Star · K3 III
BD+48 740
BD+48 740 is a supergiant star of spectral type K3 III in the constellation Perseus, 2,048 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 12684 |
|---|---|
| Constellation | Perseus |
| Distance | 2,048 light-years (628.0 pc) |
| Apparent magnitude | magnitude 8.69 |
| Absolute magnitude | magnitude −0.30 |
| Spectral type | K3 III |
| Surface temperature | 4,530 K |
| Luminosity | 43.7 L☉ |
| Radius | 10.3 R☉ |
| Mass | 1.09 M☉ |
| Metallicity [Fe/H] | -0.13 |
| Right ascension (J2000) | 2h 42m 58.2s |
| Declination (J2000) | +48° 55′ 48″ |
| Space velocity (relative to the Sun) | 48.7 km/s |
In the sky
Too faint for the naked eye (magnitude 8.69); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 41° S. North of latitude 41° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 23 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 36 million years.
The Sun seen from there
From a planet around BD+48 740, the Sun would look like a star of magnitude 13.82, in the direction where our sky has the constellation Lupus. It would be invisible to the naked eye.
Planets
- BD+48 740 b 733-day orbit · 13.5 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.