18 Delphini b

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What Wikipedia says

18 Delphini b (abbreviated 18 Del b), formally named Arion , is an extrasolar planet approximately 245 light-years away in the constellation of Delphinus.

Excerpt from the Wikipedia article “18 Delphini b”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tyrogthekreeper at en.wikipedia, CC BY-SA 3.0, via Wikimedia Commons.