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Pompey Monkey

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About Pompey Monkey

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    Sub Dwarf

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  • Interests
    Astronomy, cycling, science.
  • Location
    Hampshire, UK
  1. What camera are you using? 60 (or 45) 60 second subs won't get you a lot of nebulosity at all with a DSLR. If you have poor data to start with, then you are already facing an uphill battle.
  2. That thing is really, really, faint. Good work.
  3. Spot-on, apart from the Read-noise. This is a constant for all exposures relating to the electronic process of converting the charges on the sensor into an output signal. This is also known as Bias. The noise component measured in electrons per pixel, per second, is the accumulated charge on the sensor (hence "per second") for each exposure. his is known as Dark current. Dark current is a lot lower in the newer CMOS cameras compared to CCD. There are other differences, but That is for someone more knowledgeable than me to answer!
  4. What @ollypenrice said: dithering will really help you with the noise.
  5. Did you restart PI after copying the files?
  6. There is always the azeq6 gt if you want to do visual and AP with the same mount. Skywatcher mounts are excellent value for money, easy to use, and well supported through ASCOM/EQMOD for AP.
  7. It was, just. A clear horizon to the NNE was needed, so i went up portsdown hill for a better view.
  8. Lovely picture and the best comet I've ever seen! I can see the same noctilucent clouds from Portchester (Hants) Too.
  9. It will be fine. Any dust that might manage to get on the sensors window can be corrected for with flats. If you want to clean it prior to fitting the CC, just use a puffer:
  10. I don't know how to calculate any of it But here is a nice write-up of the idea I am trying to convey. https://darkskydiary.wordpress.com/2011/05/04/twilight-vs-light-pollution/
  11. I think it might depend on your local light pollution. If the local light smog is significantly worse than the sky brightness for nautical dark, then you might as well carry on...
  12. As long as the dew point temperature is higher than ambient, dew can form. It is even more likely on surfaces like, wait for it, metal and glass that radiate their heat directly into space (under clear skies). The temperature of these materials can be considerably cooler than the surrounding air. This is why fans are often used on reflector primaries: passing the ambient air over the surface of the glass is actually a warming process. So, it could still be dew.
  13. I fhi k you may need a 35 mm extension:
  14. Hmmm. It might be time to close this thread...
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