Angella Rodgers

Spectroscopy of Vega, Polaris and Deneb with Angella, Alan and Chris Ford 28-29/5/2019

Angela, Alan and Chris Ford came to my house tonight and did a brilliant job calibrating CCDSPEC spectrometer on Equinox Pro 80mm, and hand guiding it to obtain three spectra. Amazing for first ever try!


The team (Chris Ford, Angella, Alan, Andrew):

Angella controls the imaging software while Alan hand guides the scope:

Calibrating the CCDSPEC (Angella, Alan and Chris):

The image below taken with Samsung S7 phone hand held at eyepiece of CCDSPEC spectrometer shows compact fluorescent bulb with spectrometer slit and cross-hairs of illuminated eyepiece:

Compact fluorescent bulb spectrum:

Compact fluorescent bulb spectrum profile in RSPEC after calibration (after calibration shows angstroms of wavelength rather than pixels on x-axis):

Angella used the following graph to calibrate the spectrum of the compact fluorescent bulb – it shows known wavelengths of specific lines in the length (prepared using data in Wikipedia):

Vega (Angella and Alan) – the profile showing the Vega spectrum compared to that of reference library A0V spectrum shows close match with hydrogen Balmer lines:

Polaris (Angella and Alan) – much fainter and more difficult to obtain high quality spectrum tonight – nevertheless some significant lines can be seen to match on the rather noisy spectrum obtained tonight:

Deneb (Angella and Alan):



Thanks to Ed for bringing VideoPad to our attention at begginners’ RAG group. His super demonstration showed how useful it was. It was clear that this is a good replacement for the much lamented MovieMaker. I went home and tried out the free version. As ever with video software it is a bit tricky, especially when trying to make changes to something you have already done. I went back and inserted a title and then had to shuffle the clips to fill in the gap. Still I was delighted to be able to crop the clips and make a compilation.

I’m afraid my first attempt is not astronomical. Still you might want to see how it turned out. It is at – . I now know that using the typewriter effect for the title is not good, as it makes for a blank preview image. To hook people in I would have been better with no title at all. Still it did what I wanted to.

So far I’ve not been nagged about upgrading to the paid version, but I am so pleased with it that I think I will do that eventually. I’m looking forward to trying out other features.

Thanks again to Ed for suggesting this software. I look forward to reading anybody else’s comments and tips when they have had a chance to try it out. I’ll let you know when I’ve done something a little more RAG orientated 🙂