{"id":2137,"date":"2024-01-02T21:31:08","date_gmt":"2024-01-03T02:31:08","guid":{"rendered":"https:\/\/mvas.org\/mvas_wp\/?p=2137"},"modified":"2024-01-02T21:31:09","modified_gmt":"2024-01-03T02:31:09","slug":"m81-spiral-galaxy-in-ursa-major-3","status":"publish","type":"post","link":"https:\/\/mvas.org\/?p=2137","title":{"rendered":"M81 \u2013 Spiral Galaxy in Ursa Major"},"content":{"rendered":"\n
\"\"<\/a><\/figure>\n\n\n

Telescope: Unitron <\/span><\/span><\/span>5<\/span><\/span><\/span>10<\/span><\/span><\/span> 5<\/span><\/span><\/span>\u201d f\/1<\/span><\/span><\/span>6<\/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 Baader Fringe Killer (minus V)<\/p>\n

Guide scope: <\/span><\/span><\/span>Williams Optics<\/span><\/span><\/span><\/span> 50mm Guidescope, ASI<\/span><\/span><\/span><\/span>29<\/span><\/span><\/span><\/span>0MM, PHD<\/span><\/span><\/span><\/span><\/p>\n

Exposure: <\/span><\/span><\/span>4<\/span><\/span><\/span>7<\/span><\/span><\/span>x<\/span><\/span><\/span>6<\/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>64<\/span><\/span><\/span>x1\/<\/span><\/span><\/span><\/span>1<\/span><\/span><\/span><\/span>25<\/span><\/span><\/span><\/span>s <\/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<\/span><\/span><\/span><\/span> transparency<\/span><\/span><\/span><\/span><\/p>\n

Lensed Sky Quality Meter: 18.6 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

This is the last image in this image set taken with the Unitron 510.<\/p>\n

M81 is a beautiful spiral galaxy that is interacting with the nearby M82. The sky conditions for imaging this delicate galaxy were far from optimal, but it is still neat to see the beautiful sweeping arms sprinkled with star forming regions resulting from a close encounter with M82. Very pretty.<\/p>\n

M81 <\/span>is low in the northeast during the early evening and is high overhead after midnight.<\/span> <\/span><\/span><\/p>","protected":false},"excerpt":{"rendered":"

Telescope: Unitron 510 5\u201d f\/16 refractor, Atlas EQ-G Camera: Canon EOS Ra full frame DSLR Filter: 2\u201d Baader Fringe Killer (minus V) Guide scope: Williams Optics 50mm Guidescope, ASI290MM, PHD Exposure: 47x60sec, ISO 1600, saved as RAW Darks: Internal (Long Exposure Noise Reduction) Flats: 64×1\/125s sky flats taken at dusk Average Light Pollution: Bortle 8, […]<\/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":[15],"tags":[],"class_list":["post-2137","post","type-post","status-publish","format-standard","hentry","category-forums-deepsky-imaging","entry"],"yoast_head":"\nM81 \u2013 Spiral Galaxy in Ursa Major - 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=2137\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M81 \u2013 Spiral Galaxy in Ursa Major - 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