Note 9 — PART I. CLASSIFICATION OF NEBULAE
Reading edition
N.G.C. 4486 (M 87) may be an exception. On the best photographs made with the 100-inch reflector, numerous exceedingly faint images, apparently of stars, are found around the periphery. It was among these that Belanowsky’s nova of 1919 appeared. The observations are described in Publications of the Astronomical Society of the Pacific, 35, 261, 1923.