{"id":33668,"date":"2022-07-20T00:00:00","date_gmt":"2022-07-20T00:00:00","guid":{"rendered":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/?post_type=purple_issue&#038;p=33668"},"modified":"2022-07-21T14:14:16","modified_gmt":"2022-07-21T14:14:16","slug":"star-of-the-month-11","status":"publish","type":"post","link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/2022\/07\/20\/star-of-the-month-11\/","title":{"rendered":"Star of the month"},"content":{"rendered":"\n<p class=\"has-text-align-center\"><strong>Sadr, on the edge of the Cygnus Rift <\/strong><\/p>\n\n<figure class=\"no-tts wp-block-image article-in-image bild\"><img loading=\"lazy\" width=\"1035\" height=\"721\" src=\"https:\/\/dj9jqhxgw9833.cloudfront.net\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629.jpg\" alt=\"\" class=\"no-tts wp-image-33667\" srcset=\"https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629.jpg 1035w, https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-300x209.jpg 300w, https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-1024x713.jpg 1024w, https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-768x535.jpg 768w\" sizes=\"(max-width: 1035px) 100vw, 1035px\" \/><figcaption>The centre of Cygnus\u2019s cross is an interesting region, with the bright open cluster M29 visible <\/figcaption><\/figure>\n\n<p class=\"article-full-body sans-serif\">Sadr (Gamma (\u03b3) Cygni) is really easy to identify as it sits at the heart of the large summer asterism known as the Northern Cross, the core portion of Cygnus, the Swan. <\/p>\n\n<p class=\"article-full-body sans-serif\">The name is pronounced \u2018sadder\u2019 and means \u2018chest\u2019, a reference to where it sits within the Swan. Despite the gamma label, at mag. +2.2, Sadr is the second-brightest star in Cygnus after mag. +1.3<span> Deneb (Alpha (\u03b1) Cygni).<\/span><\/p>\n\n<p class=\"article-full-body sans-serif\">Sadr is a popular target for summer observing as it sits within a bright portion of the Milky Way, on the edge of a dark region known as the Cygnus Rift, where the Milky Way appears to split in two. <\/p>\n\n<p class=\"article-full-body sans-serif\">The apparent split is caused by a dark dust cloud between us and the myriad stars in the disc of the Milky Way. Sadr itself is also affected by the dust: it dims the star\u2019s light by around half a magnitude. <\/p>\n\n<p class=\"article-full-body sans-serif\">Sadr is a supergiant with a spectral classification of F8<span> Iab. This puts it in the yellow white category, more towards the yellow end, while \u2018Iab\u2019 indicates it\u2019s an intermediate size luminous supergiant. For nearly 80 years, Sadr\u2019s spectrum has been used as a stable reference point to classify other stars against.<\/span><\/p>\n\n<p class=\"article-full-body sans-serif\">Physically, Sadr is 150 times larger than our Sun, contains 12 times as much mass and is emitting 33,000 times more energy. Consequently, Sadr is thought to be fairly young, at around 12 million years old. It\u2019s estimated to lie around 1,800 lightyears from the Sun. <\/p>\n\n<p class=\"article-full-body sans-serif\">The region around Sadr contains IC 1318, a complex<span> diffuse nebula emitting strongly at hydrogen alpha wavelengths. As a result, the region is popular for long exposure photographs, with Sadr at the centre.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sadr, on the edge of the Cygnus Rift <\/p>\n","protected":false},"author":24,"featured_media":33667,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ub_ctt_via":"","purple_page_number":"53","purple_custom_meta_purple_page_number":"53","purple_seq_number":"2","purple_custom_meta_purple_seq_number":"2","purple_source_article":"article_53-2.xml","purple_custom_meta_purple_source_article":"article_53-2.xml","purple_source_issue":"August-2022","purple_custom_meta_purple_source_issue":"August-2022","purple_external_id":"August-2022-53-2","purple_custom_meta_purple_external_id":"August-2022-53-2","purple_issue_code":"|0000086555||","purple_custom_meta_purple_issue_code":"|0000086555||","purple_android_product":"com.im.skyatnight.207","purple_custom_meta_purple_android_product":"com.im.skyatnight.207","purple_ios_product":"com.im.skyatnight.207","purple_custom_meta_purple_ios_product":"com.im.skyatnight.207","purple_web_product":"","purple_custom_meta_purple_web_product":"","purple_publication_id":"075fab74-0a21-4201-866a-899d6c41c40c","purple_migrated":"","kt_blocks_editor_width":""},"categories":[22],"tags":[14],"featured_image_src":"https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629.jpg","author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"acf":{"readingTimeMinutes":"2","apple_news_title":""},"uagb_featured_image_src":{"full":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629.jpg",1035,721,false],"thumbnail":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-150x150.jpg",150,150,true],"medium":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-300x209.jpg",300,209,true],"medium_large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-768x535.jpg",768,535,true],"large":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629-1024x713.jpg",800,557,true],"1536x1536":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629.jpg",1035,721,false],"2048x2048":["https:\/\/c01.purpledshub.com\/uploads\/sites\/77\/2022\/07\/78482594-9b39-4ec3-88e1-3d020d802629.jpg",1035,721,false]},"uagb_author_info":{"display_name":"importmanagerhub@sprylab.com","author_link":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/author\/importmanagerhubsprylab-com\/"},"uagb_comment_info":0,"uagb_excerpt":"Sadr, on the edge of the Cygnus Rift","_links":{"self":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts\/33668"}],"collection":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/users\/24"}],"replies":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/comments?post=33668"}],"version-history":[{"count":3,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts\/33668\/revisions"}],"predecessor-version":[{"id":34221,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/posts\/33668\/revisions\/34221"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media\/33667"}],"wp:attachment":[{"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/media?parent=33668"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/categories?post=33668"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/c01.purpledshub.com\/bbcskyatnight\/wp-json\/wp\/v2\/tags?post=33668"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}