{"id":264,"date":"2016-07-08T02:57:50","date_gmt":"2016-07-08T08:57:50","guid":{"rendered":"http:\/\/13thstone.com\/blog\/?p=264"},"modified":"2016-07-08T02:57:50","modified_gmt":"2016-07-08T08:57:50","slug":"ngc-6888-in-bi-color","status":"publish","type":"post","link":"https:\/\/13thstone.com\/blog\/?p=264","title":{"rendered":"NGC 6888 in bi-color"},"content":{"rendered":"
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The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.<\/span><\/span><\/div>\n<\/div>\n
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The light sub-frames were acquired over the last two nights (7\/6-7) and represents just under 2 hours of Hydrogen-alpha and 4 hours of Oxygen-III narrowband data. It is the first image that I have successfully created with 10 minute subs (600 sec) and also the first light on my new field flattener. I believe the reason I was able to pull off longer subframes has entirely to do with balance on the mount – autoguider and OTA parallel and centered over frame versus the dual-saddle side-by-side configuration I end up having to use when I use camera lenses. This is my first attempt at the Crescent and despite some bleary-eyed, late-night, rushed bi-color processing, I think it turned out alright. Practice helps. <\/span><\/span><\/div>\n<\/div>\n
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\"NGC6888<\/a>
<\/span> NGC6888 – The Crescent Nebula<\/span><\/figcaption><\/figure>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by Friedrich Wilhelm Herschel in 1792. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing … Continue reading NGC 6888 in bi-color<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-264","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4P0Vj-4g","_links":{"self":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/264","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=264"}],"version-history":[{"count":1,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/264\/revisions"}],"predecessor-version":[{"id":266,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/264\/revisions\/266"}],"wp:attachment":[{"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=264"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/13thstone.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}