R Reticuli, also listed under the duplicate variable star designation S Reticuli,[4] is a Mira variable star in the southern constellation Reticulum.

It is an aging red giant star on the asymptotic giant branch[5] with a stellar classification that varies between M4e to M7.5e,[6] being hottest near maximum visual magnitude.

[10] The brightness of the star varies between apparent visual magnitudes 6.35 and 14.2[4] with an average period of 281.08±0.58 d.[11] The mean maximum magnitude is 7.57 and the mean minimum magnitude 13.80.

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