What periodic comets do you know? What are their approximate distances from the Sun?

Halley’s comet period T = 76 years, comets move in elongated orbits, their distances vary within wide limits. Perihelion of Halley’s comet q = 0.59 AU, aphelion Q = 17.8 AU. The short-period comet Encke T = 3.3 years, q = 0.34 au, Q = 2.21 au.

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