H\u00e4rom kv\u00e4llen l\u00e5g sm\u00e5planeten Vesta n\u00e4ra “Krabban” p\u00e5 himlavalvet. Bengt R\u00f6ndes dokumentation blev denna:<\/p>\n
Fotot togs 12 januari, dagen efter l\u00e5g Vesta bara en halv grad fr\u00e5n M1.<\/p>\n – Bara 15 min total exponeringstid med min vanliga \u201df\u00e5gelkamera\u201d, Canon R5 med 500 mm objektiv.<\/p>\n Det ljusa stj\u00e4rnan till v\u00e4nster om Vesta \u00e4r Tianguan, zeta Tau.\u00a0 Vesta har just nu magn 6,6.<\/p>\n Hans Hilderfors har gjort en sp\u00e4nnande animation (se nedan) och j\u00e4mf\u00f6rt Krabban 2018 med 2024. Optik \u00e4r i b\u00e5da fallen samma, en refraktor med \u00f6ppning 13 cm och f4,5.<\/p>\n – Min kamera dock utbytt och anv\u00e4nd mjukvara f\u00f6rb\u00e4ttrad vilket syns p\u00e5 slutresultatet. Krabbnebulosan \u00e4r relativt liten med m\u00e5tten 420 x 290 b\u00e5gsekunder.<\/p>\n – Den expanderar allt sedan f\u00f6delsen i en supernovaexplosion \u00e5r 1054. Hastigheten p\u00e5 expansionen \u00e4r f\u00f6r n\u00e4rvarande cirka 1500 km\/s vilket blir cirka 0,15 b\u00e5gsekunder per \u00e5r sett fr\u00e5n jorden. Jag tycker mig kunna ana expansionen vid granskning av animationen. B\u00e5da bilderna \u00e4r noggrant likst\u00e4llda med 0,656 b\u00e5gsekunder\/pixel i uppl\u00f6sning och rotation -0,89\u00b0 (s\u00e5ledes norr upp\u00e5t).<\/p>\n Stj\u00e4rnan upp\u00e5t mot h\u00f6ger som har en tydlig egenr\u00f6relse ner\u00e5t \u00e4r TYC 1309-1640-1. Den uppges flytta sig cirka 0,25 b\u00e5gsek\/\u00e5r.<\/p>\n Bilderna \u00e4r tagna genom smalbandsfilter H\u03b1 och OIII. Exponering totalt 2 timmar 2018 och 5 timmar 2024.<\/p>\n (Bildtips: Klicka\/dubbelklicka p\u00e5 bilden s\u00e5 kan du se vad som h\u00e4nt. W-bloggens anm.)<\/p>\n Allt ljus p\u00e5 Krabbnebulosan Tack till v\u00e5ra f\u00f6rn\u00e4mliga ASTB-astrofotografer Bengt R\u00f6nde och Hans Hilderfors, som senaste dagar riktat sin optik mot ikoniska M1, Krabbnebulosan – ett himlaobjekt vi k\u00e4nner speciellt f\u00f6r h\u00e4r p\u00e5 W-bloggen eftersom v\u00e5r guru Knut Lundmark 1938 var en av de f\u00f6rsta (j\u00e4mte N U Mayall) under sitt uppeh\u00e5ll p\u00e5 Lick Observatory… L\u00e4s mer »Nr 2 2024<\/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":"off","neve_meta_content_width":70,"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\/94844"}],"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=94844"}],"version-history":[{"count":9,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/94844\/revisions"}],"predecessor-version":[{"id":94854,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/94844\/revisions\/94854"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=94844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=94844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=94844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2024\/01\/VestaOchM1_20240112_60x15_ISO1600-med-text-1-1-1024x801.jpg\")
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