Carte-de-visite (CDV) depicting Paymaster Horace Parnell Tuttle in his naval officer’s uniform. Verso bears Matthew Brady’s imprint with pencil identification. Fine clarity and excellent condition.

Horace Parnell Tuttle (March 17, 1837–August 16, 1923) was an American astronomer and Civil War veteran. Tuttle discovered or co-discovered numerous comets, and the asteroid 5036 Tuttle was named in his honor. Tuttle is also credited with the discovery of galaxies NGC 2655 in Camelopardalis and NGC 6643 in Draco.

During the civil war, Horace Tuttle enlisted in the 44th Massachusetts Volunteer Infantry and served at New Bern, North Carolina. It would be through the intervention of former Harvard president Edward Everett that Tuttle was given a commission in the U. S. Navy and as paymaster. He served on a number of vessels, including the monitor USS Catskill, where he participated in the blockade of Charleston Harbor and the capture of the blockade runner "Deer". Tuttle was appointed Acting Assistant Paymaster, February 17, 1863, Assistant Paymaster, July 2, 1864, and Paymaster, May 4, 1866. He continued to make astronomical observations during the war, reporting on the 1864 appearance of Comet Tempel 1864 II from the deck of the Catskill. After the war Tuttle was sent to South America, Europe, and the Pacific, making scientific observations on Naval survey vessels.

- The Tuttles of Harvard College Observatory: 1850–1862 (Schmidt 2012)