Foto: Hans Hilderfors. BL\u00c5S UPP BILDEN P\u00c5 DIN SK\u00c4RM F\u00d6R ATT SE DETALJER.<\/em><\/p>\n\n\n … att Sh2-174 \u00e4r en<\/strong> planetarisk nebulosa i n\u00e4rheten av polstj\u00e4rnan. Den \u00e4r ljussvag med endast 29,1 mag\/arcsec^2 enligt Stellarium.<\/p>\n\n\n\n … att Hans planering <\/strong>var att exponera en hel natt men lite ov\u00e4ntat gled dimmoln in fr\u00e5n \u00d6resund efter dryga tre timmars exponering och jag fick avbryta.<\/p>\n\n\n\n … att vid datorn <\/strong>lyckades Hans trots allt f\u00e5 fram nebulosan genom att g\u00f6ra Bin 2×2 via mjukvara (sl\u00e5r ihop 4 n\u00e4raliggande bildpixlar till en) s\u00e5 att SNR (signal to noise) blev acceptabelt om \u00e4n l\u00e5gt. Nebulosan \u00e4r relativt stor, cirka 20\u2019.<\/p>\n\n\n – Nebulosan f\u00e5r sin form genom att centralstj\u00e4rnan, en vit dv\u00e4rg, r\u00f6r sig med h\u00f6g hastighet mot h\u00f6ger i bilden och gasmassorna f\u00f6ljer med. I denna process kommer joniserat v\u00e4te p\u00e5 efterk\u00e4lken gentemot joniserat syre. I det bl\u00e5a joniserade syret ser man \u00e4ven ett bogv\u00e5gsfenomen, ber\u00e4ttar Hans.<\/p>\n\n\n\n – Bildf\u00e4lt 68′ x 51′ med 2,06″\/pixel.<\/p>\n\n\n\n – Fotograferad den 25 december fr\u00e5n Malm\u00f6 genom tv\u00e5 smalbandsfilter H\u03b1 och OIII, 10 x 600s vardera med min \u201dvanliga\u201d utrustning<\/p>\n\n\n\n Flitens lampa har inte lyst \u00f6ver sig imponerande i \u00e5r p\u00e5 W-bloggens redaktion, m\u00e5nga orsaker till det. Men 88 “nummer” har vi hunnit med, och alla i den astronomiska communityn \u00e4r \u00f6verf\u00f6rtjusta \u00f6ver att James Webb-teleskopet \u00e4ntligen kom i v\u00e4g. Teleskopet har redan passerat dubbla m\u00e5navst\u00e5ndet, vilket kan ses h\u00e4r.<\/a><\/p>\n\n\n\n N\u00e4r teleskopets first light noterats lovar bloggen hugga direkt!<\/p>\n\n\n\n Vi ses.<\/p>\n\n\n Ovanlig banger f\u00e5r runda av \u00e5ret Vi rundar av \u00e5ret – och \u00f6nskar Gott Nytt \u00c5r – med en sv\u00e5rf\u00e5ngad planetarisk nebulosa, dokumenterad f\u00f6r n\u00e5gra dagar sedan av Hans Hilderfors. Som ber\u00e4ttar… Foto: Hans Hilderfors. BL\u00c5S UPP BILDEN P\u00c5 DIN SK\u00c4RM F\u00d6R ATT SE DETALJER. … att Sh2-174 \u00e4r en planetarisk nebulosa i n\u00e4rheten av… L\u00e4s mer »Nr 88 2021<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/89375"}],"collection":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/comments?post=89375"}],"version-history":[{"count":6,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/89375\/revisions"}],"predecessor-version":[{"id":89386,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/89375\/revisions\/89386"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=89375"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=89375"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=89375"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2021\/12\/Sh2-174_Final-1-300x225.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2021\/12\/Sh2-174_Text-1-300x225.jpg\")
<\/a><\/p>\n\n\nGott Nytt \u00c5r med James Webb-teleskopet<\/h2>\n\n\n\n
![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2021\/12\/FULLCOLOR_2LINE_LIGHT_BG-e1634671604274-300x174-1.png\")
<\/a><\/p>","protected":false},"excerpt":{"rendered":"