Star · K4 III
Tarf
Tarf is a giant star of spectral type K4 III in the constellation Cancer, 322.8 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Other names | β Cnc · bet Cnc · HIP 40526 |
|---|---|
| Constellation | Cancer |
| Distance | 322.8 light-years (99.0 pc) |
| Apparent magnitude | magnitude 3.53 |
| Absolute magnitude | magnitude −1.45 |
| Spectral type | K4 III |
| Surface temperature | 4,090 K |
| Luminosity | 794 L☉ |
| Radius | 47.2 R☉ |
| Mass | 1.7 M☉ |
| Age | 1.9 billion years |
| Metallicity [Fe/H] | -0.29 |
| Right ascension (J2000) | 8h 16m 30.9s |
| Declination (J2000) | +9° 11′ 08″ |
| Space velocity (relative to the Sun) | 38.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.53). Visible from the whole Northern Hemisphere and south to latitude 81° S. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1703. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.7 million years.
The Sun seen from there
From a planet around Tarf, the Sun would look like a star of magnitude 9.81, in the direction where our sky has the constellation Capricornus. It would be invisible to the naked eye.
Planets
- bet Cnc b 605-day orbit · 12.6 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 41064 10.5 light-years
- HIP 39904 19.5 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.