Tags: Star.
FU Orionis is a variable star in the constellation of Orion that in 1937 rose in apparent visual magnitude from 16.5 to 9.6 and has since been around magnitude 9. For a long time it was considered unique but in 1970 a similar star V1057 Cygni was discovered and a number of additional examples have been discovered since then. These stars constitute the FU Orionis class of variable stars GCVS type FU often nicknamed FUors.
