Semiregular variable star

Rarity: Uncommon

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What Wikipedia says

In astronomy, a semiregular variable star, a type of variable star, is a giant or supergiant of intermediate and late (cooler) spectral type. It shows considerable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities.

Excerpt from the Wikipedia article “Semiregular variable star”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: AAVSO, CC BY-SA 2.5, via Wikimedia Commons.