NGC7293 - Helix Nebula : 無料・フリー素材/写真
NGC7293 - Helix Nebula / 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: NGC7293 -- Helix NebulaImage FOV: 3 degrees (180 min) by 2.25 degrees (135 min) Image Scale: 10 arc-second/pixelDate: 2008/10/03Exposure: 15 x 10 minutes = 2h30m total exposure, ISO800, f/4.8 Filter: IDAS LPS 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 5-second guide exposures Processing: Raw conversion and calibration with ImagesPlus (dark frames, bias frames, and flat frames); Aligning and combing with Registar; Levels adjustment, cropping/resizing, JPEG conversion with Photoshop CS. No sharpening or noise reduction.Remarks: Temperature at start 36F; SQM-L reading 21.22 at start, 21.27 in middle (crescent moonset). |
| 撮影日 | 2008-10-03 00:00:00 |
| 撮影者 | s58y |
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