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Home Astronomy

Messier 74’s face-on magnificence in Pisces  – Astronomy Now

October 17, 2023
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Messier 74’s face-on magnificence in Pisces  – Astronomy Now
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M74 is without doubt one of the greatest spiral galaxies of the autumn sky however its low floor brightness could make it a troublesome seize in unfavourable observing circumstances. Picture: Adam Block

Messier 74 (NGC 628) is a spiral galaxy out of the top-drawer. This far-flung island universe yields awe-inspiring photos, its sweeping spiral arms being introduced within the ‘grand-design’ method. This time period is reserved for face-on spirals characterised by outstanding spiral arms that wrap across the nucleus in a trend much like the magnificent Whirlpool Galaxy (Messier 51), in all probability the archetypal grand-design spiral. 

Messier 74’s has two, well-defined spiral arms which might be much less chaotic than these of say Messier 101, one other member of the grand design membership, and a small but vibrant nucleus. Messier 74 seems virtually completely face-on to our perspective, it being tilted away from us by simply 5 levels. This helps astronomers to simply examine Messier 74’s spiral arms. We have now a front-row seat to hint mud lanes seen primarily of their interior area and younger, scorching blue star clusters and glowing pink, diffuse HII areas, websites of additional star formation, seen dotted alongside their complete size.

M74 could be discovered within the western areas of Pisces. AN graphic by Greg Smye-Rumsby.

Methods to observe

Messier 74 (NGC 628) is positioned within the far jap reaches of Pisces, the constellation whose western finish, together with its ‘Circlet’ asterism, lies to the south of the Nice Sq. of Pegasus. M74 is positioned north of Pisces’ fundamental line of stars which stretch from the Circlet to magnitude +3.8 Alrescha (alpha [α] Piscium) in its far south-east. It lies almost 15 levels north-west of Alrescha, however it could be simpler to search out by sweeping for it 10 levels south-west of brighter Hamal (alpha Arietis, magnitude +2).

At mid-month, M74 culminates (is highest within the native southern sky) at a beneficial altitude of round 55 levels at about 1am BST from southern England. It achieves an inexpensive altitude of above 30 levels within the east-southeast between 9pm and 5am BST. 

Messier 74 is a big galaxy which seems face-on to our line of sight. It covers 11 <M>x<M> 11 arcminutes throughout, a couple of third of the dimensions of the total Moon, and has a catalogued magnitude of +9.2. Primarily, this implies the equal of the concentrated gentle of a magnitude +9.2 star is unfold out over its complete face-on type, which sadly provides M74 a low floor brightness. 

The James Webb Area Telescope’s sharp focus has produced this beautiful, colourised picture from two of Webb’s devices NIRcam and MIRI, working at near- and mid-infrared wavelengths. It reveals cooler stars and dusty constructions solely hinted at beforehand. Picture: NASA, ESA, CSA, STSci.

Low floor brightness

Whereas deep-sky imagers of Messier 74 take pleasure in carte blanche, it’s typically a far completely different story for visible observers confronting the galaxy. All face-on spiral galaxies are blighted by low floor brightness to a point, together with the likes of the Whirlpool Galaxy, although Messier 74 has the unenviable fame as maybe the hardest visible goal within the Messier catalogue. Nonetheless, a pair of binoculars or a finderscope can reveal it as a fuzzy oval of sunshine on a positive, moonless evening at an observing web site free from main gentle air pollution. Use low powers when sweeping for M74 by way of a small telescope; an 80mm (~three-inch) refractor can present a round patch about 5 arcminutes throughout.

Upgrading to a 200mm- (eight-inch-) aperture telescope and ramping up the magnification reveals some mottling, this being the unresolved and faint traces of M74’s swish and well-ordered spiral arms surrounding its small core. Current-day deep-sky photos, ideally shot by way of long-focus telescopes, are breathtaking, displaying the galaxy at its photogenic greatest.

Hubble Area Telescope’s magnificent portrait of M74. Picture: NASA, ESA and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration



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