Solyon
Solyon is the name of a Rogue Planet that was located in Sector 6309, which bordered Federation, Romulan and Cardassian space.
The name originates with the Asrai a species native to the planet Asrai Prime. The rogue planet is known as Solyon the Destroyer, and it is often considered to be the harbinger of a great catastrophe.
Despite the fact that the Asrai could not have predicted the presence of the world three thousand years in their past, when the myth originated, they were vaguely aware of it's existence.
The planet was discovered by the USS Rosenante in 2414, during a survey of the sector. They placed away teams on the surface of the planet in order to better get an idea of it's climate and limited biodiversity. It was quickly dsicovered that the planet, though only 1600 kilometers in diameter, had been terraformed, although it was still in the process and possibly had been for a few thousand years at the time of this discovery.
After determining that the planet would pass close enough to the planet Asrai Prime to upset it's delicate orbit around its parental Binary stars, the crew of the Rosenante undertook a mission to safeguard the pre-warp inhabitants of that world provided that they could prove that the Asrai did not fall under the restrictions imposed by the Prime Directive.
Solyon was first seen in the USS Rosenante Mission The Third Law