Star · K7
CI Tau
CI Tau is a main-sequence star of spectral type K7 in the constellation Taurus, 515.3 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Taurus |
|---|---|
| Distance | 515.3 light-years (158.0 pc) |
| Apparent magnitude | magnitude 13.64 |
| Absolute magnitude | magnitude 7.65 |
| Spectral type | K7 |
| Surface temperature | 3,810 K |
| Luminosity | 0.556 L☉ |
| Radius | 1.88 R☉ |
| Mass | 0.9 M☉ |
| Age | 0.0 billion years |
| Right ascension (J2000) | 4h 33m 52.0s |
| Declination (J2000) | +22° 50′ 30″ |
| Space velocity (relative to the Sun) | 14.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.64. Visible from the whole Northern Hemisphere and south to latitude 67° S. North of latitude 67° N 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 1511. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.1 million years.
The Sun seen from there
From a planet around CI Tau, the Sun would look like a star of magnitude 10.82, in the direction where our sky has the constellation Ophiuchus. It would be invisible to the naked eye.
Planets
- CI Tau c 25.2-day orbit · 13 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.