Lalande 21185

Updated

Details

Lalande 21185 is a nearby red dwarf in Ursa Major, also cataloged as Gliese 411 and HD 95735. It is the brightest red dwarf visible from the northern hemisphere, yet it is still too dim for unaided eyes and is better known through telescopes, surveys, and its nearby planetary system.

Lalande 21185 matters because it makes the nearby red-dwarf population feel less abstract. It is only about eight light-years away, close enough to be one of the familiar names in maps of the solar neighborhood, but it is still invisible to the naked eye. That contrast is the point: some of the nearest stars are not bright landmarks in the sky, but quiet low-mass stars that only become obvious once astronomy measures carefully.

The star also has a useful historical edge. Its large proper motion helped mark it as a nearby object in the nineteenth century, and improved parallax work made it one of the early nearby-star benchmarks. Today it is usually treated under several names, including Gliese 411 and HD 95735, which is a reminder that nearby stars often arrive through catalogs before they become vivid objects in public imagination.

That is why Lalande 21185 works on this scale. It is larger than the smallest red dwarfs in the journey but still far below the Sun, a compact star that is physically modest and observationally important. Lalande 21185 helps show that the local stellar neighborhood is built not only from famous bright stars, but from dim durable stars that dominate by number and endurance.

237,277km
Visual creditscaleofspace.org / CC BY-NC 4.0

Key facts

Category
Stars
Object class
M-type red dwarf star
Composition
Hydrogen and helium
Scale fact
543,000 kmdiameter
Mass
~0.39 solar masses
Temperature
~3,550 K surface

Scale context

Where Lalande 21185 sits on the full axis

By size on the journey, Lalande 21185 sits between Proxima Centauri and 61 Cygni A. The band below compares Lalande 21185 with nearby M-type red dwarf star objects so the size jump stays easy to read.

Shared physical scale
415,235km
Proxima Centauri215,000 km
Lalande 21185543,000 km

Together, these objects make the size change around Lalande 21185 easy to compare at a glance.

Sources

References for Lalande 21185

Measurements and descriptive context are compiled by the Scale of Space team from the references below. If you find an error, please let us know.

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