NGC 1313 — Galaxy in Reticulum

NGC 1313 is a barred spiral in Reticulum, about 14 million light-years away, sometimes nicknamed the Topsy Turvy Galaxy for its strikingly disordered appearance. Its disk is asymmetric, knotty, and lopsided, with vigorous star formation scattered unevenly across it and no clear grand design. The morphology suggests recent gravitational disturbance, but no obvious companion has been found — it appears to be an isolated galaxy whose chaotic structure is intrinsic. NGC 1313 hosts several luminous young star clusters and at least two ultraluminous X-ray sources.

From a dark southern-hemisphere site, an 8-inch telescope at 100x shows a moderately bright oval glow with patchy structure and an uneven central condensation rather than a single sharp nucleus. A 12-inch begins to resolve the brightest knots as separate brightenings within the disk. The galaxy lies at declination -66 degrees in deep southern Reticulum and is essentially inaccessible from much of the northern hemisphere. Best observed October through February.

Discovered by James Dunlop on 27 September 1826 from Parramatta, New South Wales. Sandage's mid-20th-century Hubble Atlas highlighted NGC 1313 as a striking example of a peculiar barred spiral, and it has remained a popular target for studies of starburst activity and ULX populations.