NGC/IC Project Restoration Effort

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NGC253

 

Basic Information


Location and Magnitude


Right Ascension: 0:47:33.1
Declination: -25:17:15
Constellation: SCL
Visual Magnitude: 7.2

Historic Information


Discoverer: Herschel C.
Year of discovery: 1783
Discovery aperture: 4.2

Observational


Summary description: !! vvB, vvL, vmE 54°, gbM
Sub-type: SBc

Steve's Notes

===== NGC 253 48" (10/23/14): although I've viewed NGC 253 several previous times with Lowrey's 48", I'm always amazed by the spectacular view as the mottled galaxy explodes into numerous bright knots, dusty patches, dark lanes and luminous star associations. Using a 21mm Ethos (232x), NGC 253 completely filled the 26' field. The central region of this starburst galaxy contains a blazing, nonstellar nucleus surrounding by an intense, elongated core with several bright patches around the periphery of the core (segments of the inner spiral arms). Just northwest and southeast of the nucleus are extremely bright sections of the core. Since the galaxy is only 12¡ from edge-on, many visible features extend parallel to the SW-NE major axis (PA = 52¡). A dark lane running SW-NE parallels the core just off its northern side. Close northwest and parallel to this dust lane is a very bright, fairly narrow arm, extending ~3' in length. Another thin arm (also running SW-NE) is to the southeast of the core with a prominent, very thin section ~3.5' SW of center, just southwest of a superimposed mag 12.5-13 star. Three smaller bright patches surround a superimposed star ~2.5' NE of the nucleus. The brightest and largest of these patches is close southeast of the star. Further northeast the surface brightness lowers in the outer portion of the galaxy, but it still appears curdled and blotchy. Several bright stars are near the periphery including a mag 9.3 star 6.2' SW of center and a mag 11.6 star 3.8' W of center. A brighter patch is ~3.5' WSW of center is near the latter star. Additional luminous patches are further out on the southwest end. 30" (10/12/15 - OzSky): superb view at 152x and 303x with NGC 253 within 10¡ of the zenith. Much of the detail seen in Lowrey's 48" was visible, although the bright patches were not quite as contrasty. The nucleus is a very small region embedded in a very bright, elongated central region that is enhanced immediately south of the nucleus. A thin, luminous "arm" extends in the direction of the major axis near the north side. A long spiral "arm" is along the northeast flank of the galaxy, extending 5 or 6' in length. Three slightly brighter patches were noted to the northeast of the core close to a superimposed star (also marked in the 48" observation). A bright, elongated strip was along the southwest side, about 2.8' NNW of a mag 9.3 star near the southwest edge (6.2' from center). 30" (11/5/10 - Coonabarabran, 264x): stunning view in the 13mm Ethos at 264x although the galaxy overfilled the 23' field. The dust structure and knots were mesmerizing but I didn't take detailed notes. 17.5" (8/29/92): at 100x; very bright, very large, edge-on 6:1 SW-NE, 30'x5', at 100x. The galaxy exhibits only a weak central concentration to a small elongated core that is slightly larger than the visible knots. Remarkable dust structure and mottling visible particularly on the southwest extension and a dark lane runs along the north side. Three faint HII knots are visible near a superimposed star on the southwest side and a slightly brighter knot lies northeast of a star near the core. 13" (9/11/82): very bright, elongated 4:1 SW-NE, very mottled, dust lanes, dark patches, 30' diameter. 8": very bright, very elongated, mottled, 25'-30' diameter. 10x30mm IS binoculars: easily visible as an elongated glow.