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michael.h.f.wilkinson

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About michael.h.f.wilkinson

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  • Birthday 21/01/62

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    http://www.cs.rug.nl/~michael

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    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
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    Groningen, The Netherlands
  1. Cheers, Jake. I was using the C8 with 2.5x PowerMate. I am also not sure it is a rotation effect, at 120s it should not be this pronounced. I am looking into internal reflections (not from the L filter, that has been replaced). A couple of white ovals in the south temperate band seem to have a ghostly double as well. When I am back at work tomorrow, I might try so-called blind deconvolution methods, which estimate the point-spread function from the data. This might show up any internal reflection.
  2. Nice results. Looks like something new is appearing on the eastern limb. A bright patch of faculae seems to be there.
  3. Cheers Shane! Hadn't noticed it there. It disappears when using deringing in Registax, but that causes some blur on the edge. I wonder if it in part stems from the duration of the video I took, and it is due to rotation. Might try to derotate.
  4. First shot of Jupiter with the ADC in place. It is a bit fiddly adjusting the settings, but the FireCapture ADC tool helps a lot. Seeing was rather wobbly, and I might want to reprocess later, but despite wobbly seeing there is quite some detail showing There is a curious effect on the righthand boundary, Not sure if it is a stacking artefact, or whether wavelet processing enhances the slight shadow which should be on that limb, I think.
  5. I thought the CG5 had a Vixen dovetail clamp, so the OTA should have a Vixen dovetail
  6. I also prefer the wedge to Baader AstroSolar film, for fracs. On reflectors and catadioptrics wedges aren't an option
  7. Nice work. Seeing was complete mush here, so I binned all the data
  8. Still some good detail in those H-alpha shots (H-alpha is less affected by seeing). Hope things improve shortly
  9. As I arrived early at work, the sky was so clear that I quickly set up the 80mm on the EQ3-2 I keep in my office, and snapped 4000 frames in WL and Ca-K. I stacked 400 each for the surface views, and stacked 1200 Ca-K frames as well for the proms in the part inverted views. Seeing wasn't great, but not bad either. WL, grey scale: WL, pseudo colour: Ca-K, grey scale: Ca-K, pseudo colour: Ca-K part inverted: Ca-K, part inverted + pseudo colour: Nice to see some activity on the disk
  10. And ADC is an Atmospheric Dispersion Corrector (rather than the more usual Analog-to-Digital Converter). I didn't use it this time round as it adds a load of faffing around with the settings. I did experiment with it (between showers) yesterday and got the hang of FireCapture's ADC tool. Given crud seeing and dodging showers with an improperly cooled scope (because it had to be rushed inside) the results are pretty hopeless, but I did learn quite a bit. The addition of a T2 rotator, which allows me to set the rotation angle of the ADC quite freely makes life a lot easier.
  11. Very nice result!
  12. Very nice indeed
  13. Nice collection. Not sure whether I will manage anything here today. There are clear bits, but also lots of showers
  14. I just measured the widest point of my SLV 15mm. It is 46mm, so I do not see how that could possibly cause problems in a binoviewer, unless your IPD is very, very small.
  15. I have done this and with crop sensors you are fine. Full frame would be a problem