The following is a list of unnamed planetoids.
Alpha and Beta Quadrants
Azati Prime system planetoid
This planetoid was located on the outskirts of the Azati Prime star system. It had a rotation of about eight hours.
The Enterprise attempted to hide behind the planetoid to avoid detection by Xindi forces in the system in February of 2154, but was unaware of the fact that there was a listening post on the planetoid below, staffed by three Xindi. Enterprise destroyed the outpost before it could send a message to Azati Prime, but the lack of a report from the outpost alerted Commander Dolim of Enterprise's presence anyway. (ENT: "Azati Prime")
Companion's homeworld
- see Companion's homeworld
Diplomacy scenario 12-alpha planetoid
The Diplomacy scenario 12-alpha revolved around the mining rights for a planetoid in Nausicaan space.
Planetoid used for torpedo dissection
In an alternate reality 2259, this planetoid with a breathable atmosphere was used by Carol Marcus and Leonard McCoy to open up an advanced long-range torpedo without endangering the USS Enterprise. (Star Trek Into Darkness)
Delta Quadrant
Dark matter nebula planetoid
In 2371 the USS Voyager encountered several planetoids inside a dark matter nebula that the Komar called their home. (VOY: "Cathexis")
Vidiian planetoid
In 2371, Neelix's lungs were stolen by Vidiians Dereth and Motura in underground caverns of this M class planetoid. (VOY: "Phage")
Other
Riddle planetoid
This class L planetoid was the subject of a riddle: "A lone Ensign finds himself stranded on a class L planetoid with no rations. His only possession, a calendar. When Starfleet finds him twelve months later, he's in perfect health. Why didn't he starve to death?". Tuvok suggested that such a planetoid might contain hot water springs. (VOY: "Riddles")