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Dave Smith

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About Dave Smith

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    White Dwarf

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    Maldon, Essex
  1. That is an interesting curve. Any idea why two peaks? Dave
  2. That's a lovely smooth curve James. Nice work. Dave
  3. Lovely set of data. This one brings back memories. Many Moons ago I did the Open University practical course "Observing the Universe" in Majorca and this star we used as a team project introducing us to photometry using MaximDL on one of the nights. Dave
  4. Hi Billy. I have never had any concerns about atmospheric correction because my comparison stars have always been in the same field of view. If there are no "official" guide stars in the FOV I choose others using Guide software with the UCAC4 star database added. Mostly, however, I use the comparison stars given on an AAVSO chart. My FOV is around 30'. When I used my 90mm refractor the FOV was approx 1.5 degrees but had no problem with atmospheric correction. https://www.projectpluto.com/ Hope that helps Dave
  5. Lovely weather last week including clear nights. Here are my variable star results from 4 nights. All are HADS stars. Stars that pulsate in size and brightness. Dave
  6. Presumably if you didn't plot the comparison stars then it will have a better scalefor the main star. Dave
  7. I like the shape of that curve. The cloud certaily is showing its effect on the last readings. Patrick will likely find this useful. He uses a curve fitting analysis which doesn't require a whole period, although he does prefer a period or more. I also have not been able to get AIJ to plot absolute magnitudes, although I must admit that I haven't really tried. My technique is to generate a BAA report and import that into Excel where there is much flexibility to how it is plotted, labels etc You seem to have well and truly been hooked onto variable stars ?? Dave
  8. I was fascinated by Graeme's graph for this star so just had to have a go. Fortunately it was clear most of the time last night. Dave
  9. Why wait, He's already expecting data from you. I usually send the BAA data file. He prefers that you do not submit the data to BAA or AAVSO straight away so that he can do his stuff first. I was advised 3 months but I have only waited a month as otherwise I would forget altogether. Dave
  10. Wow - that is brilliant and an unusual shape. I wonder if it is multiperiodic although it is not marked as such on the HADS spreadsheet. With variable stars there is no need to worry about focusing, in fact some defocus slightly to avoid saturation, as long as neighbouring stars don't start to merge. Congratulations on your first HADS Dave
  11. I can't get a direct link but the page I had in mind can be found by following the Beginners link on the BAA website. http://www.britastro.org/vss/ There is also much detail on visual observing on Gary Poyner's website http://variablestars.co.uk Gary has impressivly submitted more than a quarter of a million visual observations from light polluted birmingham. The Society of Popular Astronomy also have a guide to visual observing which is linked to on this page https://www.popastro.com/main_spa1/variablestar/ Hope they are useful. Dave
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