The nebula displays an unusual spiral shape. The shape is thought to be formed through the interaction between the stellar companion and the carbon star, as has been seen in other binary systems, although not with such a precise geometric form. The distance between spiral layers is consistent with estimates of the pair's orbital period based on their apparent angular separation. Its position is RA 23 19 12, Dec +17 11 35. Some[who?] say that, due to the regular appearance of spiral arms, the orbital period between LL Pegasi A (IRAS 23166+1655 A) and LL Pegasi B (IRAS 23166+1655 B) have an orbital period of c. 800 years.