{"id":2230,"date":"2025-05-23T19:05:56","date_gmt":"2025-05-24T01:05:56","guid":{"rendered":"https:\/\/albersheim.com\/wordpress\/?post_type=blog_post&p=2230"},"modified":"2025-05-27T22:34:35","modified_gmt":"2025-05-28T04:34:35","slug":"sadr-region-in-tight-vs-wide-field","status":"publish","type":"blog_post","link":"https:\/\/albersheim.com\/wordpress\/blog-post\/sadr-region-in-tight-vs-wide-field\/","title":{"rendered":"Sadr Region: in tight vs wide field"},"content":{"rendered":"\n
\"Crescent
Crescent Nebula<\/figcaption><\/figure>\n\n\n\n
\"Crescent
Crescent and Butterfly \nNebulae, Widefield 135mm<\/figcaption><\/figure>\n\n\n\n


My wife asked me why I include all this technical goobage, and I told her it as included for all the other astrophotographers and amateur astronomers out there. So, she replied \u201cyou mean all 5 of them!\u201d Anyway, here it comes:<\/p>\n\n\n\n

The Sadr Region (also known as IC 1318 or the Gamma Cygni Nebula) is the diffuse<\/p>\n\n\n\n

emission nebula surrounding the star  Sadr at the center of constellation Cygnus’s cross. This region is one of several surrounding nebulous regions, including the Butterfly Nebula and the Crescent Nebula.<\/p>\n\n\n\n

The Crescent Nebula (also known as NGC 6888 or Sharpless 105), located near the center of both images, is an emission nebula that is about 5000 light-years (29,400 billion miles) away from Earth. It is formed by the fast stellar wind from the Wolf-Rayet WR 136 colliding with and energizing the slower moving wind ejected by the star when it became a red giant  a out 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.<\/p>\n\n\n\n

The image on the top was taken using a telescope in a Bortle 2 area back in March, with a focal length of 448mm. The lower image was taken in a Bortle 6 area using the same Astro-dedicated camera, connected to a lens with a 135mm focal length. The wider field of view reveals the Butterfly nebula in the lower left. Sadr is the bright star located just above the Butterfly.<\/p>\n\n\n\n

The top image is comprised of 20 stacked subs @ 600s (200m or 3.3 hrs) and was calibrated using 60 dark frames, 60 bias frames, and 60 flat images. It was stacked using the python script Sirilic and was post-processed with Siril and Photoshop.<\/p>\n\n\n\n

The lower image is comprised of 18 @ 300s,  20 @ 180s, and 30 @ 60s (180m or 3 hrs) and was calibrated using 60 dark frames, 60 bias frames, and 60 flat frames. It was stacked using the Siril, in Ha and O3, and post-processed with Siril, GIMP, and Photoshop.<\/p>\n\n\n\n

Equipment:<\/p>\n\n\n\n

\u2022 Telescope: SVBony SV503 80ED 560mm, F\/7 Refractor with a 0.8 Reducer\/Flattener (Top image, reduced focal length 448mm)<\/p>\n\n\n\n

\u2022 Lens: (Lower image) Rokinon 135mm f\/2 (I used f\/2.8)<\/p>\n\n\n\n

\u2022 Mount: SkyWatcher HEQ5 Pro<\/p>\n\n\n\n

\u2022 Camera: ZWO ASI2600 MC Pro with 100 gain<\/p>\n\n\n\n

\u2022 Filter: Optlong L-enHance for lower image<\/p>\n\n\n\n

\u2022 Guiding: ZWO ASI120mm Mini Monochrome Guide Camera with the ZWO 30mm f\/4 Guide Scope<\/p>\n\n\n\n

\u2022 Automation: ZWO ASIAir Mini<\/p>\n","protected":false},"excerpt":{"rendered":"

My wife asked me why I include all this technical goobage, and I told her it as included for all the other<\/p>\n

Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"tags":[],"blog-category":[],"class_list":["post-2230","blog_post","type-blog_post","status-publish","hentry"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/blog_post\/2230","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/blog_post"}],"about":[{"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/types\/blog_post"}],"author":[{"embeddable":true,"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/comments?post=2230"}],"wp:attachment":[{"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/media?parent=2230"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/tags?post=2230"},{"taxonomy":"blog-category","embeddable":true,"href":"https:\/\/albersheim.com\/wordpress\/wp-json\/wp\/v2\/blog-category?post=2230"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}