{"id":155,"date":"2013-10-09T22:02:44","date_gmt":"2013-10-09T22:02:44","guid":{"rendered":"http:\/\/www.cantabsoftware.co.uk\/astrodb\/?p=155"},"modified":"2013-10-09T22:02:44","modified_gmt":"2013-10-09T22:02:44","slug":"m31-andromeda-up-close","status":"publish","type":"post","link":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/?p=155","title":{"rendered":"M31 &#8211; Andromeda up close"},"content":{"rendered":"<p>I am still not happy with the auto-guider accuracy, the graph showing anything up to 1 pixel plus or minus. This improved by making sure the RA axis was pulling against gravity but my next step is to recheck the polar alignment. I should be able to get to within +\/- 20% of a pixel IMHO. Anyway, here is a low res image of M31 of 8 luminance subs at 240s and 1&#215;1 binning and 5x60s\u00a0RGB subs at 2&#215;2 binning. Images were calibrated in Maxim DL, scaled in Fits Liberator using ArcSinh(x) function. Photoshop zone processing was done using curves and levels and the luminance frame then had a high pass filter applied. Finally, the LRGB frames where combined in Photoshop.<\/p>\n<p>This picture really needs a focal reducer to capture more of the (rather large) Andromeda Galaxy.<\/p>\n<div id=\"attachment_156\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.cantabsoftware.co.uk\/astrodb\/wp-content\/uploads\/2013\/10\/M31-131005-8Lum240s1x1Bin-5RGB60s2x2Bin.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-156\" class=\"size-full wp-image-156\" title=\"M31-131005-8Lum240s1x1Bin-5RGB60s2x2Bin\" src=\"http:\/\/www.cantabsoftware.co.uk\/astrodb\/wp-content\/uploads\/2013\/10\/M31-131005-8Lum240s1x1Bin-5RGB60s2x2Bin.jpg\" alt=\"M31\" width=\"800\" height=\"602\" srcset=\"https:\/\/www.cantabsoftware.co.uk\/astrodb\/wp-content\/uploads\/2013\/10\/M31-131005-8Lum240s1x1Bin-5RGB60s2x2Bin.jpg 800w, https:\/\/www.cantabsoftware.co.uk\/astrodb\/wp-content\/uploads\/2013\/10\/M31-131005-8Lum240s1x1Bin-5RGB60s2x2Bin-300x225.jpg 300w, https:\/\/www.cantabsoftware.co.uk\/astrodb\/wp-content\/uploads\/2013\/10\/M31-131005-8Lum240s1x1Bin-5RGB60s2x2Bin-398x300.jpg 398w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><p id=\"caption-attachment-156\" class=\"wp-caption-text\">M31<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>I am still not happy with the auto-guider accuracy, the graph showing anything up to 1 pixel plus or minus. This improved by making sure the RA axis was pulling against gravity but my next step is to recheck the &hellip; <a href=\"https:\/\/www.cantabsoftware.co.uk\/astrodb\/?p=155\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-155","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=\/wp\/v2\/posts\/155","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=155"}],"version-history":[{"count":3,"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=\/wp\/v2\/posts\/155\/revisions"}],"predecessor-version":[{"id":159,"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=\/wp\/v2\/posts\/155\/revisions\/159"}],"wp:attachment":[{"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=155"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=155"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cantabsoftware.co.uk\/astrodb\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=155"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}