Star · K0 III
BD+48 738
BD+48 738 is a supergiant star of spectral type K0 III in the constellation Perseus, 2,658 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Perseus |
|---|---|
| Distance | 2,658 light-years (814.8 pc) |
| Apparent magnitude | magnitude 9.28 |
| Absolute magnitude | magnitude −0.28 |
| Spectral type | K0 III |
| Surface temperature | 4,410 K |
| Luminosity | 49 L☉ |
| Radius | 11 R☉ |
| Mass | 0.74 M☉ |
| Metallicity [Fe/H] | -0.20 |
| Right ascension (J2000) | 2h 42m 50.5s |
| Declination (J2000) | +49° 35′ 13″ |
| Space velocity (relative to the Sun) | 27.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.28. Visible from the whole Northern Hemisphere and south to latitude 40° S. North of latitude 40° 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 633 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 47 million years.
The Sun seen from there
From a planet around BD+48 738, the Sun would look like a star of magnitude 14.39, in the direction where our sky has the constellation Lupus. It would be invisible to the naked eye.
Planets
- BD+48 738 b 393-day orbit · 13.9 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.