Stellar Data for

Type of Star:

Spectral Class:

Distance:

Luminosity:

Mass:

Surface Temperature:

Red Dwarf

M2V

8,3 Lightyears

0,024 L

Low

3000 K

 

The Planets of Lalande 21185

Lalande 21185 b

Mass:

Orbital Radius:

Orbital Period:

Temperature:

Eccentricity:

0,9 Jupiter Masses

2 AU

5,8 Years

-150C

Unknown

Lalande 21185 c

Mass:

Orbital Radius:

Orbital Period:

Temperature:

Eccentricity:

1,6 Jupiter Masses

10 AU

30 Years

-220C

Unknown

The system may contain a third planet on a wider orbit.

Comparison to Solar System

Sun

Lalande 21185



 

Speculations about Lalande 21185 b and c

Both Lalande 21185 b and c could have been ideal Jovian worlds - were it not for their parent star. Lalande 21185 is a Red Dwarf, a cosmic glowworm rather than a bright fire as our own sun. The two worlds of Lalande 21185 are cold and dark. Both planets have been discovered by directly observing the star's motion across the sky.

Lalande 21185 b may resemble Jupiter in composition, only somewhat colder. Any moons are frozen, barren worlds, covered with ice and frozen ammoniak. Tidal friction on the inner moons may drive geysirs of liquid methane. Nowhere on the worlds of Lalande 21185 could water exist in its precious liquid form.


Lalande 21185 b in the dim light of its sun

Farther outside, on an orbit similar to Saturn's, is Lalande 21185 c. But Lalande 21185 c would not be as bright as our own ringed beauty - with a sun 40 times dimmer than ours, this world would more resemble Uranus or Neptune, and nothing more spectacular than a winter snowstorm of frozen methane may be seen on its moons. Cast in a dim, red light and incredibly cold, the worlds of Lalande 21185 are unsuitable for any kind of life.

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