NGC/IC Project Restoration Effort

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NGC4486

 

Basic Information


Location and Magnitude


Right Ascension: 12:30:49.4
Declination: +12:23:26
Constellation: VIR
Visual Magnitude: 8.6

Historic Information


Discoverer: Koehler
Year of discovery: 1779
Discovery aperture:

Observational


Summary description: vB, vL, R, mbM, 3rd of 3
Sub-type: E2/P

Corwin's Notes

===== NGC 4486 = M 87 is the second brightest galaxy in the Virgo Cluster. NGC 4472 = M 49 is the brightest. Also see NGC 4579.

Steve's Notes

===== NGC 4486 48" (5/4/16): at 488x, 610x and 697x; M87's jet was almost continuously visible as a small, very thin spike extending to the west-northwest of the core, perhaps 20"x2". When the seeing was sharp, there was a brighter, knot (stellar) at the outer tip that sometimes appeared detached. There was a strong impression of a second stellar knot within the spike. 48" (4/1/11): at 488x, the jet in M87 was immediately noticed as a short, faint spike poking out of the central core to the WNW and the position angle [290-300¡] was accurately sketched without prior knowledge. The narrow jet brightened or there was a knot at the outer tip. In addition to looking for the jet, I sketched three companions at the edge of the outer halo on the southwest side. About 2' SW of the center of M87 is a pair of very faint, roundish galaxies, both ~15" diameter. The pair forms UGC 7652 with the components separated by 40" and nearly aligned with the center of the galaxy as if they were ejected. 2MASX J12303903+1222222, an extremely faint companion (V = 17.9), lies 2.8' WSW of the core, just 20" SE of a mag 15.5 star. The three close "companions" to M87 are actually part of a distant, poor cluster in the background of M87, with a redshift of 20x that of M87! Virgo UCD 3 is either one of the brightest globular clusters in M87 or a nucleated dwarf galaxy, called a Ultra-Compact Dwarf (UCD). It is situated just 3.0' NE of the center of M87, directly opposite the two small galaxies at the southwest edge of the halo of M87. A mag 14.5 star, just 20" SSW, is a perfect reference to focus on the cluster. On 4/16/13 using 488x it was suspected as an 18th magnitude "star", but I didn't feel confident of the observation. At 813x, though, it was confirmed as an extremely faint, stellar object, glimpsed several times at the same position. 24" (5/29/14): extremely bright, large, slightly elongated NNW-SSE, ~4'x3.5', well concentrated with a large, intense core. The core brightens but there was no distinct nucleus. The halo gradually fades and increases in size with averted vision. Several galaxies are nearby including NGC 4486B 7.2' NW, NGC 4486A 7.6' SSE, NGC 4478 8.7' SW and NGC 4476 12.6' WSW. 17.5" (5/23/87): very bright, fairly large, gradually increases to a very bright core, no sharp nucleus. A very compact galaxy NGC 4486A = UGC 7658 lies 7' S. 13" (5/14/83): very bright, intense core, fairly smooth halo.