R Serpentis
R Serpentis is a Mira variable type star in the equatorial constellation of Serpens. It ranges between apparent magnitude 5.16 and 14.4, and spectral types M5e to M8e, over a period of 356.41 days. When it is near maximum brightness, it can be seen with the naked eye under excellent observing conditions. The variability of this star was discovered in 1826 by Karl Ludwig Harding.