{"id":82872,"date":"2020-01-24T12:41:11","date_gmt":"2020-01-24T11:41:11","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=82872"},"modified":"2020-01-27T11:56:45","modified_gmt":"2020-01-27T10:56:45","slug":"nr-7-2020","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2020\/01\/24\/nr-7-2020\/","title":{"rendered":"Nr 7 2020"},"content":{"rendered":"\n

Tio timmar f\u00f6r att fota “H\u00f6rluren”<\/h2>\n\n\n\n

Med full datakraft, optik och teleskopteknik har Hans Hilderfors<\/strong> gett sig p\u00e5 Jones \u2013 Emberson 1  aka  PK 164+31.1  aka  H\u00f6rlursnebulosan, en  ljussvag och sv\u00e5rf\u00e5ngad planetarisk nebulosa (PN).  Den ligger i stj\u00e4rnbilden Lodjuret p\u00e5 1600 ljus\u00e5rs avst\u00e5nd  fr\u00e5n oss. <\/p>\n\n\n\n

– Som de flesta PN \u00e4r det ett litet objekt med en vinkelstorlek p\u00e5 endast 6\u00b4.  P\u00e5 grund av detta samt dess l\u00e5ga ytljusstyrka \u00e4r den sv\u00e5rf\u00e5ngad fotografiskt och p\u00e5 gr\u00e4nsen f\u00f6r vad min utrustning i Malm\u00f6 klarar av. <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Foto: Hans Hilderfors<\/em><\/p>\n\n\n\n

– Den uppt\u00e4cktes 1939 p\u00e5 fotografiska pl\u00e5tar av Rebecca Jones <\/strong>och Richard Emberson<\/strong> vid Harvard College Observatory och namnet PK kommer fr\u00e5n de tjeckiska astronomerna Lubos Perek <\/strong>och Lubos Kohoutek <\/strong>som 1967 uppr\u00e4ttade en stor katalog \u00f6ver alla d\u00e5 k\u00e4nda PN i vintergatan.\u00a0
\u00a0
– PN bildas som bekant vid slutet av livsl\u00e4ngden f\u00f6r en stj\u00e4rna med liten massa, mindre \u00e4n 8 solmassor, \u00a0d\u00e5 dess yttre lager slungas ut i det interstell\u00e4ra rummet och resterna blir en liten dv\u00e4rg centralt bel\u00e4gen i den bildade PN. \u00a0PK 164 har som de flesta PN en cirkul\u00e4r form och dess centralstj\u00e4rna \u00e4r en bl\u00e5vit dv\u00e4rg med magnitud 16.8 \u00a0som ligger centralt och syns tydligt i bilden.\u00a0
\u00a0– Exponeringstiden f\u00f6r bilden \u00e4r sammanlagt drygt 10 timmar f\u00f6rdelat p\u00e5 tv\u00e5 kv\u00e4llar, 19\/1 samt 22\/1 i \u00e5r.\u00a0 RGB 72 x 0,5min vardera, H\u03b1 36 x 10min, OIII 30 x 5min. Bildstorlek 35\u00b4 x 27\u00b4.\u00a0<\/p>\n\n\n\n

Vill du bl\u00e5sa upp bilden p\u00e5 din sk\u00e4rm rekommenderas denna g\u00e5ng Hans inl\u00e4gg p\u00e5 astronet: <\/p>\n\n\n\n

http:\/\/astronet.se\/view_image.php?id=5999&mode=large<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n


 PS. <\/p>\n\n\n\n

Som den noggranne amat\u00f6rastronom Hans \u00e4r har han \u00e4ven identifierat ett antal galaxer i omr\u00e5det.
<\/p>\n\n\n\n

S\u00f6k tid p\u00e5 James Webb!<\/h2>\n\n\n\n

Alla fakta om hur det g\u00e5r till att ans\u00f6ka tid p\u00e5 kommande rymdbaserade James Webb-teleskopet finns nedan, ber\u00e4ttar Peter Linde<\/strong>:<\/p>\n\n\n\n

https:\/\/jwst-docs.stsci.edu\/jwst-opportunities-and-policies\/jwst-call-for-proposals-for-cycle-1<\/a><\/p>\n\n\n\n

Teleskoptiden l\u00e4r dock redan vara kraftigt \u00f6verbokad…<\/p>\n\n\n\n

Upps\u00e4ndning i slutet av mars 2021.<\/p>\n","protected":false},"excerpt":{"rendered":"

Tio timmar f\u00f6r att fota “H\u00f6rluren” Med full datakraft, optik och teleskopteknik har Hans Hilderfors gett sig p\u00e5 Jones \u2013 Emberson 1  aka  PK 164+31.1  aka  H\u00f6rlursnebulosan, en  ljussvag och sv\u00e5rf\u00e5ngad planetarisk nebulosa (PN).  Den ligger i stj\u00e4rnbilden Lodjuret p\u00e5 1600 ljus\u00e5rs avst\u00e5nd  fr\u00e5n oss. – Som de flesta PN \u00e4r det ett litet objekt… L\u00e4s mer »Nr 7 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\/82872"}],"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=82872"}],"version-history":[{"count":16,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/82872\/revisions"}],"predecessor-version":[{"id":82897,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/82872\/revisions\/82897"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=82872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=82872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=82872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}