NGC/IC Project Restoration Effort
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NGC4560
![](Images/negative_NGC4560-ngcicproject.jpg)
Basic Information
Location and Magnitude
Right Ascension: 12:34:2.8
Declination: +7:41:56
Constellation: VIR
Visual Magnitude: 9.3
Historic Information
Discoverer: Herschel W.
Year of discovery: 1785
Discovery aperture: 18.7
Observational
Summary description: cB, pL, R, gbM
Sub-type: SB0
Corwin's Notes
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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.
Steve's Notes
=====
NGC 4560
See observing notes for NGC 4526.