– Den har en modern cmos sensor i s\u00e5 kallat fullformat p\u00e5 24 x 35 mm. Uppl\u00f6sningen \u00e4r p\u00e5 hela 62 miljoner pixlar, 9600 x 6400. Ljusk\u00e4nsligheten \u00e4r uppe mot 90% i visuella omr\u00e5det.<\/p>\n\n\n\n
– Bifogad bild \u00e4r tagen med klarfilter fr\u00e5n ljusf\u00f6roreningarna i Malm\u00f6 mot dubbelstj\u00e4rnan Albireo i Svanen, rakt in mot vintergatan. Ett stort antal stj\u00e4rnor framtr\u00e4der trots exponering p\u00e5 endast 4 x 1 minut. Detaljbilden exponerad endast 3 sekunder. Bildf\u00e4ltet \u00e4r 3,48\u00b0 x 2,32\u00b0.
– Sensorn \u00e4r kr\u00e4vande dels f\u00f6r optiken som m\u00e5ste teckna skarpt \u00e4ven ut mot kanterna och \u00e4ven datorn som anv\u00e4ndes f\u00f6r bildbehandling. Bildfilerna ut fr\u00e5n kameran \u00e4r stora, 120 MB per bild.<\/p>\n\n\n
Njae, hur pass unika \u00e4r g\u00f6teborgarna (scrolla ner till f\u00f6rra inl\u00e4gget). Jesper Sollerman<\/strong>, SU, efterlyser rentav “ett unders\u00f6kande gr\u00e4v f\u00f6r att rota reda i de astronomihistoriska kursernas historia. Orienteringskursernas ursprung debatterades ju p\u00e5 v\u00e5r 100-blogg”. – Stockholmskursen k\u00e4nde jag inte till, kul att den finns!<\/p>\n\n\n\n En bok som tidigt f\u00f6rekom i Stockholm var Ulf Sinnerstads<\/strong> bok, som jag gladde honom med att recensera i Kv\u00e4llsposten<\/em> – en sk\u00e5nsk kv\u00e4llstidning. Han m\u00e5ste ha st\u00e4llt sig en och annan fr\u00e5ga om den svenska pressen. Faktab\u00f6cker p\u00e5 den tiden (mitten 80-talet) s\u00e5gs som kontraband p\u00e5 de flesta kultursidor och anm\u00e4ldes aldrig. KvP var det stora undantaget!<\/p>\n\n\n Kursboken i dag i Stockholm \u00e4r denna:<\/p>\n\n\n Ett gr\u00e4v, som Jesper efterlyser, k\u00e4nns som en utmaning. Vi f\u00e5r se var vi landar. Lunds f\u00f6rflutna g\u00e5r i vart fall inte att f\u00f6rneka, Lundmark inledde ju rentav en astronomihistorisk publikationsserie. Den h\u00f6ll dock inte ut s\u00e4rskilt l\u00e4nge och n\u00e5gra egentliga kurser tror jag inte Lundmark gav f\u00f6r studenterna.<\/p>\n\n\n En virtuellt bedriven konferens i somras, har nu resulterat i denna rapport<\/a> fr\u00e5n USA om problemen med alla l\u00e5gtlygande satellitarmador och hur de p\u00e5verkar den astronomiska forskningen:<\/p>\n\n\n N\u00e5gra av rekommendationerna (jag \u00e5terger dem p\u00e5 engelska, det klarar vi):<\/p>\n\n\n\n * Launch fewer or no LEOsats. However impractical or unlikely, this is the only option identified that can achieve zero astronomical impact. N\u00e4rbilden av Albireo bara ett “test”… Hans Hilderfors gjorde h\u00e4rom kv\u00e4llen sitt f\u00f6rsta m\u00f6rkertest med sin nya monokamera. Resultatet kan bara sammanfattas som – str\u00e5lande. – Den har en modern cmos sensor i s\u00e5 kallat fullformat p\u00e5 24 x 35 mm. Uppl\u00f6sningen \u00e4r p\u00e5 hela 62 miljoner pixlar, 9600 x 6400. Ljusk\u00e4nsligheten \u00e4r uppe mot… L\u00e4s mer »Nr 77 2020<\/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\/85403"}],"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=85403"}],"version-history":[{"count":19,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/85403\/revisions"}],"predecessor-version":[{"id":85437,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/85403\/revisions\/85437"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=85403"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=85403"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=85403"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/Albireo-testbild-lagre-antal-pixlar-300x200.jpg\")
<\/a><\/p>\n\n\n
Tips: Bl\u00e5s upp bilden ordentligt f\u00f6r att se alla stj\u00e4rnorna !!!
Optik: Refraktor 130 mm f\/4,5.
Kamera: ZWO 6200 mm
Exponering: 4 x 1 minut (detaljbild 3 sekunder enkel)
Hans instrumentering just nu:
<\/p>\n\n\n![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/Instrument-1-300x225.jpg\")
<\/a><\/p>\n\n\nAstronomihistoria \u00e4ven i Kungl Hufvudkommuen<\/h2>\n\n\n\n
Och Gustav Holmberg<\/strong> erk\u00e4nner f\u00f6r sin del:<\/p>\n\n\n\n![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/5bf6cc7f5da491-242x300.jpg\")
<\/a><\/p>\n\n\n![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/OIP1.jpg\")
<\/a><\/p>\n\n\n![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/predictionxlongitude1-300x170.jpg\")
<\/a><\/p>\n\n\nF\u00f6rsta tunga rapporten om Musks satelliter<\/h2>\n\n\n\n
![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/SATCON1_Report_Cover_Small1-233x300.png\")
<\/a><\/p>\n\n\n
* Deploy satellites at orbital altitudes no higher than ~600 km.
* Darken satellites or use sunshades to shadow their reflective surfaces.
* Control each satellite’s orientation in space to reflect less sunlight to Earth.
* Minimize or eventually be able to eliminate the effect of satellite trails during the processing of astronomical images.
* Make more accurate orbital information available for satellites so that observers can avoid pointing telescopes at them<\/p>\n","protected":false},"excerpt":{"rendered":"