Horace Parnell Tuttle, Co-Discoverer of Swift-Tuttle Comet: 1862. August 7, 2016Full resolution (251 × 293) ← Previous Next → Horace Parnell Tuttle, Co-Discoverer of Swift-Tuttle Comet: 1862. Horace Parnell Tuttle, Co-Discoverer of Swift-Tuttle Comet: 1862.