ACO 426 is a 12th magnitude Galaxy Cluster in the constellation Perseus. It is approximately 230 million light years from our solar system and has a diameter of about 5 million light years.
The spiral galaxy NGC 1275 is the brightest member of the complete Perseus cluster, and is also known as the radio source Perseus A. It is located around 235 million light years away, near the center of the large Perseus cluster of galaxies. Perseus A is also a strong X-ray source and is categorized as Seyfert galaxy. Other prominent members of the galaxy cluster are NGC 1260 (spiral), NGC 1267 (elliptical), NGC 1272 (elliptical), NGC 1273 (spiral), NGC 1274 (elliptical), and NGC 1278 (elliptical).