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About athornett

  • Rank
    Star Forming

Profile Information

  • Gender
  • Interests
    Visual observing, spectrometry, radio astronomy, microscopy
  • Location
    Lichfield, Staffordshire, UK
  1. I have now also uploaded a 50 minute video of the IAS: https://roslistonastronomy.uk/video-from-international-astronomy-show-2018-12-13-october-2018 Andy
  2. I have posted a review this year’s International Astronomy Show here: https://roslistonastronomy.uk/international-astronomy-show-friday-12-10-2018 Andy
  3. athornett

    Spectrum of Altair

    My attempt today to produce an instrument response curve: https://roslistonastronomy.uk/attempt-to-generate-instrument-response-curve-in-rspec-software-for-ccdspec-using-altair-spectrum-from-10-10-2018 Andy
  4. athornett

    Spectrum of Altair

    Hi Robin, Re your question regarding how I calibrated - I used my Vega spectrum (hence why I took the spectrum last night) and (because I knew main lines wavelengths on Vega spectra) calibrated CCDSPEC/QHY6 using that - was that OK to do? Re: hot pixels - I do seem to have a lot of hot pixels on the QHY6 which become evident on exposures over 30 secs - the exposure time last night was 50 secs per spectrum. Should I be concerned? Andy
  5. athornett

    Spectrum of Altair

    Hi Robin, Thanks again for brilliant advice - please keep it coming - I really appreciate having a mentor on the spectroscopy side! So, now to try and correct my spectrum for instrument performance....... Andy
  6. athornett

    Spectrum of Altair

    Thanks DP - that is really kind of you to say that. Andy
  7. Spectroscopy of Altair (and Vega) in Lichfield, UK 11/10/2018: A new star tonight for me – Altair. I have not taken a spectrum of this star before. Being also an A type star (A7V), it was going to be similar to Vega (A0V). Therefore, I took a spectrum of Vega for comparison too.. Taken using CCDSPEC spectrometer with Sky Watcher Equinox Pro 800mm Telescope on alt-az undriven Manfrotto mount – hand-guided for 50 second exposures. RSPEC software has some great reference spectra which I was able to use to calibrate these images this evening. Cross checked using my own image of Vega as reference spectrum. Note Vega = A0V spectral type Altair = A7V spectral type More information at https://roslistonastronomy.uk/spectroscopy-of-altair-and-vega-in-lichfield-uk-11-10-2018 Andy
  8. athornett

    Neon lamp to set spectroscope

    On the RELCO starter spectrum below, my CCDSPEC spectrum is graphed against the ALPY spectrum from Three HIlls Observatory from Robin above, and I have marked the lines I identified together with those lines that ISIS use for calibration - this gives some more lines for me to use at LRO. Andy
  9. athornett

    Neon lamp to set spectroscope

    Hi Robin, I will take another spectrum of the RELCO starter bulb with longer exposure to see if I can bring out more lines. Do you think my current identifications look about right? Andy
  10. athornett

    Neon lamp to set spectroscope

    The camera used on the CCDSPEC is the QHY6 - this does not have an IR/UV cut off filter does it? I can't see it on specs when I look camera up on line Andy
  11. athornett

    Neon lamp to set spectroscope

    I have now had a go at identifying the lines on the above CCDSPEC Spectrometer RELCO Starter Spectrum using http://www.ursusmajor.ch/downloads/sques-relco-sc480-calibration-lines-5.0.pdf Once I am happy with the identifications, I will tidy up the diagram! Robin - do you think I have correctly identified the lines? Also included below are pictures of the CCDSPEC Spectrometer and my homemade RELCO starter calibration light and a dismantled RELCO Starter Unit showing the bulb as it comes out of the starter. Andy
  12. athornett

    Neon lamp to set spectroscope

    Thanks very much Robin - for future reference I have loaded up your calibrated version of my RELCO spectrum here. The spectrum here was taken using CCDSPEC spectrometer - I attempted to exclude extraneous light by wrapping both CCDSPEC and RELCO light in 2 layers but some light probably got in so spectrum won't be perfect. This is spectrum using RELCO and CCDSPEC - not using a telescope. Robin used following lines for calibration, and commented that it would be better to add a few more lines, making sure they are well spaced and cover the full spectrum (particularly the blue end, but they were rather indistinct in your spectrum) and do a 3rd order fit. The dispersion is approximately 6.5A/pixel , though this varies along the spectrum of course as it is non linear. 4545.05 (Ar) 5852.48 (Ne) 7067.22 (Ar) Andy
  13. athornett

    Neon lamp to set spectroscope

    Hi Robin In image below I have tried to match your spectrum to mine. It is not obvious to me where I should stretch the image/i.e. a second data point compared to your data - can you help? I have enclosed my combined image + data as ZIP file. Andy RECLO Calibration from Stargazers Lounge 021018.zip
  14. athornett

    Neon lamp to set spectroscope

    That's brilliant. Thanks Robin! Andy
  15. athornett

    Neon lamp to set spectroscope

    I have just had a look at the 200 lines/mm chart in the atlas at www.ursusmajor.ch/downloads/sques-relco-sc480-calibration-lines-5.0.pdf and sadly I can't see any obvious match on the lines with my chart - ahhhh! Help please! Andy

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