NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC1105
Basic Information
Location and Magnitude
Right Ascension: 2:43:41.9
Declination: -15:42:21
Constellation: CET
Visual Magnitude: 14.3
Historic Information
Discoverer: Leavenworth
Year of discovery: 1885
Discovery aperture: 26.3
Observational
Summary description: vF, vS, R
Sub-type: Sb
Corwin's Notes
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NGC 1105 = IC 1840 = MCG -03-08-004. My previous decision to list two
galaxies under the number "NGC 1105" was misguided. After reviewing the
evidence, I've decided to go with historical precedent and let Leavenworth's
sketch -- which clearly shows that N1105 = I1840 -- provide the final word.
However, for those still interested, here is the full story.
The NGC galaxy was found in 1885 by Leavenworth with the 26-inch refractor at
Leander McCormick Observatory. As with most of the faint nebulae discovered
visually with this telescope, the discovery position is crude, especially in
RA. Fortunately, Leavenworth has left us a sketch that shows conclusively
that his object is identical to IC 1840. The four stars to the west of the
galaxy -- looking like the top four stars in the cross of Cygnus -- are all
shown in the sketch along with the galaxy.
The second candidate comes from Herbert Howe. Working with the 20-inch
refractor at Chamberlain Observatory just outside of Denver, he could not find
anything at the position given by Leavenworth. However, "... four minutes
following was a very small nebula, about equal in brightness to a star of
magnitude 13. As Leavenworth observed his nebula only once, and took its
place roughly, the two may be identical." Dreyer took Howe's "may be
identical" as "indeed are identical" and put Howe's RA in the IC2 Notes with
only the qualification, "... (nothing in the place given by L.)."
So, we have two galaxies for one NGC number (where is Solomon when we need
him?!). My previous solution added "e" and "w" suffixes to the NGC number for
the two different galaxies. Not very satisfactory for the purist, I'm afraid,
but it did give some credit to each of the observers, and attempted to deal
with Dreyer's Note in IC2.
As I've said, however, my current sensibilities are offended by this Solomaic
decision, so I've reverted to using historical precedent and ignoring Dreyer's
Note. For what it's worth, the galaxy that Howe found is now called
MCG -03-08-036.
Steve's Notes
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NGC 1105
18" (11/26/03): very faint, small, slightly elongated SW-NE, 0.5'x0.4', broad concentration with a round 20" core. Located 6' NW of mag 8.9 SAO 148573. NGC 1081 lies 20' ENE.