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Going south in Sculptor – Astronomy Now

October 31, 2024
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Going south in Sculptor – Astronomy Now
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Magnificent NGC 253, the Silver Coin Galaxy in Sculptor. Picture: Warren Keller/Telescope Dwell.

Newbie astronomers simply love the problem of trying out these horizon-hugging southern constellations and searching for the deep-sky gems they host. On the time of the 12 months the nice southern constellation of Sculptor matches the invoice completely.

Sculptor is the biggest of the southern constellations invented ‍by ‍the ‍French ‍astronomer ‍Nicolas ‍Louis ‍de ‍Lacaille, in 1756. Initially ‍named by him ‍’‍l’Atelier ‍du ‍Sculpteur’, ‍the ‍sculptor’s ‍studio, it was shortened to Sculptor in 1845, following a suggestion by John Herschel.

From the south of England, everything of Sculptor simply clears the horizon at about 10pm GMT on the finish of October, although its northern boundary with Cetus has a declination of between 24 to 25 levels south. Sculptor offers largely in galaxies, with a few of the most interesting examples in the whole sky positioned on its premises. These of us residing at mid-northern latitudes can catch a glimpse of magnificent NGC 253, the massive and brilliant Silver Coin Galaxy that’s the most effective galaxy in Sculptor. As an amazing bonus, the excellent globular cluster NGC 288 lie simply to the south-east.

Flip for NGC 253, Sculptor’s Silver Coin, or Silver Greenback Galaxy

Sculptor hosts a reasonably barren, star-poor space of sky to the south of Cetus and Aquarius. Although alpha Sculptoris shines at solely fourth-magnitude it’s the constellation’s brightest star. NGC 253 lies 4.7 levels to its north-west and culminates mid-month at about 10.10pm GMT. From London, it then lies round 13 levels excessive, although it achieves an altitude of simply 9 levels from Scotland. NGC 253 is the brightest member of the Sculptor Group, a unfastened grouping of galaxies that’s one of many nearest to the Milky Method, mendacity simply 12.7 million mild years away.

AN Graphic by Greg Smye-Rumsby.

The Silver Coin Galaxy shines brightly at magnitude +7.1, although its high-surface brightness owing to its nearly edge-on presentation is a higher asset for UK observers. A 100mm (four-inch) telescope reveals a cigar-shaped object that’s oriented north-east to south-west on the sky. On an distinctive night time below a darkish sky, the Silver Coin’s main axis could strategy 20’ in size; to its fullest extent it spans 26’ x 7.4’.

NGC 55 is one other excellent giant spiral galaxy in Sculptor that seems edge-on. It makes a incredible goal for distant imaging. Picture: Matt Dieterich.

Sculptor could also be nondescript visually, however NGC 253 is only one of its effective number of brilliant galaxies, with NGC 55 being the cream of the remainder of the crop; each galaxies make excellent targets for distant imagers utilising gear hosted all over the world, particularly that primarily based within the Southern Hemisphere. There are quite a few different effective galaxies that may be noticed from southern Europe or remotely imaged. These embody NGC 134, NGC 613 and NGC 7793.

NGC 288: a effective globular cluster rivalling many Messier’s

When you’ve noticed the Silver Coin Galaxy, look slightly below two levels south and east and also you’ll see NGC 288, a powerful, magnitude +8.1 globular cluster that spans 14’.

The effective globular cluster NGC 288 in Sculptor. Picture: Bernhard Hubl.

On a clear and moonless night time (the moon is new on 1 November) at a website freed from main sources of sunshine air pollution, a small telescope of round 80mm (~three inches) in measurement ought to choose it up as; it lies about eight levels south-south-east of Diphda (beta [b] Ceti, magazine. +2) and three levels north-north-west of alpha (a) Sculptoris (magazine. +4.3).

NGC 288 is a unfastened cluster, with maybe a 200–250mm (eight- to ten-inch) resolving a peppering of its outlying stars at average powers on a gentle night time. Will probably be fairly a thrill to seek out and observe.

Head north for NGC 247, a bonus in Cetus

Being thus far south, why not now dip into the massive southern constellation of Cetus, the ocean monster, whose teeming galaxy fields are approaching the southern meridian by about mid-evening. Along with Aquarius and Pisces, Cetus may be considered one other member of the ’Celestial Water’ group of constellations. Cetus shares a part of its southern boundary with Sculptor.

Cetus boasts a few typically visited targets, with deep-sky devotees being very accustomed to Messier 77, the storied and oft-observed galaxy, and variable star observers monitoring Mira, the archetypal long-period variable star. Nonetheless, let’s head south to mine deeper into Cetus’ galactic heritage.

Spiral NGC 247 is the biggest galaxy in Cetus. Picture: Warren Keller/SSRO.

NGC 247 (Caldwell 62) is a big (spanning 20’ x 7.4’), inclined spiral that’s typically known as the ‘Dusty Spiral’ or the ‘Needles Eye’, owing it sporting a darkish patch on one aspect. NGC 247 is one other member of the Sculptor Group.

Observers on the lookout for NGC 247 will encounter two fast challenges: it by no means rises increased than 20 levels from the UK and, regardless of its inclined presentation, it suffers from low floor brightness, owing partly to its dusty disc with disorganised spiral arms.

One saving grace is that NGC 247 is straightforward to seek out, because it lies slightly below three levels south of Diphda (beta [β]) Ceti. On the finish of October from the south of England, NGC 247 culminates at simply after 10pm GMT, at an altitude of round 18 levels. A low-power view by means of a 100–150mm (four- to six-inch) telescope ought to snare it on a effective night time.



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