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- Leo is also home to one bright variable star, the red giant R Leonis.
- R Leonis, 330 light-years from Earth, has a period of 310 days and a diameter of 450 solar diameters.
- The apparent magnitude of R Leonis varies between 4.31 and 11.65 with a period of 312 days . At maximum it can be seen with the naked eye, while at minimum a telescope of at least 7 cm is needed.
- It's difficult to see r leonis in a sentence .
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