{"id":1562,"date":"2022-05-15T13:21:40","date_gmt":"2022-05-15T17:21:40","guid":{"rendered":"http:\/\/mvas.org\/mvas_wp\/?p=1562"},"modified":"2022-05-15T13:21:40","modified_gmt":"2022-05-15T17:21:40","slug":"m20-the-trifid-nebula-in-sagittarius-4","status":"publish","type":"post","link":"https:\/\/mvas.org\/?p=1562","title":{"rendered":"M20 \u2013 The Trifid Nebula in Sagittarius"},"content":{"rendered":"\n
\"\"<\/a>
M20 \u2013 The Trifid Nebula in Sagittarius<\/figcaption><\/figure>\n\n\n

Telescope: Unitron 1<\/span><\/span><\/span>55<\/span><\/span><\/span> 4<\/span><\/span><\/span>\u201d f\/15 <\/span><\/span><\/span>refractor, <\/span><\/span><\/span>Atlas EQ-G<\/span><\/span><\/span><\/span><\/p>\n

Camera: Canon EOS Ra <\/span><\/span><\/span><\/span>full frame DSLR<\/span><\/span><\/span><\/span><\/p>\n

Filter: 2\u201d GSO IR Cut<\/span><\/span><\/span><\/span> Filter<\/span><\/span><\/span><\/span><\/p>\n

Guide scope: <\/span><\/span><\/span>Orion 50mm Guidescope, ASI120MM, PHD, Dithered every 4 subs<\/span><\/span><\/span><\/span><\/p>\n

Exposure: <\/span><\/span><\/span>23<\/span><\/span><\/span>x<\/span><\/span><\/span>1<\/span><\/span><\/span>2<\/span><\/span><\/span>0<\/span><\/span><\/span>sec, <\/span><\/span><\/span>ISO<\/span><\/span><\/span> 16<\/span><\/span><\/span><\/span>00<\/span><\/span><\/span><\/span>, saved as <\/span><\/span><\/span>RAW<\/span><\/span><\/span><\/p>\n

Darks: Internal (Long Exposure Noise Reduction)<\/span><\/p>\n

Flats: <\/span><\/span><\/span>32×1\/<\/span><\/span><\/span><\/span>1<\/span><\/span><\/span><\/span>0s <\/span><\/span><\/span><\/span>sky<\/span><\/span><\/span><\/span> flats taken at dusk<\/span><\/span><\/span><\/span><\/p>\n

Average Light Pollution: Bortle 8, <\/span><\/span><\/span><\/span>fai<\/span><\/span><\/span><\/span>r transparency, <\/span><\/span><\/span><\/span>low altitude<\/span><\/span><\/span><\/span><\/p>\n

Lensed Sky Quality Meter: 18.4 mag\/arc-sec^2<\/p>\n

Stacking: Mean with a 1-sigma clip<\/p>\n

White Balance: Nebulosity Automatic<\/p>\n

Software: Backyard EOS, Deepsky Stacker<\/span>, Nebulosity, Photoshop<\/span><\/p>\n

M20, the Trifid Nebula in Sagittarius is one of a series of nebula that grace the summer Milky Way. The red is a tenuous cloud of interstellar hydrogen set aglow by stars embedded in it, the blue is dust in the background reflecting starlight, and the dark lanes are vast streamers of dust in the foreground. Being near the Milky Way this field is crowded with faint stars, though the density of stars is uneven. The dark regions show areas of dust blocking the light from the faint distant stars in the background while the brighter regions are relatively clear avenues into the deep galaxy beyond.<\/span><\/span><\/span><\/p>\n

M20<\/span><\/span><\/span><\/span> is <\/span><\/span><\/span><\/span>currently <\/span><\/span><\/span><\/span>a morning object, rising late in the evening and over the southern horizon near dawn<\/span><\/span><\/span><\/span>.<\/span><\/span><\/span><\/span><\/p>","protected":false},"excerpt":{"rendered":"

Telescope: Unitron 155 4\u201d f\/15 refractor, Atlas EQ-G Camera: Canon EOS Ra full frame DSLR Filter: 2\u201d GSO IR Cut Filter Guide scope: Orion 50mm Guidescope, ASI120MM, PHD, Dithered every 4 subs Exposure: 23x120sec, ISO 1600, saved as RAW Darks: Internal (Long Exposure Noise Reduction) Flats: 32×1\/10s sky flats taken at dusk Average Light Pollution: […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","pgc_sgb_lightbox_settings":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[14,15],"tags":[],"class_list":["post-1562","post","type-post","status-publish","format-standard","hentry","category-forums-beginner-imaging","category-forums-deepsky-imaging","entry"],"yoast_head":"\nM20 \u2013 The Trifid Nebula in Sagittarius - Miami Valley Astronomical Society<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mvas.org\/?p=1562\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M20 \u2013 The Trifid Nebula in Sagittarius - 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