Arp 29: The fireworks galaxy (opens in new tab)

North is right. 0.55"/pixel (26'x26' field). FWHM=3.7" This one is in the Atlas of Pecular Galaxies under "one heavy arm", which checks out: the eastern arm (down) is considerably bighter and denser than the others. However, it's mostly known for it's bright star formation, and being close enough and it's close enough to resolve multiple HII regions and a bright star cluster: It's also had ten observed supernova, hence "fireworks galaxy". In the sky, it apears very close to the milky way, whi...