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Comet
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| Object : | Comet, Ison C/2012 S1 |
| Coordinates/Direction : | - |
| Object size : | - |
| Object magnitude : | - |
| More to know : |
You can read more about the comet on Seiichi Yoshida's homepage: http://www.aerith.net/ comet/ catalog/ 2012S1/ 2012S1.html |
(Click on image to get one in higher resolution, open in a new window)
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| Date : | 2013-10-19 |
| Time (UT) : | 03:38 to 03:51 |
| Mount : | SkyWatcher EQ6 Pro, Belt drive, beltdrive modified (DIY 2019) |
| Lens/telescope : | Pentax 500 mm f/4.5 (medium/35mm format lens) |
| Corrector/Barlow : | - |
| Field (FOV) : | 4.1x2.7o (full frame) before crop |
| camera : | Canon 5D Mk I, QE=0.25, full frame, 12 Mpixel, 12 bit |
| camera temperature: | About 3o C above surrounding temperature |
| Film/CCD : | Raw, Cr2 |
| Filter : | none |
| Exp. time : | 18x30 seconds at ISO1000 |
| Image process tool : | Fitswork, IrfanView. |
| Processing : | align rgb, dark, bias, median stack. |
| Site : | Sweden, Stockholm, Hagsätra.
Bortle 9 Free view Az: 20o to 90o, 165o to 185o, Alt: 20o to 55o |
| Comment : | Expectation about this comet was big, very bright and big, it failed. This is a crop around the comet. Almost invisible, it's the green dot in center. Even if it's weak you can clearly see the tail. The comet has this night a magnitude of 10, a couple of weeks later it peaked at magnitude -4 which is stronger than Hale Bopp. But I had clouds on the sky these days. On the full resolution image there is a bright object lower right, this the planet Mars. |
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| Date : | 2013-10-19 |
| Comment : | With all 38 images I had and aligned on the stars it look like this. This is a 800x800 1:1 crop around the comet. Siril which I used to stack couldn't handle comet stacking when it´'s weak like this comet. In this case AstroImageJ was better. |
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