NGC/IC Project Restoration Effort

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NGC3198

 

Basic Information


Location and Magnitude


Right Ascension: 10:19:54.9
Declination: +45:33:0
Constellation: UMA
Visual Magnitude: 10.3

Historic Information


Discoverer: Herschel W.
Year of discovery: 1788
Discovery aperture: 18.7

Observational


Summary description: pB, vL, mE 45°, vgbM
Sub-type: SBc

Steve's Notes

===== NGC 3198 48" (5/4/16): at 375x; NGC 3198 is a showpiece, large spiral extending 7:2 SW-NE, ~8.0'x2.5'. Contains a bright, elongated central "bar", punctuated by a very small bright core that rises to a stellar nucleus. Slightly brighter patches are visible at the ends of the central region, where the spiral arms emerge. A tight inner arm is attached on the northeast end; it bends back sharply and closely parallels the central region, extending southwest for a length of ~3.5'. An outer low surface brightness arm sweeps clockwise on the southwest end. A symmetric outer arm on the northeast end (of slightly higher surface brightness) curls clockwise towards the west. The outer tip to tip diameter is nearly 8'. An uncatalogued fairly bright double star [separation ~3.7"] is 3.5' NNE of center, just beyond the halo and a mag 14 star is 2.2' SSE of center. 17.5" (3/12/94): fairly bright, large, very elongated 3:1 SW-NE, 7.0'x2.5', broadly concentrated, brighter core has an indistinct elongated nucleus and an irregular surface brightness. Two mag 14 stars are close south (nearest is 2.0' from the center) and a mag 11 star is just off the NNE edge 3.5' from the center.