His memoir On the Motion of Hyperion, a New Case in Celestial Mechanics, is in some respects one of his most original researches.
In 1837-1838 several essays of Longfellow's appeared in the North American Review, and in 1839 he published Hyperion: a Romance, and his first volume of original poetry, entitled Voices of the Night.
With the same instrument, he further detected, on the 19th of September 1848, Hyperion, the seventh of Saturn's attendants, and, on the 24th of October 1851, Ariel and Umbriel, the interior moons of Uranus.
C. Bond identified Hyperion; and he perceived, on the 15th of November 1850, Saturn's dusky ring, independently observed, a fortnight later, by W.
They are Ocean, Coeus, Crius, Hyperion, Iapetus, Theia, Rhea, Themis, Mnemosyne, Phoebe, Tethys and the youngest, Cronus, " and he hated his glorious father."
The dean was an elegant scholar, and his rendering of the Hyperion of Keats into Latin verse (1862) has received high praise.
Hyperion, a poetical account of his travels, had, at the time of its publication, an immense popularity, due mainly to its sentimental romanticism.