The third component was a very faint, extremely small "knot", perhaps 4" diameter (barely nonstellar), that was superimposed south of center. It formed the north vertex of a small equilateral triangle (sides 15"-20") with the pair of stars. This "knot" is classified as the ring nucleus (Arp 145:RN) in Madore's 2009 "Atlas of Collisional Ring Galaxies". Arp 145 is located just 3.7' SE of mag 5.8 HD 14622 and the star was kept out of the field to avoid glare. The ring and collider are given two PGC numbers, 9060 and 9062, although there is disagreement in NED and LEDA on which objects they apply to.

Arp 145 is located 42' SW of the center of AGC 347 and it has a matching redshift, so is an outlying member of the cluster.

900/1200mm - 48" (10/25/11): at 488x and 610x, this interesting ring galaxy (Arp 145) was composed of three components. The brightest is the "collider" component (Anon 0220+41A) at the southeast edge of the "ring". It appeared moderately bright, small, round, 20" diameter, high surface brightness, containing a very small bright nucleus. The "ring" component generally appeared as a fairly large, roundish glow, at least 1.0' diameter, with an irregular surface brightness but no central brightening. A 20" pair of mag 12/13 stars are superimposed on the south and southwest end of the glow and detract a bit from viewing. Occasionally, though, the "ring" popped and a brighter rim and darker center appeared, mimicking a fairly large, weakly annular planetary nebula!

Notes by Steve Gottlieb