William Lassell and the Discovery of Neptune

Holden E. , “Historical note relating to the search for the planet Neptune in England 1845–6”, Astronomy and astrophysics, xi (1892), 287–8.

Ibid., 288. Grosser's account of the story is given in Grosser M. , The discovery of Neptune (Cambridge, Mass., 1962), 92.

Airy G. B. , “Account of some circumstances historically connected with the discovery of the planet exterior to Uranus”, Monthly notices of the Royal Astronomical Society, vii (1846), 121–44, p. 137.

Airy G. B. to Challis J. , 19 December 1845, and Lassell W. to Challis J. , 27 December 1845, both Cambridge Observatory Archives. I am most grateful to Dr David Dewhirst for bringing these letters to my attention.

Lassell W. to Challis J. , 16 February 1846, Cambridge Observatory Archives.

These journals are now in the Archives of the Royal Astronomical Society.

The Lassell notebooks are now in the Archives of the Royal Astronomical Society.

Lassell W. to Herschel J. , 7 September 1846, Herschel papers (H.S. 11.129), Royal Society.

Lassell notebook 9.7, entry for 2 October 1846, Lassell papers, Royal Astronomical Society.