NGC 247

From time to time I obtain data sets from remote observatories. One of my favorite providers is Telescope Live, which operates high-quality imaging systems in Chile, Australia, and Spain. In 2022 I received a beautifully deep dataset of the galaxy NGC 247, located in the constellation Cetus. The combination of long integration time and superb southern-hemisphere skies makes this dataset far superior to what I could capture from my own location.

Scientifically, NGC 247 is a member of the Sculptor Group, one of the closest groups of galaxies beyond our Local Group. Classified as an intermediate spiral galaxy (SAB(s)d)), it shows a noticeably lopsided structure, with one side of the disk much more populated with star-forming regions than the other. This asymmetry is thought to be linked to gravitational interactions within the Sculptor Group, making NGC 247 an interesting case study in environmental galaxy evolution.

The galaxy also features several bright H II regions, a patchy dust lane, and a prominent dark void—a large underluminous region in the disk that may have been caused by a past interaction or by stochastic star-formation processes. With deep imaging, the galaxy’s faint outer disk and stellar halo become visible as well, revealing subtle tidal features and extended low-surface-brightness structures.

Data calibration and registration and the final processing was done with PixInsight. The result was as follows: