You can't measure the distance to a constellation because a constellation is a pattern of stars. Stars in a constellation can be vastly different distances from Earth.

To talk about distance, you need to focus on individual stars within Cepheus. Here are some examples:

* Alderamin (Alpha Cephei): This is the brightest star in Cepheus and is about 49 light-years from Earth.

* Mu Cephei (Herschel's Garnet Star): This red supergiant is a whopping 5,900 light-years away.

* The Cepheus OB1 Association: This is a group of young, hot stars within Cepheus, with distances ranging from about 1,000 to 2,000 light-years away.

So, when talking about Cepheus, you'll need to specify which star you're interested in to get a meaningful distance measurement.