Star · G5 III
81 Cet
81 Cet is a giant star of spectral type G5 III in the constellation Cetus, 342.6 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 12247 |
|---|---|
| Constellation | Cetus |
| Distance | 342.6 light-years (105.0 pc) |
| Apparent magnitude | magnitude 5.65 |
| Absolute magnitude | magnitude 0.54 |
| Spectral type | G5 III |
| Surface temperature | 4,730 K |
| Luminosity | 57.6 L☉ |
| Radius | 11.2 R☉ |
| Mass | 1.23 M☉ |
| Metallicity [Fe/H] | -0.11 |
| Right ascension (J2000) | 2h 37m 41.8s |
| Declination (J2000) | −3° 23′ 46″ |
| Space velocity (relative to the Sun) | 31.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.65). Visible from the whole Southern Hemisphere and north to latitude 87° N. 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 the year 1683. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.1 million years.
The Sun seen from there
From a planet around 81 Cet, the Sun would look like a star of magnitude 9.94, in the direction where our sky has the constellation Virgo. It would be invisible to the naked eye.
Planets
- 81 Cet b 1,010-day orbit · 13.1 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.