Harold Corwin

IC 405 is a very large diffuse nebula found by Schaeberle (PASP 4, 85, 1892) on plates taken with the "Willard" lens (6-inch aperture, 31-inch focal length; Barnard used the lens extensively, and discusses its history and characteristics in Lick Obs. Publ., Vol. 11, 1913). In his note, Schaeberle mentions four plates, the first on 27 February 1892 and three more on 21, 24, and 25 March 1892. His detailed description of the nebula matches that shown on the DSS blue plates. Wolf (AN 131, 157, 1892) confirmed the existence of the nebula on plates taken on 25 and 30 September of the same year.

Dreyer adopted Wolf's position for BD +34 980 (= HD 34078), but the nebula is actually centered north and east of the star. The position I adopt is for the apparent center of the brighter portion of the nebula on the red DSS2 plate. There, that brightest section is about 40' x 30' across, while the maximum extent is over a degree in the east-west direction.

― IC Notes by Harold Corwin

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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