A quiet void amid spiral arms – NGC 247’s mysterious gap in the stars
NGC 247 is a small spiral galaxy in the constellation Cetus, lying about 11 million light-years away and spanning roughly 70,000 light-years. On the sky it appears about 19.6 × 5.6 arcminutes across, making it one of the largest members of the nearby Sculptor Group.
NGC 247 is a galaxy of contrasts — its disk is streaked with dark dust lanes, scattered pink H II regions, and a striking asymmetry defined by a vast central void where star formation seems to have stopped. This silent zone, nearly 3,000 light-years wide, interrupts the spiral structure and gives the galaxy its curious, uneven character. The void may be the lingering imprint of a past interaction or the collapse of a massive gas cloud that failed to ignite new stars.
Though modest in luminosity, NGC 247 has an extended low-surface-brightness disk, its spiral arms faint and flocculent, with clusters of young blue stars embedded in diffuse starlight. These loose, broken arms contrast beautifully with the dusty inner lanes and delicate pink star-forming knots, giving the galaxy a quiet but unmistakable sense of depth.
Imaged in LRGB and H alpha on my Planewave CDK 1000 at Observatorio El Sauce, Chile.
Image acquisition and processing: Mike Selby