Photographs of Comet 117P/Helin-Roman-Alu This page contains images of the comet 117P/Helin-Roman-Alu Photograph of Comet 117P/Helin-Roman-Alu at 2013-06-07T12:58:48.570 UTC using 12″ SCT telescope at 2200mm focal length, with ST8-XME camera at bin 1×1 equating to approximately 0.86 arc seconds per pixel. 8 x 300 second exposures averaged. Photograph of Comet 117P/Helin-Roman-Alu at 2013-06-03T13:41:55.686 UTC using 12″ SCT telescope at 2200mm focal length, with ST8-XME camera at bin 1×1 equating to approximately 0.86 arc seconds per pixel. 5 x 180 second exposures averaged. Photograph of Comet 117P/Helin-Roman-Alu at 2013-06-03T13:41:55.686 UTC using 12″ SCT telescope at 2200mm focal length, with ST8-XME camera at bin 1×1 equating to approximately 0.86 arc seconds per pixel. 5 x 180 second exposures averaged. Image inverted. Share this:EmailFacebookTwitterMoreLinkedInPocketRedditPinterestTumblr