NGC6888 -- H-alpha : 無料・フリー素材/写真
NGC6888 -- H-alpha / s58y
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Subject: NGC6888 -- Crescent Nebula, and parts of IC1318Image FOV = 3 degrees 20 min (200 min) by 2 degrees 18 min (138 min/2.3 degrees) Image Scale = 10 arc-second/pixelDate: 2008/07/05Location: near Halcottsville, NY Exposure: 14 x 10 minutes = 2h20m total exposure, ISO800, f/4.8 Filter: Baader 7nm H-alpha filter Camera: Hutech-modified Canon 30DTelescope: SV80S 80mm f/6 + TV TRF-2008 0.8X reducer/flattener = 384mm FL, f/4.8Mount: Astro-Physics AP900 Guiding: ST-402 autoguider and SV66 guidescope. MaximDL autoguiding software using 6-second guide exposures Processing: Raw conversion and calibration with ImagesPlus (dark frames, bias frames, and flat frames); Aligning and combing with Registar; Gray conversion, levels, curves, cropping/resizing, JPEG conversion with Photoshop CS. No sharpening or noise reduction.Remarks: Temperature at end: 57F; SQM-L reading 21.45 at start, 21.51 in middle. A small part of IC1318 (part of Gamma Cygnii nebulosity) is visible at the lower left. |
| 撮影日 | 2008-07-30 20:57:38 |
| 撮影者 | s58y |
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