Star · F8
TOI-257
TOI-257 is a main-sequence star of spectral type F8 in the constellation Horologium, 250.7 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | HIP 14710 |
|---|---|
| Constellation | Horologium |
| Distance | 250.7 light-years (76.9 pc) |
| Apparent magnitude | magnitude 7.57 |
| Absolute magnitude | magnitude 3.14 |
| Spectral type | F8 |
| Surface temperature | 6,100 K |
| Luminosity | 4.33 L☉ |
| Radius | 1.87 R☉ |
| Mass | 1.41 M☉ |
| Metallicity [Fe/H] | 0.18 |
| Right ascension (J2000) | 3h 10m 04.0s |
| Declination (J2000) | −50° 49′ 56″ |
| Space velocity (relative to the Sun) | 37.1 km/s |
In the sky
Too faint for the naked eye (magnitude 7.57); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 39° N. South of latitude 39° S it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1775. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.4 million years.
The Sun seen from there
From a planet around TOI-257, the Sun would look like a star of magnitude 9.26, in the direction where our sky has the constellation Boötes. It would be invisible to the naked eye.
Planets
- TOI-257 b 18.4-day orbit · 7.16 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 14836 9.10 light-years
- HIP 14045 9.68 light-years
- HIP 15060 10.9 light-years
- HIP 15756 12.2 light-years
- HIP 14609 13.8 light-years
- HIP 13979 14.2 light-years
- HIP 13341 15.9 light-years
- HIP 13485 18.3 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.