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M 101 (NGC 5457), in Ursa Major
| Date | 2004-07-11 |
| Scope |
Astro-Physics 130 EDF at f6.0 on A-P 1200GTO mount; ST-4 guiding via separate guidescope SBIG ST-10XME CCD camera with CFW-8 color wheel controlled with MaxIm DL/CCD v4.01 |
| Exposures | L=26x300 sec, R=6x300 sec, G=6x300 sec, B=6x300 sec, all unbinned |
| Processing |
Calibrated and gradients removed MaxIm. Blooms removed with Wodaski's Debloomer. RGB assembled in MaxIm. Luminance and RGB registered with RegiStar. L and RGB combined in Photoshop and then separately stretched and unsharp masked or blurred. Finally flattened and converted to jpg. |
Here is an older image:
M101 is a large Milky-Way-like galaxy in Ursa Major, about 25 million light-years (ly) distant. It is estimated to be 190,000 ly in diameter and to exceed the brightness of the Milky Way by about 2.5-fold. It was discovered in 1781. This image was captured over two nights with a bright 40+% moon shining.
| Date | 2002-04-21, 22 |
| Scope |
Astro-Physics 130 EDF at f4.5 on A-P 1200GTO mount; ST-4 guiding Meade 416XTE CCD camera with 616 color wheel controlled with MaxIm DL/CCD v3.05 |
| Exposures | L=15x300 sec, R=8x300 sec, G=8x300 sec, B=8x300 sec, all unbinned |
| Processing |
Calibrated and RGB assembled in MaxIm. Luminance enhanced with DDP in MaxIm. L and RGB combined in Photoshop and then separately stretched and unsharp masked or blurred. Finally flattened and converted to jpg. |