{"id":1555,"date":"2022-05-11T11:51:21","date_gmt":"2022-05-11T15:51:21","guid":{"rendered":"http:\/\/mvas.org\/mvas_wp\/?p=1555"},"modified":"2022-05-11T11:51:22","modified_gmt":"2022-05-11T15:51:22","slug":"m51-the-whirlpool-galaxy-in-canes-venatici-5","status":"publish","type":"post","link":"https:\/\/mvas.org\/?p=1555","title":{"rendered":"M51 \u2013 The Whirlpool Galaxy in Canes Venatici"},"content":{"rendered":"\n
\"\"<\/a>
M51 \u2013 The Whirlpool Galaxy in Canes Venatici<\/figcaption><\/figure>\n\n\n

Telescope: Unitron 1<\/span><\/span><\/span>55<\/span><\/span><\/span> 4<\/span><\/span><\/span>\u201d f\/15 <\/span><\/span><\/span>refractor, <\/span><\/span><\/span>Atlas EQ-G<\/span><\/span><\/span><\/span><\/p>\n

Camera: Canon EOS Ra <\/span><\/span><\/span><\/span>full frame DSLR<\/span><\/span><\/span><\/span><\/p>\n

Filter: 2\u201d GSO IR Cut<\/span><\/span><\/span><\/span> Filter<\/span><\/span><\/span><\/span><\/p>\n

Guide scope: <\/span><\/span><\/span>Orion 50mm Guidescope, ASI120MM, PHD, Dithered every 4 subs<\/span><\/span><\/span><\/span><\/p>\n

Exposure: <\/span><\/span><\/span>1<\/span><\/span><\/span>0<\/span><\/span><\/span>x<\/span><\/span><\/span>24<\/span><\/span><\/span>0<\/span><\/span><\/span>sec, <\/span><\/span><\/span>ISO<\/span><\/span><\/span> 16<\/span><\/span><\/span><\/span>00<\/span><\/span><\/span><\/span>, saved as <\/span><\/span><\/span>RAW<\/span><\/span><\/span><\/p>\n

Darks: Internal (Long Exposure Noise Reduction)<\/span><\/p>\n

Flats: <\/span><\/span><\/span>32×1\/<\/span><\/span><\/span><\/span>1<\/span><\/span><\/span><\/span>0s <\/span><\/span><\/span><\/span>sky<\/span><\/span><\/span><\/span> flats taken at dusk<\/span><\/span><\/span><\/span><\/p>\n

Average Light Pollution: Bortle 8, <\/span><\/span><\/span><\/span>fai<\/span><\/span><\/span><\/span>r transparency<\/span><\/span><\/span><\/span><\/p>\n

Lensed Sky Quality Meter: 18.5 mag\/arc-sec^2<\/p>\n

Stacking: Mean with a 1-sigma clip<\/p>\n

White Balance: Nebulosity Automatic<\/p>\n

Software: Backyard EOS, Deepsky Stacker<\/span>, Nebulosity, Photoshop<\/span><\/p>\n

This field needs more subs and better conditions, but since I am limited to imaging on the east side of the meridian that will have to wait until next year.<\/p>\n

M51 is a beautiful face-on spiral galaxy in Canes Venatici, just south of Alkaid, the bright star that lies at the eastern end of the Big Dipper. The spiral arm that appears to connect M51 to the nearby companion (NGC 5195) is a bit of an illusion. The companion actually lies behind M51, and if you look closely you can see that the spiral arm is silhouetted against the background galaxy. Modern observations and computer modeling suggest that the companion has made at least two passes through the main disk of M51. During the first, it approached M51 from behind, passed through the face of the galaxy, swung around in an orbit that took it in front, and then back through the disk where it lies now behind M51. These passes set off bursts of star formation that gives the arms of M51 their beautiful blue color.<\/p>\n

M51 <\/span><\/span><\/span><\/span>is <\/span><\/span><\/span><\/span>currently <\/span><\/span><\/span><\/span>well placed high i<\/span><\/span><\/span><\/span>n the northeast during the <\/span><\/span><\/span><\/span>early<\/span><\/span><\/span><\/span> evening.<\/span><\/span><\/span><\/span><\/p>","protected":false},"excerpt":{"rendered":"

Telescope: Unitron 155 4\u201d f\/15 refractor, Atlas EQ-G Camera: Canon EOS Ra full frame DSLR Filter: 2\u201d GSO IR Cut Filter Guide scope: Orion 50mm Guidescope, ASI120MM, PHD, Dithered every 4 subs Exposure: 10x240sec, ISO 1600, saved as RAW Darks: Internal (Long Exposure Noise Reduction) Flats: 32×1\/10s sky flats taken at dusk Average Light Pollution: […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","pgc_sgb_lightbox_settings":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[14,15],"tags":[],"class_list":["post-1555","post","type-post","status-publish","format-standard","hentry","category-forums-beginner-imaging","category-forums-deepsky-imaging","entry"],"yoast_head":"\nM51 \u2013 The Whirlpool Galaxy in Canes Venatici - Miami Valley Astronomical Society<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mvas.org\/?p=1555\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M51 \u2013 The Whirlpool Galaxy in Canes Venatici - Miami Valley Astronomical Society\" \/>\n<meta property=\"og:description\" content=\"Telescope: Unitron 155 4\u201d f\/15 refractor, Atlas EQ-G Camera: Canon EOS Ra full frame DSLR Filter: 2\u201d GSO IR Cut Filter Guide scope: Orion 50mm Guidescope, ASI120MM, PHD, Dithered every 4 subs Exposure: 10x240sec, ISO 1600, saved as RAW Darks: Internal (Long Exposure Noise Reduction) Flats: 32×1\/10s sky flats taken at dusk Average Light Pollution: […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mvas.org\/?p=1555\" \/>\n<meta property=\"og:site_name\" content=\"Miami Valley Astronomical Society\" \/>\n<meta property=\"article:published_time\" content=\"2022-05-11T15:51:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-05-11T15:51:22+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/mvas.org\/wp-content\/uploads\/2022\/05\/M51-5-7-2022-2j.jpg?fit=1024%2C768&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"768\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"John Graham\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"John Graham\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555\"},\"author\":{\"name\":\"John Graham\",\"@id\":\"https:\\\/\\\/mvas.org\\\/#\\\/schema\\\/person\\\/4b76bddd1e4b80037c6412d592a6bcd6\"},\"headline\":\"M51 \u2013 The Whirlpool Galaxy in Canes Venatici\",\"datePublished\":\"2022-05-11T15:51:21+00:00\",\"dateModified\":\"2022-05-11T15:51:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555\"},\"wordCount\":284,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/mvas.org\\\/mvas_wp\\\/wp-content\\\/uploads\\\/2022\\\/05\\\/M51-5-7-2022-2j.jpg\",\"articleSection\":[\"Beginner Imaging\",\"Deepsky Imaging\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/mvas.org\\\/?p=1555#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555\",\"url\":\"https:\\\/\\\/mvas.org\\\/?p=1555\",\"name\":\"M51 \u2013 The Whirlpool Galaxy in Canes Venatici - Miami Valley Astronomical Society\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/mvas.org\\\/mvas_wp\\\/wp-content\\\/uploads\\\/2022\\\/05\\\/M51-5-7-2022-2j.jpg\",\"datePublished\":\"2022-05-11T15:51:21+00:00\",\"dateModified\":\"2022-05-11T15:51:22+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/#\\\/schema\\\/person\\\/4b76bddd1e4b80037c6412d592a6bcd6\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/mvas.org\\\/?p=1555\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#primaryimage\",\"url\":\"http:\\\/\\\/mvas.org\\\/mvas_wp\\\/wp-content\\\/uploads\\\/2022\\\/05\\\/M51-5-7-2022-2j.jpg\",\"contentUrl\":\"http:\\\/\\\/mvas.org\\\/mvas_wp\\\/wp-content\\\/uploads\\\/2022\\\/05\\\/M51-5-7-2022-2j.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/mvas.org\\\/?p=1555#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/mvas.org\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"M51 \u2013 The Whirlpool Galaxy in Canes Venatici\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/mvas.org\\\/#website\",\"url\":\"https:\\\/\\\/mvas.org\\\/\",\"name\":\"Miami Valley Astronomical Society\",\"description\":\"The Universe Is Yours to Discover\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/mvas.org\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/mvas.org\\\/#\\\/schema\\\/person\\\/4b76bddd1e4b80037c6412d592a6bcd6\",\"name\":\"John Graham\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/6594bdb62c6c4e3996ed828d3634de0cf766055de25500b0111229c5be714921?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/6594bdb62c6c4e3996ed828d3634de0cf766055de25500b0111229c5be714921?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/6594bdb62c6c4e3996ed828d3634de0cf766055de25500b0111229c5be714921?s=96&d=mm&r=g\",\"caption\":\"John Graham\"},\"url\":\"https:\\\/\\\/mvas.org\\\/?author=3\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"M51 \u2013 The Whirlpool Galaxy in Canes Venatici - Miami Valley Astronomical Society","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/mvas.org\/?p=1555","og_locale":"en_US","og_type":"article","og_title":"M51 \u2013 The Whirlpool Galaxy in Canes Venatici - Miami Valley Astronomical Society","og_description":"Telescope: Unitron 155 4\u201d f\/15 refractor, Atlas EQ-G Camera: Canon EOS Ra full frame DSLR Filter: 2\u201d GSO IR Cut Filter Guide scope: Orion 50mm Guidescope, ASI120MM, PHD, Dithered every 4 subs Exposure: 10x240sec, ISO 1600, saved as RAW Darks: Internal (Long Exposure Noise Reduction) Flats: 32×1\/10s sky flats taken at dusk Average Light Pollution: […]","og_url":"https:\/\/mvas.org\/?p=1555","og_site_name":"Miami Valley Astronomical Society","article_published_time":"2022-05-11T15:51:21+00:00","article_modified_time":"2022-05-11T15:51:22+00:00","og_image":[{"width":1024,"height":768,"url":"https:\/\/i0.wp.com\/mvas.org\/wp-content\/uploads\/2022\/05\/M51-5-7-2022-2j.jpg?fit=1024%2C768&ssl=1","type":"image\/jpeg"}],"author":"John Graham","twitter_card":"summary_large_image","twitter_misc":{"Written by":"John Graham","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/mvas.org\/?p=1555#article","isPartOf":{"@id":"https:\/\/mvas.org\/?p=1555"},"author":{"name":"John Graham","@id":"https:\/\/mvas.org\/#\/schema\/person\/4b76bddd1e4b80037c6412d592a6bcd6"},"headline":"M51 \u2013 The Whirlpool Galaxy in Canes Venatici","datePublished":"2022-05-11T15:51:21+00:00","dateModified":"2022-05-11T15:51:22+00:00","mainEntityOfPage":{"@id":"https:\/\/mvas.org\/?p=1555"},"wordCount":284,"commentCount":0,"image":{"@id":"https:\/\/mvas.org\/?p=1555#primaryimage"},"thumbnailUrl":"http:\/\/mvas.org\/mvas_wp\/wp-content\/uploads\/2022\/05\/M51-5-7-2022-2j.jpg","articleSection":["Beginner Imaging","Deepsky Imaging"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/mvas.org\/?p=1555#respond"]}]},{"@type":"WebPage","@id":"https:\/\/mvas.org\/?p=1555","url":"https:\/\/mvas.org\/?p=1555","name":"M51 \u2013 The Whirlpool Galaxy in Canes Venatici - Miami Valley Astronomical Society","isPartOf":{"@id":"https:\/\/mvas.org\/#website"},"primaryImageOfPage":{"@id":"https:\/\/mvas.org\/?p=1555#primaryimage"},"image":{"@id":"https:\/\/mvas.org\/?p=1555#primaryimage"},"thumbnailUrl":"http:\/\/mvas.org\/mvas_wp\/wp-content\/uploads\/2022\/05\/M51-5-7-2022-2j.jpg","datePublished":"2022-05-11T15:51:21+00:00","dateModified":"2022-05-11T15:51:22+00:00","author":{"@id":"https:\/\/mvas.org\/#\/schema\/person\/4b76bddd1e4b80037c6412d592a6bcd6"},"breadcrumb":{"@id":"https:\/\/mvas.org\/?p=1555#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/mvas.org\/?p=1555"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/mvas.org\/?p=1555#primaryimage","url":"http:\/\/mvas.org\/mvas_wp\/wp-content\/uploads\/2022\/05\/M51-5-7-2022-2j.jpg","contentUrl":"http:\/\/mvas.org\/mvas_wp\/wp-content\/uploads\/2022\/05\/M51-5-7-2022-2j.jpg"},{"@type":"BreadcrumbList","@id":"https:\/\/mvas.org\/?p=1555#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/mvas.org\/"},{"@type":"ListItem","position":2,"name":"M51 \u2013 The Whirlpool Galaxy in Canes Venatici"}]},{"@type":"WebSite","@id":"https:\/\/mvas.org\/#website","url":"https:\/\/mvas.org\/","name":"Miami Valley Astronomical Society","description":"The Universe Is Yours to Discover","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/mvas.org\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/mvas.org\/#\/schema\/person\/4b76bddd1e4b80037c6412d592a6bcd6","name":"John Graham","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/6594bdb62c6c4e3996ed828d3634de0cf766055de25500b0111229c5be714921?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/6594bdb62c6c4e3996ed828d3634de0cf766055de25500b0111229c5be714921?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/6594bdb62c6c4e3996ed828d3634de0cf766055de25500b0111229c5be714921?s=96&d=mm&r=g","caption":"John Graham"},"url":"https:\/\/mvas.org\/?author=3"}]}},"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/mvas.org\/index.php?rest_route=\/wp\/v2\/posts\/1555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mvas.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mvas.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mvas.org\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/mvas.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1555"}],"version-history":[{"count":1,"href":"https:\/\/mvas.org\/index.php?rest_route=\/wp\/v2\/posts\/1555\/revisions"}],"predecessor-version":[{"id":1557,"href":"https:\/\/mvas.org\/index.php?rest_route=\/wp\/v2\/posts\/1555\/revisions\/1557"}],"wp:attachment":[{"href":"https:\/\/mvas.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mvas.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mvas.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}