HD 21520 is 258 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this 5,871 K star; the first was found in 2024 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DHD 21520 b goes round its star every 25.1 days, 4 times as often as Mercury goes round the Sun.
| Surface temperature | 5,871 K |
| Mass | 1.09 solar masses |
| Radius | 1.044 solar radii |
| Luminosity | 1.164 times the Sun |
| Apparent magnitude | 9.17 |
| Age | about 5.3 billion years |
| Distance from the Sun | 258.3 light-years (79.2 parsecs) |
| Position (J2000) | RA 51.6403°, Dec -43.6137° |
| Constellation | Eridanus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HD 21520 b | 25.1 days | 0.173 AU | 2.697 R⊕ | 17.7 M⊕ | Transit, 2024 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.