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Type: star (single)
Mag: B=?, V=?
NGC 7403 is a star, another of those mistaken for a nebula by the Harvard observers in the late 1850's. The NGC position is more accurate than that published in AN, and probably comes from the Harvard Zone catalogue. Dreyer's note in the first IC indicates some interest in the object, and shows that Coolidge was the only observer to suspect any nebulosity around the star.
S. Coolidge observed and described this object as a slightly nebulous star. Spitaler and Burnham did not see any nebulosity.
Publ.Lick.Obs. Volume 2. "Observations of Nebulae with the 36-inch Refractor of the Lick Observatory", p 168.
This was discovered by Coolidge at the Harvard Obs. The description is 'star slightly nebulous' A careful examination shows that there is certainly nothing of the kind in the assigned place. It should be about 7' north of a 9m star. In sweepng over this regionI found a mod.B neb which is prob. the object in question. It is 38s f. and 39.5'' n. ... The nebula has a 10th mag star 113'' distant in the direction of 230.4deg. about 15' north of this, and a little p., tehre is a clusster of five faint nebula (7396, 7397, 7398, 7401 and 7402) all but the first discovered with the Rosse reflector. There were readily found and appeared to be in the catalogue places."
(Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NF DC.
The Messier objects
The Bennett objects
The Caldwell list
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