NGC/IC Project Restoration Effort
(This is a very very beta version)
NGC4209
Basic Information
Location and Magnitude
Right Ascension: 12:15:40.9
Declination: +28:28:14
Constellation: COM
Visual Magnitude: 11.3
Historic Information
Discoverer: Herschel W.
Year of discovery: 1785
Discovery aperture: 18.7
Observational
Summary description: F, pS
Sub-type: *3
Corwin's Notes
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NGC 4209 may be NGC 4185. Or it may be a star about 2 arcmin south-southwest
of WH's position.
The problem with equating N4209 and N4185 (which is about 2 minutes west of
N4209) is that WH found them both during the same sweep (396 on 11 April
1785). Dreyer's note in the Scientific Papers is a bit misleading as it
suggests that the position of NGC 4209 is somehow dependent on that of NGC
4196 (which precedes NGC 4209 by 1min 18sec in the sweep) -- it is not. NGC
4196 indeed has its transit recorded to a full minute only, but NGC 4209 has
both minutes and seconds recorded. Dreyer was right, however, that JH, d'A,
and Bigourdan all did not find the object.
I also do not see anything in the sweep that would suggest that either NGC
4185 or NGC 4209 was observed out of order, or that they could be the same
galaxy. However, Dreyer has shown us (see e.g. NGC 4208) that WH, at least
once, probably unknowingly observed the same galaxy twice in the same sweep.
But that does not seem to have happened here.
Wolfgang Steinicke has chosen the star noted above as being N4209. This is
certainly possible as there is nothing else within 5 arcmin of WH's position
that he could have seen. However, WH's description "F, pS" does not give us
very much to go on. The size "pS", by the way, would make the object larger
than NGC 4196 which is described as "F, S". If it were the star, I would have
expected WH to say "vS" or "eS". Perhaps there was a momentary burst of very
bad seeing ...
At the moment, I favor taking Wolfgang's star, but am not yet convinced that
this is WH's object.