Abstract
MISSING NEBULÆ.—In Mr. Ellery's Report, to which reference was made last week, it is stated that “two nebulæ, H 4223 and H 1561, widely separated from each other, and described by Herschel as prominent objects, cannot now be found, although careful search has been made for them.” The first of these nebulæ is near the cluster Dunlop 413: in the “General Catalogue” it is called “a remarkable object,” but being very large and faint, it might, perhaps, be suspected that its invisibility in the Melbourne reflector is owing to the same cause that has led to the Pleiades-nebula, and other similar diffused objects (as G. C. 132, 4570, 5051) being overlooked in very large telescopes though obvious in much smaller ones. But in the case of H 1561 no such supposition is admissible. It was observed by Sir John Herschel on five occasions, in sweeps made between December, 1834, and February, 1836; when best seen it was termed pretty bright, from 25″ to 35″ in diameter, gradually brighter towards the centre, and situate to the south of, though very near to, three stars of the eleventh magnitude. Taking a mean of the five observations of position, and reducing to 1880, its R.A. is 7h. 35m. 8.0s. and N.P.D., 159° 0′ 46″.
Article PDF
Rights and permissions
About this article
Cite this article
Our Astronomical Column . Nature 19, 221–222 (1879). https://doi.org/10.1038/019221e0
Issue Date:
DOI: https://doi.org/10.1038/019221e0