Grazer
Grazer was a planet.

In the 23rd century, Ash Tyler's mother intended to visit the moons of Grazer for her first vacation in twelve years. However, on the way she was killed by a rogue comet. ()

Appendices

Background information 
Before its on-screen mention, StarTrek.com already listed Grazer as the conjectural name of the Grazerite homeworld and "apparently Class M and a UFP member". 

Grazer was also depicted in Star Trek: Star Charts ("United Federation of Planets I", "United Federation of Planets III") and the Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385") According to those works, the planet was located in the Grazer system, an Alpha Quadrant quaternary system with stars of classes F, M, K, and G.

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Planets