NGC/IC Project Restoration Effort

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NGC4555

 

Basic Information


Location and Magnitude


Right Ascension: 12:35:41.0
Declination: +26:31:26
Constellation: COM
Visual Magnitude: 12.4

Historic Information


Discoverer: Herschel W.
Year of discovery: 1785
Discovery aperture: 18.7

Observational


Summary description: B, pS, iR, vsmbM * 12
Sub-type: E3

Corwin's Notes

===== NGC 4555 = IC 3545. Here is another case where Wolf made a mistake in identifying an NGC object on one of his plates. He put the NGC number on a faint object (this one about 2 arcmin south of the brighter galaxy) that could not have been seen by the Herschels, and recorded the correct brighter object as a new nebula. This led Dreyer to give it the IC number, apparently without checking the descriptions too closely. Wolf's error could have been a simple blunder, but I suspect that he simply put too much faith in the NGC position without thinking too much about the relative visibility of the objects. This has left his object number 210 without either an NGC or IC number. For lack of a better alternative, I've labeled it "NGC 4555A".

Steve's Notes

===== NGC 4555 17.5" (4/13/02): fairly faint, fairly small, elongated 3:2 WNW-ESE, 1.0'x0.7', very small bright core. With averted vision the major axis increases a little and the core seems irregular with a fleeting impression of a knot on the preceding side of the core. Located 33' NNW of NGC 4565!