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DaveNicko

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  1. I got a bit too obsessed very briefly looking for F Bird. He (I am making an assumption here) is referenced by the astronomer Sherburn Burnham in the following correspondence in Astronomical Register: https://articles.adsabs.harvard.edu/pdf/1872AReg...10..292B And has submitted correspondence in his own right: https://articles.adsabs.harvard.edu/pdf/1867AReg....5..209J (see p7 of the PDF) He was evidently from Birmingham, UK. Dave
  2. Interesting, thanks for the write-up! Indeed, more data would be good 🙂 Dave
  3. Excellent stuff! Interesting article. What stands out for me is figures 2 and 3 which show that even though a lot of telescope time was spent on the star there are still very large gaps in the data and highlights well the important input amateurs can have here. I do intend to get out the SLR to see what I can do with bright targets, but am still happy with visual obs with the binoculars at the moment. Although the weather certainly isn't playing ball right now! It is encouraging to see light curves like this - I am very impressed with your results! Dave
  4. Thanks! I am aware of the links you sent but thank you for forwarding them on 😃 I do intend to try some photometry with the DSLR, I'm interested in how far I can push the equipment I already have. This will also make me understand what I want to study in the future. It is possible that if I can use the 150-600 then that can be my "refractor" and I can use it firstly untracked, then add a mount with a view to again getting the most out of it (if I can work with any focus and zoom creep, and they don't become too frustrating). Maybe then I can dream of putting a c8 on the mount. But that's a way off yet - time is my issue at the moment! Dave
  5. Hi James, Thank you for your detailed explanation! My thought process was that averaging a number of frames would help with the noise, but now I realise that the moving average taken of each value performs the same function. It is obviously better to do it the way you have so as not to "hide" any results. It is very impressive that you have detected the drop in magnitude for such a faint star with relatively modest equipment! This bodes well for me when I start to look into variable star photometry with a camera. I am submitting my observations to the BAA VSS database, I'm currently looking at binocular variables and submitting those with help from one of the BAA members. I do have a camera (Canon 7d) and a lens (150-600mm) so in principle I could start using that (with my un-tracked tripod) with some of the brighter variables. I then will think about what direction I take, be it mount first to use with the camera/lens combination, then a small refractor or newtonian for use with the 7d (or Fuji X-T1), before investing in a CCD, or another route. I want to first have some experience with visual variable stars first - starting with binoculars and maybe also looking at a few telescope objects (to look at with my 200mm dob). In the meantime I find posts like yours very interesting, so thank you! I love a bit of data analysis (and stats) so appreciate all this info! Best wishes, Dave
  6. Really interesting! Is there anything you can do to improve the noise issue? Averaging the data from every 10 images perhaps (by stacking, darks, flats, biases)? Not sure what effect this has on photometry. What equipment are you using (apologies if this is in your signature - I don't see signatures on mobile)? I'm not a CCD/CMOS observer yet - I have just started my journey of variable star observations with binoculars. But interested to know if you can get more out of this data! Dave
  7. Hello all, It has been while since I last posted here, but now I have a little more time I have started to get out with the telescope a bit more. I have also started down the path of variable star observing with some excellent help from the BAA. While outside I have decided to have a bit of an experiment with a bit of wide-field photography with the equipment I have. This probably comes as no surprise to people here, but I was astounded with my results. This really was a lazy effort, with the camera set to take 200 photos while I was doing something else. No tracking, just on an old (slightly broken) gorrilapod with a cheap tripod head. Details: Camera: Fuji X-T1 Lens: Fuji XF 35mm f2 Pic 1 – Orion Date: 11th January Lights: 200 (2 seconds @ f2) Flats: 23 Darks: None! Biases: None! Pic 2 – Cassiopeia Date: 16th January Lights: 100 (10 seconds @ f2 – originally 200 but there were some bad lights so I chose a random 100 in the middle somewhere and hoped they would be OK) Flats: 23 Darks: 42 Biases: 80 The key here for me was the lights (no surprises there) and also the background extraction. I used SIRIL on linux manually for Pic 1 and with the script for Pic 2. I would be interested in what people think – and what I could do to improve (longer subs and some darks for Pic 1 I think would help). Both images are cropped slightly to avoid the bad coma from the corners of the 35mm, but quite honestly I am blown away with what I have captured here. I never expected to pick up Barnards loop on an un-modified camera (and with 2s subs no less)! Dave Pic 1 - Orion Pic 2 – Cassiopeia
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