Dwingeloo 1 is a barred spiral galaxy about 10 million light-years away from the Earth,[3] in the constellation Cassiopeia.

[5] The galaxy was, however, first noted as an unremarkable feature on Palomar Sky Survey plates earlier in the same year, but was not recognized as such.

[5] It was also independently discovered a few weeks later by another team of astronomers working with Effelsberg 100-m Radio Telescope.

[6] Dwingeloo 1 was eventually named after the 25m radio telescope in the Netherlands that was used in the DOGS survey and first detected it.

[5] Dwingeloo 1 is a highly obscured galaxy, which makes distance determination a difficult problem.

[8] As of 2011, the distance to Dwingeloo 1 is thought to be approximately 3 Mpc, based on its likely membership in the IC 342/Maffei group.