Themis (hypothetical moon)

On April 28, 1905, (5149.9 km) The same assumptions led him to a diameter of 42 miles (213 km).

[[Image:Themis orbit.gif|thumb|right|Two possible orbits for Themis, as calculated by W. H. Pickering.

In fiction

Philip Latham (pen-name of Robert S. Richardson), in his 1953 novel Missing Men of Saturn, has Themis collide with Titan, "getting rid of the little nuisance once and for all", according to the introduction.

John Varley's 1979 science fiction novel Titan is set aboard an expedition to Saturn. During the novel, as they approach the planet and prepare to enter orbit, the astronomer onboard discovers a new moon. At first she believes she has recovered Pickering's lost moon, so she names it Themis.

Robert Anton Wilson's 1979-1981 Schrödinger's Cat trilogy of novels makes frequent reference to Pickering's Moon as a satellite that revolves the "wrong way" (i. e. retrograde) around its primary. Likewise, the Principia Discordia asks in the novel: "Why does Pickering's Moon go about in reverse orbit?"

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Deguy: Le cosmos revue encyclopedique hebdomadaire des progres des sciences et de leurs applications aux arts et a l'industrie, p.421 (1861)
AnHar 53 (1905) 173
MNRAS 69 (1909) 215
Obs 28 (1905) 12:433
Obs 31 (1908) 8:295
Obs 32 (1909) 3:79
PASP 18 (1906) 96