Star · K0V
TOI-172
TOI-172 is a main-sequence star of spectral type K0V in the constellation Capricornus, 1,171 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Capricornus |
|---|---|
| Distance | 1,171 light-years (358.9 pc) |
| Apparent magnitude | magnitude 11.38 |
| Absolute magnitude | magnitude 3.61 |
| Spectral type | K0V |
| Surface temperature | 5,650 K |
| Luminosity | 2.89 L☉ |
| Radius | 1.78 R☉ |
| Mass | 1.13 M☉ |
| Age | 7.4 billion years |
| Metallicity [Fe/H] | 0.15 |
| Right ascension (J2000) | 21h 06m 31.6s |
| Declination (J2000) | −26° 41′ 34″ |
| Space velocity (relative to the Sun) | 92.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.38. Visible from the whole Southern Hemisphere and north to latitude 63° N. South of latitude 63° S it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 855. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 21 million years.
The Sun seen from there
From a planet around TOI-172, the Sun would look like a star of magnitude 12.60, in the direction where our sky has the constellation Cancer. It would be invisible to the naked eye.
Planets
- TOI-172 b 9.48-day orbit · 10.8 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.