Arp 120 consists of NGC 4438 (UGC 7574, VV 188 and others), the spiral being distorted by NGC 4435 (UGC 7575 and others), a barred lenticular. Arp lumped these into his E-like Galaxies Perturbing Spirals class. Both are located approximately 54 million light-years away in Virgo.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged May 9th and June 2nd and 3rd, 2016 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.