Star · K1 III-IV
Errai
Errai is a subgiant star of spectral type K1 III-IV in the constellation Cepheus, 45.0 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | γ Cep · gam Cep · Gl 903 · HIP 116727 |
|---|---|
| Constellation | Cepheus |
| Distance | 45.0 light-years (13.8 pc) |
| Apparent magnitude | magnitude 3.21 |
| Absolute magnitude | magnitude 2.51 |
| Spectral type | K1 III-IV |
| Surface temperature | 4,780 K |
| Luminosity | 11.8 L☉ |
| Radius | 4.74 R☉ |
| Mass | 1.26 M☉ |
| Age | 5.7 billion years |
| Metallicity [Fe/H] | 0.20 |
| Right ascension (J2000) | 23h 39m 20.8s |
| Declination (J2000) | +77° 37′ 56″ |
| Space velocity (relative to the Sun) | 45.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.21). Visible from the whole Northern Hemisphere and south to latitude 12° S. North of latitude 12° N it never sets.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1981. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 798 thousand years.
The Sun seen from there
From a planet around Errai, the Sun would look like a star of magnitude 5.53, in the direction where our sky has the constellation Chamaeleon. It would be visible to the naked eye.
Planets
- gam Cep b 904-day orbit · 12.5 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 1035 6.39 light-years
- WISE J223720.39+722833.8 6.41 light-years
- Gl 133 8.36 light-years
- GJ 3015B 8.98 light-years
- GJ 4312 9.29 light-years
- GJ 3125 9.40 light-years
- WISEP J004701.06+680352.1 9.51 light-years
- Gl 909A 9.56 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.