NGC/IC Project Restoration Effort

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NGC549

 

Basic Information


Location and Magnitude


Right Ascension: 1:25:7.0
Declination: -38:0:26
Constellation: SCL
Visual Magnitude: 14.6

Historic Information


Discoverer: Herschel J.
Year of discovery: 1837
Discovery aperture: 18.3

Observational


Summary description: eeF, S, R, vgbM, 4th of 4
Sub-type: Sa

Corwin's Notes

===== NGC 549. Steve Gottlieb has suggested that the SGC identification of this galaxy is incorrect. He is almost certainly right, in spite of the poor right ascension from John Herschel (18 seconds of time off); Herschel's declination is correct, though. The SGC galaxy is 15 arcminutes south and 4 seconds of time east of Herschel's position. Though this is brighter, it does not match Herschel's description ("eeeF, S, R, vgbM. The 4th of a group of 4."). Instead, this matches very closely what I'd expect him to see based on his descriptions of the other three galaxies in the group (NGC 534, 544, and 546, all "eeF, S, R, vgbM"). Accepting Steve's identification, the only error is in Herschel's RA. For each of the other three galaxies, Herschel has two observations, but only lists one for N549. There are no significant zero point offsets in the differences between the raw positions for the other three galaxies. This means that we have no reasonable way to "correct" the original position of N549 as given by Herschel. This in turn means that we are left with only the description to help us identify the galaxy. And that points directly to the object which Steve (and the original ESO list 5 in A&A Sup) chose as NGC 549.

Steve's Notes

===== NGC 549 18" (12/17/11): extremely faint, fairly small, round, no structure, required averted vision. Located ~5' NNW of NGC 544/546 pair. Viewed at 11¡ elevation. 17.5" (11/1/97): not visible