101 Must-See Cosmic Objects: NGC 253

101 Must-See Cosmic Objects: NGC 253

The Silver Dollar or Sculptor Galaxy is the brightest deep-sky object within the diminutive constellation Sculptor. NGC 253 is very inclined at 78° from face-on, and doesn’t have distinct arms throughout its broad, 27.5′ by 6.8′ disk. Recent imaging exhibits a poorly developed bar and two concentrated arms amidst a disk wealthy in darkish and emission nebulae.

At eighth magnitude, NGC 253 will be seen in binoculars and is about 7° south of Beta (β) Ceti. Slightly bigger optics could permit you to observe the small nuclear brightening, and even bigger apertures will reveal some granulation from the abundance of dust clouds. Without distinctive arms, the mottled disk is worthy of scrutiny.

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NGC 253 is situated 11 million light-years from us and is the most important within the Sculptor Galaxy Group, one of many closest galaxy teams to ours. It is so shut that different members are scattered in different constellations, together with NGC 247 in Cetus and NGC 625 in Phoenix. This group is dominated by low-mass irregular galaxies just like the Large and Small Magellanic Clouds; its members are greatest seen in massive optics as a result of they vary from tenth to sixteenth magnitude.

The Silver Dollar Galaxy is about as removed from the aircraft of the Milky Way as attainable, situated round 2° from the South Galactic Pole. That means we’re trying by a minimal quantity of interstellar dust. The nearest shiny deep-sky object (1.8° southeast) is the magnitude 8 globular cluster NGC 288. It’s value noting that though most globulars are near the Milky Way’s galactic aircraft, at 37′ northeast of the South Galactic Pole, NGC 288 is about so far as a globular cluster can get in obvious place (however not bodily distance) from the aircraft.

Make certain to discover Astronomy’s full list of 101 cosmic objects you must see. New entries will probably be added every week all through 2022.

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