NGC/IC Project Restoration Effort

===== NGC 4560 is probably NGC 4526 with a 2 minute error in the RA. Discovered by WH, it was also observed by JH who gave a similar description. JH marked the RA uncertain, however -- I wondered if he simply adopted the RA measured by his father. So, I checked the sweep. The RA was apparently measured normally, but no wire number is given. Instead, an illegible note appears in the column usually devoted to the wire number. This same note appears in many other of JH's observations. And in his "fair copy" of sweeps 1 to 107, the letter M occurs often, apparently meaning the middle of the field. In that case, the RA will indeed be approximate; and it does indeed appear in brackets on the page in the sweep showing the final reduced place. The declination reading is in also brackets, usually a sign that the measurement is uncertain, or is taken from JH's "working list", prepared from WH's observations. The reduced declination, however, is not marked as unusual in any way, so the brackets in the observation column are (currently) mysterious, at least to me. In any event, the declinations of N4526 and N4560 are the same, and the 2.0 minute RA difference is exact to within the errors. Whatever happened, there is nothing in the Herschel's position for N4560. The description agrees with the appearance of NGC 4526 with one exception -- N4526 is quite extended, while N4560 is described by both Herschel's as "round." This is the main problem with the notion of the identity, but I find the exact RA difference, combined with identical declinations, arguing pretty compellingly for the identity.

===== NGC 4560 See observing notes for NGC 4526.