 M☉ (estimated) |
| Right ascension (J2000) | 14h 59m 36.9s |
| Declination (J2000) | +39° 15′ 55″ |
| Space velocity (relative to the Sun) | 17.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.64). Visible from the whole Northern Hemisphere and south to latitude 51° S. North of latitude 51° N it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1860. 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 40 Boo, the Sun would look like a star of magnitude 8.36, in the direction where our sky has the constellation Fornax. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 73765 3.83 light-years
- HIP 73725 4.21 light-years
- GJ 3875 11.3 light-years
- HIP 72145 13.6 light-years
- SDSS J144842.76+371932.1 14.1 light-years
- HIP 74381 14.5 light-years
- HIP 72261 16.0 light-years
- HIP 72463 17.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.