LL Pegasi (AFGL 3068) is a Mira variable star surrounded by a pinwheel-shaped nebula, IRAS 23166+1655, thought to be a preplanetary nebula.

It is a binary system that includes an extreme carbon star.

The pair is hidden by the dust cloud ejected from the carbon star and is only visible in infrared light.

[10] The nebula displays an unusual Archimedean spiral shape.

The distance between the spiral arms and their rate of expansion is consistent with estimates of the pair's 810 year orbital period based on their apparent angular separation.