NGC/IC Project Restoration Effort

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NGC3423

 

Basic Information


Location and Magnitude


Right Ascension: 10:51:14.4
Declination: +5:50:24
Constellation: SEX
Visual Magnitude: 11.1

Historic Information


Discoverer: Herschel W.
Year of discovery: 1784
Discovery aperture: 18.7

Observational


Summary description: F, vL, R, vgbM, rr
Sub-type: Sc

Corwin's Notes

===== NGC 3423. See NGC 3401.

Steve's Notes

===== NGC 3423 48" (4/16/15): very bright, large, slightly elongated SW-NE, ~3'x2.5', large bright core. A mag 15.8 star is superimposed on the SSW side, 1.2' from center. Spiral structure is evident at 488x, particularly along a curving outer arm running from clockwise from east to north. This arm contains three HII knots. An obvious faint knot, 8"-10" diameter, is at the north end 1.1' from center. The brightest knot is at the northeast end of the halo 1.1' from center, and it appeared fairly faint/faint, round, 12" diameter. The faintest knot (SDSS J105118.10+055024.7) is directly east of center by 1.0' and noted as very faint, round, 6" diameter. In addition to these three, a 4th knot is due south of center by 0.6'. This HII region was very faint, round, 8" diameter. Two additional objects were seen just off the south side of NGC 3423, but these are separate galaxies. 2MASX J10511769+0548323, situated 2.0' SE of the center, is fairly faint to moderately bright (V = 15.7), small, round, moderate surface brightness, 15" diameter. 2MASX J10511769+0548323, 2.0' S of center, is very faint (V = 17.1), very small, ~9"x6" SW-NE. This latter galaxy has a redshift of z = .069 and lies far in the background at a light-travel time of ~920 million years. 17.5" (4/6/91): moderately bright, fairly large, elongated 3:2 SSW-NNE, 3'x2', fairly low surface brightness, elongated bright core appears offset to the west. Has a faint halo which seems more extensive to the east of the core. Two mag 12/13 stars are off the NE edge with the mag 12 star 2.4' from the center.