The term "Goldilocks planet" is a popular way to describe a planet that is in the habitable zone of its star. This means the planet is at the right distance from its star to potentially have liquid water on its surface, which is considered crucial for life as we know it.

However, there is no official "Goldilocks planet" that astronomers have identified. Instead, there are many planets that scientists have categorized as being within the habitable zone of their respective stars.

So, to answer your question more directly:

* A Goldilocks planet is a concept, not a specific planet.

* There are many planets in various solar systems that fit the definition of a Goldilocks planet.

Some of the most well-known exoplanets potentially within habitable zones include:

* Proxima Centauri b: The closest known exoplanet to Earth, orbiting the red dwarf star Proxima Centauri.

* Kepler-186f: The first confirmed Earth-sized planet within the habitable zone of another star.

* TRAPPIST-1e: One of seven Earth-sized planets orbiting the ultra-cool dwarf star TRAPPIST-1, within its habitable zone.

It's important to note that while these planets are within habitable zones, that doesn't automatically mean they are habitable. Many other factors contribute to habitability, such as atmospheric composition, geological activity, and the presence of a magnetic field.