NGC/IC Project Restoration Effort

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NGC6582

 

Basic Information


Location and Magnitude


Right Ascension: 18:11:1.8
Declination: +49:54:41
Constellation: HER
Visual Magnitude: 13.9

Historic Information


Discoverer: Swift L.
Year of discovery: 1884
Discovery aperture: 16.0

Observational


Summary description: eeF, pS, R
Sub-type: E-S0

Corwin's Notes

===== NGC 6582. Swift says of this "eeF, pS, R; in vacancy, bet. 6 sts like sickle in Leo, and 4 like [alpha], [beta], [gamma], and [delta] Ursae majoris." His position falls in an empty place in a group of galaxies, the brightest two of which he could have picked up. All the stars are on the sky, but are far enough from the candidate galaxies, that either could be Swift's object. CGCG 254-023, a double system, is usually taken as NGC 6582, though CGCG 254-021 just half a magnitude fainter may also be a reasonable possibility. The declination is less than an arcminute north, and is actually closer to Swift's than -023; the RA is further off, however. I'm going to stick with the classical identification with CGCG 254-023 because of the RA and brightness, but did want to call attention to the residual uncertainty here.

Steve's Notes

===== NGC 6582 24" (7/28/16): at 260x; the brighter eastern member (MCG +08-33-030) of the NGC 6582 pair appeared fairly faint to moderately bright, fairly small, round, 30", fairly sharp concentration with a small bright core. The western member of the pair (MCG +08-33-028) appeared faint to fairly faint, very small, round. Contains a very small bright nucleus and a faint 15" halo. The centers of the two galaxies are separated by 33" WNW-ESE and the halos are just separated. NGC 6582 is the brightest in a group of galaxies at roughly 700 million l.y. MCG +08-33-026, located 6' W, appeared fairly faint, small, round, 15" diameter, weak concentration to the center. A mag 15.0 star is off the NW side [27" from center]. This galaxy is often misidentified as NGC 6582. UGC 11149, 3' SE, is faint, small, slightly elongated NNW-SSE, ~20"x15", very small slightly brighter nucleus. A group of 5 stars is close south and east with a mag 11.5 star 1.5' E. MCG +08-33-023, 13' WNW, is faint to fairly faint, fairly small, round, 20" diameter, weak concentration. 17.5" (7/22/01): the eastern component of this double system is faint, fairly small, round, ~30" diameter. Just off the northwest end is MCG +08-33-029, a fainter companion that was cleanly resolved in good seeing. It appeared very faint, very small, slightly elongated, 0.3'x0.2'. CGCG 254-021 (often misidentified as NGC 6582), located 6' W, appeared very faint, extremely small, round, 10" diameter. A mag 15 star is close northwest [28" between centers] 17.5" (8/1/89): this is the following member of a double system. Faint, small, round, weak concentration, faint stellar nucleus. A companion is very close west just 33" separation between centers and appears very faint, small, round, low surface brightness.