Lalande 21185

Encyclopedia : L : LA : LAL : Lalande 21185

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|- ! style="background-color: #FFFFC0;" colspan="2" | Details |- |style="vertical-align: baseline;" | Mass | M_☉ |- |style="vertical-align: baseline;" | Radius | R_☉ |- |style="vertical-align: baseline;" | Luminosity | L_☉ |- |style="vertical-align: baseline;" | Temperature | K |- |style="vertical-align: baseline;" | Metallicity | |- |style="vertical-align: baseline;" | Rotation | |- |style="vertical-align: baseline;" | Age | })<()or(}})=()and(}})<())}}} years

|- ! style="background-color: #FFFFC0;" colspan="2" | Other designations |- | colspan="2" |

|} Lalande 21185 is a red dwarf star approximately 2.5 pc or 8.21 light years from Earth's Solar System, and is the fourth closest known star to the Sun. It has a relatively high velocity and is moving in an orbit perpendicular to the plane of the galaxy. Its closest neighbour is Wolf 359, 1.24 pc or 4.03 ly away. It is also a variable flare star that sometimes increases in brightness. Based on the analysis of astrometric perturbations, this star is thought to possess at least two planets in orbit. The first planetary candidate Laland 21185B is 2.2 AUs from its the star and may have about nine tenths of Jupiter's mass. Lalande 21185C, the second planetary candidate, has a mass about 1.6 times that of Jupiter and is thought to lie 11AUs from Laland 21185B.

This star was discovered by Joseph-Jérôme Lefrançais de Lalande at the Paris Observatory some time before 1801.

Lalande 21185 in fiction

• Featured in .
• Was renamed Ra in Gregory Benford's novel Across the Sea of Suns.
• In Star Corps by Ian Douglas, one of Lalande 21185's gas giants has an Earth-like moon where an alien race holds humans in slavery, resulting in a force of US Marines being sent in 2148 to free them.
• Title of Janusz A. Zajdel novel.

See also

• List of nearest stars

External links

• [SolStation.com: Lalande 21185]

 

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