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ASTRO: Cocoon Galaxy NGC 4490 and NGC 4485
Did not see my posting, so here's another try..
Seeing was not to bad last night, transparicy still not so good.. 36 x 90 sec. Dark corrected. 10"SCT Homebuild CCD camera. Some MAXIMDL CS2 Strange looking galaxy, a bit of a mess.. Thx for looking Dirk |
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ASTRO: Cocoon Galaxy NGC 4490 and NGC 4485
D van den H wrote: Did not see my posting, so here's another try.. Seeing was not to bad last night, transparicy still not so good.. 36 x 90 sec. Dark corrected. 10"SCT Homebuild CCD camera. Some MAXIMDL CS2 Strange looking galaxy, a bit of a mess.. Thx for looking Dirk ------------------------------------------------------------------------ Both made it to my server. Usenet amazes me sometimes. A post won't hit your own server but show up on the other side of the world just fine. That's another one on my to-do list. Looks like yet another clear night and a third night of a dead computer power supply. They have one coming at least. I can't even process as all my images are on that computer and now the supply is totally deceased. What chip do you have in your camera? Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: Cocoon Galaxy NGC 4490 and NGC 4485
Rick,
This is the spec of the CCD chip: CCD type: Sony ICX083AL SuperHAD CCD with ultra low dark current and vertical anti-blooming. CCD pixel data: Pixel size: 11.6 x 11.2uM, image format 752 x 580 pixels (High Res. mode), or 23.2 x 22.4uM. CCD size: Imaging area: 8.7mm (horizontal) x 6.5mm (vertical). Spectral response: Peak response at 520nM (Green), 50% at 400nM (Violet) and 670nM (Near infra-red). Quantum efficiency: Approx. 65% peak at 520nM. Readout noise: Less than15 electrons RMS. Full-well capacity: Greater than 300,000 e-. Anti-blooming: Overload margin greater than 800x Dark current: Dark frame saturation time greater than 100 hours. Less than 0.1 electrons/ second at +10C ambient. Data format: Full 16 bits. So far i enjoy using this chip, Originally they come from a Sony broadcast camera where they are mounted on a optical block one for each color (3 in a block). I have a couple of these block here... perhaps build a super CCD head for the three colors.. reg Dirk "Rick Johnson" wrote in message ... D van den H wrote: Did not see my posting, so here's another try.. Seeing was not to bad last night, transparicy still not so good.. 36 x 90 sec. Dark corrected. 10"SCT Homebuild CCD camera. Some MAXIMDL CS2 Strange looking galaxy, a bit of a mess.. Thx for looking Dirk ------------------------------------------------------------------------ Both made it to my server. Usenet amazes me sometimes. A post won't hit your own server but show up on the other side of the world just fine. That's another one on my to-do list. Looks like yet another clear night and a third night of a dead computer power supply. They have one coming at least. I can't even process as all my images are on that computer and now the supply is totally deceased. What chip do you have in your camera? Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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ASTRO: Cocoon Galaxy NGC 4490 and NGC 4485
Thanks. The images looked like those from a Sony chip but the ones
Starlight Xpress uses in that 752x580 range are a bit over 8 micron in size. That didn't seem to match your image scale. Now it makes sense. Nice deep wells help a lot and good response curve is nice when moving into color. It should work pretty well for longer exposures. When I started with the 6" f/4 a couple weeks short of a year ago now. I could go 5 minutes without guiding. At F/4 that's plenty long! It goes deeper for galaxies than the 14" does using 10 minute sub frames binned 2x2 (equivalent to f/5). The longer focal length gives a lot more detail however. Seems no matter what you do in life it's all a compromise! Rick D van den H wrote: Rick, This is the spec of the CCD chip: CCD type: Sony ICX083AL SuperHAD CCD with ultra low dark current and vertical anti-blooming. CCD pixel data: Pixel size: 11.6 x 11.2uM, image format 752 x 580 pixels (High Res. mode), or 23.2 x 22.4uM. CCD size: Imaging area: 8.7mm (horizontal) x 6.5mm (vertical). Spectral response: Peak response at 520nM (Green), 50% at 400nM (Violet) and 670nM (Near infra-red). Quantum efficiency: Approx. 65% peak at 520nM. Readout noise: Less than15 electrons RMS. Full-well capacity: Greater than 300,000 e-. Anti-blooming: Overload margin greater than 800x Dark current: Dark frame saturation time greater than 100 hours. Less than 0.1 electrons/ second at +10C ambient. Data format: Full 16 bits. So far i enjoy using this chip, Originally they come from a Sony broadcast camera where they are mounted on a optical block one for each color (3 in a block). I have a couple of these block here... perhaps build a super CCD head for the three colors.. reg Dirk "Rick Johnson" wrote in message ... D van den H wrote: Did not see my posting, so here's another try.. Seeing was not to bad last night, transparicy still not so good.. 36 x 90 sec. Dark corrected. 10"SCT Homebuild CCD camera. Some MAXIMDL CS2 Strange looking galaxy, a bit of a mess.. Thx for looking Dirk ------------------------------------------------------------------------ Both made it to my server. Usenet amazes me sometimes. A post won't hit your own server but show up on the other side of the world just fine. That's another one on my to-do list. Looks like yet another clear night and a third night of a dead computer power supply. They have one coming at least. I can't even process as all my images are on that computer and now the supply is totally deceased. What chip do you have in your camera? Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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