NGC 6503 — Galaxy in Draco

NGC 6503 is a small inclined spiral galaxy in Draco, about 17 million light-years away, perched on the very edge of the Local Void — a vast, almost empty region of intergalactic space stretching away from our cosmic neighbourhood. The galaxy's loneliness has earned it the nickname 'Lost in Space' or 'Island in the Void.' It is a relatively low-luminosity Sc spiral with a small bright bulge, a tightly wound disk, and visible dust lanes when seen at high resolution. At magnitude 10.2 it is a comfortable telescope target despite its modest size.

A 4-inch at moderate power shows an elongated bright glow with a clearly brighter centre. An 8-inch at 150-200x reveals the inclined disk, a small concentrated nucleus, and hints of the dust lane along the eastern flank. A 12-inch begins to mottle the disk and bring out the asymmetry of the bulge against the dust patches. NGC 6503 sits in northern Draco near the bowl of the Little Dipper; star-hop from Mu Draconis about 6 degrees north-northwest. Best observed April through September.

Discovered by Arthur Auwers on 22 July 1854 — long after Herschel's sweeps, partly because its position in northern Draco lies outside the regions Herschel surveyed most exhaustively. NGC 6503 has been used extensively in observational cosmology because its location in such an empty region makes it a clean reference point for the local Hubble flow.