Star · M3
TOI-521
TOI-521 is a main-sequence star of spectral type M3 in the constellation Cancer, 199.0 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Cancer |
|---|---|
| Distance | 199.0 light-years (61.0 pc) |
| Apparent magnitude | magnitude 14.64 |
| Absolute magnitude | magnitude 10.71 |
| Spectral type | M3 |
| Surface temperature | 3,540 K |
| Luminosity | 0.0252 L☉ |
| Radius | 0.421 R☉ |
| Mass | 0.42 M☉ |
| Age | 0.8 billion years |
| Metallicity [Fe/H] | -0.12 |
| Right ascension (J2000) | 8h 13m 22.6s |
| Declination (J2000) | +12° 13′ 20″ |
| Space velocity (relative to the Sun) | 35.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.64. Visible from the whole Northern Hemisphere and south to latitude 78° S. North of latitude 78° N it never sets. 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 1827. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.5 million years.
The Sun seen from there
From a planet around TOI-521, the Sun would look like a star of magnitude 8.76, in the direction where our sky has the constellation Capricornus. It would be invisible to the naked eye.
Planets
- TOI-521 b 1.54-day orbit · 1.98 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- SDSS J080322.77+123845.3 8.60 light-years
- 8 Cnc 10.7 light-years
- HIP 40134 13.9 light-years
- HIP 39650 14.0 light-years
- HIP 39271 18.3 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.