A starburst galaxy in Columba, NGC 1808 is about 40 million light-years distant. Starburst activity, as well as the warping of the outer spiral arms, has been credited to tidal interaction with nearby galaxy NGC 1792.
Imaged by SSRO/PROMPT/CTIO in 2011 using a 16″ RCOS at f/11.3 with an FLI 16803 on a Planewave 200HR mount. Image scale 0.41″/pixel. LRGB with 6 hours Lum, 4 hours Red, 2.5 hours Green, 4 hours Blue, and 3.5 hours Ha, all unbinned. The processing was a collaboration between Warren Keller (who uses primarily PixInsight) and myself (who uses mostly Photoshop).