{"id":870,"date":"2020-10-14T18:05:45","date_gmt":"2020-10-14T22:05:45","guid":{"rendered":"https:\/\/blogs.haverford.edu\/astronoblog\/?p=870"},"modified":"2020-10-14T18:05:45","modified_gmt":"2020-10-14T22:05:45","slug":"multi-colorful-helix-nebula","status":"publish","type":"post","link":"https:\/\/blogs.haverford.edu\/astronoblog\/2020\/10\/14\/multi-colorful-helix-nebula\/","title":{"rendered":"Multi-colorful Helix Nebula"},"content":{"rendered":"<p>Continuing our series of images taken by students in &#8220;Advanced Observational Astrophysics&#8221; running Fall 2020, here are two color palettes showing off the beautiful Helix nebula, by Ross Silvers &#8217;22.<\/p>\n<figure id=\"attachment_871\" aria-describedby=\"caption-attachment-871\" style=\"width: 840px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.haverford.edu\/astronoblog\/files\/2020\/10\/Silvers_Helix_small.png\"><img decoding=\"async\" class=\"wp-image-871 size-large lazyload\" data-src=\"https:\/\/blogs.haverford.edu\/astronoblog\/files\/2020\/10\/Silvers_Helix_small-1024x517.png\" alt=\"\" width=\"840\" height=\"424\" data-srcset=\"https:\/\/blogs.haverford.edu\/astronoblog\/wp-content\/uploads\/sites\/2\/2020\/10\/Silvers_Helix_small-1024x517.png 1024w, https:\/\/blogs.haverford.edu\/astronoblog\/wp-content\/uploads\/sites\/2\/2020\/10\/Silvers_Helix_small-300x151.png 300w, https:\/\/blogs.haverford.edu\/astronoblog\/wp-content\/uploads\/sites\/2\/2020\/10\/Silvers_Helix_small-768x388.png 768w, https:\/\/blogs.haverford.edu\/astronoblog\/wp-content\/uploads\/sites\/2\/2020\/10\/Silvers_Helix_small.png 1278w\" data-sizes=\"(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 840px; --smush-placeholder-aspect-ratio: 840\/424;\" \/><\/a><figcaption id=\"caption-attachment-871\" class=\"wp-caption-text\">Helix Nebula in two colors, by Ross Silvers &#8217;22.<\/figcaption><\/figure>\n<p>Ross explains: &#8220;Pictured above is an image of the Helix Nebula (\u200bNGC 7293) created from a 16\u2019\u2019 telescope and CCD. We took eleven exposures at 120 seconds each for emission lines in each filter (\u200bH\u03b1, OIII, and SII)\u200b from ionized gas in the nebula. Emission spectroscopy allows us to read electromagnetic radiation from chemical elements in an astronomical object. In this case, we were able to compile the images and assign pigmentation to each emission filter to create a full color image. Classically, red, blue, and green colors are assigned to each layer, but I chose to create a different image, using magenta, yellow, and cyan. The first image shows \u200bH\u03b1 in magenta, oIII in cyan, and sII in yellow. The second image has H\u03b1 in yellow, oIII in cyan, and sII in magenta, for a slightly different composite image. Sometimes, the Helix Nebula is nicknamed \u201cThe Eye of Sauron\u201d as a reference to the Lord of the Rings addressing the eye-like shape of the nebula!&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Continuing our series of images taken by students in &#8220;Advanced Observational Astrophysics&#8221; running Fall 2020, here are two color palettes showing off the beautiful Helix nebula, by Ross Silvers &#8217;22. Ross explains: &#8220;Pictured above is an image of the Helix Nebula (\u200bNGC 7293) created from a 16\u2019\u2019 telescope and CCD. We took eleven exposures at &hellip; <a href=\"https:\/\/blogs.haverford.edu\/astronoblog\/2020\/10\/14\/multi-colorful-helix-nebula\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Multi-colorful Helix Nebula&#8221;<\/span><\/a><\/p>\n","protected":false},"author":25,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"wds_primary_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-870","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/posts\/870","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/comments?post=870"}],"version-history":[{"count":0,"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/posts\/870\/revisions"}],"wp:attachment":[{"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/media?parent=870"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/categories?post=870"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.haverford.edu\/astronoblog\/wp-json\/wp\/v2\/tags?post=870"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}