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FU Orionis North, the main star of the star system FU Orionis, is a star of uncertain classification in the constellation of Orion. Its star system is the prototype of the FU Orionis type variables. The star is associated with a molecular cloud catalogued as Barnard 35. The name FU Orionis is a variable star designation.

Before 1970, the star was considered a unique variable before the discovery of V1057 Cygni. The stars were given a variable star class, in which are nicknamed FUors. FU Ori variables are pre-main sequence stars that display extreme changes in magnitude and spectral type.

Both FU Orionis North and South have protoplanetary disks, which have both been resolved by ALMA. For this specific star, it's dust disk is about 22 astronomical units in diameter.

Nebula[]

FU Orionis

FU Orionis is the brightest star in this image.

FU Orionis is located in Barnard 35, which is located in the Lambda Orionis Ring. It also seems to have an arc-shaped nebula near it.

Potential Planet[]

FU Orionis North is thought to have an exoplanet named FU Orionis North b or simply FU Orionis Ab. The planet is possibly the largest known and used to be twice as massive and 14 Rj in radius.

Exoplanetary System of FU Orionis North/A
Name Size Mass Semi-Major Axis
FU Orionis North b (unconfirmed) ~9.8 jupiter radii

~1.00707 solar radii

~3 jupiter masses 0.08 AU
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