{"id":8842,"date":"2009-04-07T22:36:33","date_gmt":"2009-04-07T22:36:33","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/m51-en-lrgb\/"},"modified":"2025-06-08T22:48:11","modified_gmt":"2025-06-08T20:48:11","slug":"m51-en-lrgb","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/m51-en-lrgb\/","title":{"rendered":"M51 en LRGB"},"content":{"rendered":"

Voici une composition de M51, sur base d\u2019images prises \u00e0 partir de mon jardin par une nuit sans lune:
\n\"\"<\/a><\/p>\n

Pour ceux qui n’aiment pas les artefacts de la d\u00e9convolution, voici:
\n\"\"<\/a><\/p>\n

19 & 20 mars-09
\nTemperature [\u00b0C]: +4 –> +0
\nWhirlpool\/M51 (NGC5194)
\nMagnitude:\t8.4
\nSize [ArcMin]:\t10.8×6.6<\/p>\n

Vixen\/Sphinx
\nTelevue\/NP101
\nF(mm)\/D(mm):\t540\/101=5.4
\nNo IR filter; nor Antipollution<\/p>\n

CCD\tStarlightXpress\tMX716
\nShip size [mm]:\t6.5×4.8
\nPixel array:\t752×580
\nPixel size [\u00b5m]:\t8,6×8,3
\nFOV [ArcMin]:\t39.9×53.6
\nFOV [ArcSec\/Pixel]:\t3.19<\/p>\n

Auto-guiding:\tOrion Starshot I + Maxim DL<\/p>\n

No dark
\nNo Flat
\nNo Bias
\nStack (V5)
\nL: 75x2min
\nR: 36x2min
\nG: 29x2min
\nB: 47x2min<\/p>\n

Treatment: Maxim DL
\nDeconvolution
\nCrop
\nColor balance
\nLevel
\nCurves
\nUnsharp<\/p>\n

2012-Feb-07 Traitement sous photoshop:
\n\"\"<\/a><\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

Voici une composition de M51, sur base d\u2019images prises \u00e0 partir de mon jardin par une nuit sans lune: Pour ceux qui n’aiment pas les artefacts de la d\u00e9convolution, voici: 19 & 20 mars-09 Temperature [\u00b0C]: +4 –> +0 Whirlpool\/M51 (NGC5194) Magnitude: 8.4 Size [ArcMin]: 10.8×6.6 Vixen\/Sphinx Televue\/NP101 F(mm)\/D(mm): 540\/101=5.4 No IR filter; nor Antipollution […]<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-8842","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=8842"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8842\/revisions"}],"predecessor-version":[{"id":12838,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8842\/revisions\/12838"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=8842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=8842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=8842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}