Tuesday 15 June 2021

Isaac Roberts, M33 and a 5 inch Cooke


NEBULAS.—In KN., p. 158, there is a photograph by Dr. Isaac Roberts of the region of the spiral nebula Messier 33 Trianguli. The centre of the plate is about R.A. 1h 2 8M , Dec. N. 30° 7', and the area of the sky covered is 8.1° from N. to S. and 6.1° from preceding to following, the nebula being in the centre.

The photograph was taken with the Cooke 5-in. lens on November 14, 1895, with exposure of the plate during 2 h 15m . 

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