Lalande 21185 is the fourth-nearest stellar system and the brightest red dwarf visible from the northern hemisphere. Two planets have been confirmed around it: a warm super-Earth on a 13-day orbit, and a cold Neptune-mass world nearly 3 AU out.
Fly there in 3DThe star is hurtling across the sky at nearly 4.8 arcseconds a year and closing on us at 85 km/s. In about 19,900 years it will pass within 4.65 light-years - closer than Alpha Centauri is today.
| Spectral type | M2 V |
| Surface temperature | 3,719 K |
| Mass | 0.3899 solar masses |
| Radius | 0.3685 solar radii |
| Luminosity | 0.0195 times the Sun |
| Apparent magnitude | 7.49 |
| Age | about 8 billion years |
| Distance from the Sun | 8.3 light-years (2.5 parsecs) |
| Position (J2000) | RA 165.8341°, Dec 35.9699° |
| Constellation | Ursa Major |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Lalande 21185 b | 12.9 days | 0.0788 AU | 1.45 R⊕ estimated | 2.69 M⊕ minimum | Radial Velocity, 2019 |
| Lalande 21185 c | 8.1 years | 2.940 AU | 3.76 R⊕ estimated | 13.6 M⊕ minimum | Radial Velocity, 2021 |
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.