V404 Cygni

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What Wikipedia says

V404 Cygni is a microquasar and a triple star system in the constellation of Cygnus. It contains a black hole with a mass of about 9 M☉ and an early K giant star companion with a mass slightly smaller than the Sun, and an evolved tertiary component.

Excerpt from the Wikipedia article “V404 Cygni”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Andrew Beardmore (Univ. of Leicester) and NASA/Swift, Public domain, via Wikimedia Commons.