https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/counties/iowa/dubuque-county.md
Found to be double in 1650, Mizar is a prime target for someone with a new telescope, as the components are an easy 14 seconds of arc apart (at least 500 astronomical units), the two taking at least 5000 years to make their orbit about each other.