Small Yellow Rocket

The Small Yellow Rocket is a type of firework associated with, but not exclusive to, the Lunar Festival event.

A Firework Launcher is required to use a Small Yellow Rocket. (see Notes section)

Source
Small Yellow Rockets are contained in the which can be purchased for  from  in Moonglade during the Lunar Festival.

(Unlike several of the Lunar Festival fireworks, this item cannot be crafted by Engineers.)

Object of
Lunar Fireworks requires that you launch eight Lunar Fireworks (color and size not specified) and two Cluster Fireworks (color and size not specified). Small Yellow Rockets are a Lunar Firework, but they are not vended near the area of the quest, so are not a convenient item to use to complete the quest.