It's impossible to definitively say there are only 5 "main" constellations. There are 88 officially recognized constellations by the International Astronomical Union, each with its own significance and history.

However, some constellations are more well-known and easily recognizable than others. Here are 5 popular ones:

1. Ursa Major (The Great Bear): One of the most recognizable constellations in the Northern Hemisphere, it contains the asterism known as the "Big Dipper."

2. Ursa Minor (The Little Bear): Located near Ursa Major, this constellation contains Polaris, the North Star.

3. Orion (The Hunter): A prominent constellation in the winter sky, featuring the easily recognizable "belt" of three stars.

4. Taurus (The Bull): This constellation features the bright red star Aldebaran and the Pleiades star cluster.

5. Cassiopeia (The Queen): This constellation resembles a "W" or "M" shape in the Northern Hemisphere.

Keep in mind that these are just a few examples, and there are many other constellations worth exploring!