1. Trans-Neptunian Objects (TNOs): This is the most likely scenario. TNOs are icy bodies that orbit the Sun beyond Neptune. While most are smaller, some larger ones like Eris and Makemake exist at distances of 68 AU or further.
2. Scattered Disk Objects: These are TNOs that have been "scattered" out of the Kuiper Belt by the gravitational influence of Neptune. They have highly eccentric orbits and can reach distances of hundreds of AU.
3. Sedna-like Objects: These are extremely distant objects with highly elongated orbits that take them far beyond the Kuiper Belt. Sedna, the namesake of this category, orbits with an aphelion (farthest point from the Sun) of around 937 AU.
4. Oort Cloud Objects: The Oort Cloud is a theoretical sphere of icy bodies surrounding the Solar System. It's thought to be the source of long-period comets. While objects in the Oort Cloud are incredibly distant, they can occasionally be perturbed and sent towards the inner Solar System.
5. Interstellar Objects: There's a chance that a passing interstellar object, like 'Oumuamua, could be at that distance. These objects are not gravitationally bound to our Sun and come from other star systems.
Determining the object's identity: Without more information about its size, brightness, and orbital characteristics, it's difficult to pinpoint exactly what kind of object it might be at 68 AU. Astronomers use a variety of tools and techniques to identify and study these distant objects.
Important Note: The exact location and type of object at 68 AU can change over time, as these objects are constantly moving within the Solar System.
