The first album cover below shows the visible light spectrum of the star Vega which I recorded with my telescope's diffraction grating and DSLR camera on Aug 28 2014. In the spectral curve in the X-Y graph note the 4 hydrogen Ballmer absorption wavelengths which are revealed by 4 corresponding dips in the spectral curve's amplitude at 4107, 4340, 4861 and 6562 Angstroms. The amplitude of the curve is light intensity for each wavelength along the X axis.
At the bottom of the image note that I have represented the collisions of electrons in 2 hydrogen atoms each starting out with the same amount of energy; in the collision on the left side of my image a very energetic photon of light having a wavelength of 4107 Angstroms is shown to collide with the electron in orbit shell n=2 of the first hydrogen atom thereby raising the electron to higher level orbit shell n=6; during the collision the energy of that photon has been absorbed and therefore the telescope's camera does not record the color corresponding to that wavelength (which is violet for 4107 Angstroms). That is why a black area appears in the voilet region of the color spectrum above the gold arrow. Similarly on the right side of my image a less energetic photon of light having a wavelength of 6562 Angstroms is shown to collide with the electron in orbit shell n=2 of the second hydrogen atom thereby raising that electron to a lower level orbit shell n=3; the less energetic collision caused by the second photon results in absorption of the second electron and therefore as before the telescope's camera does not record the color corresponding to that wavelength through ones telescope (which is red for 6562 Angstroms).
I captured this image with a TMB-92L refractor, a Canon 550D DSLR camera and a spectroscopic diffraction grating known as the Star Analyser 100.
I created this spectral graph with a program called Rspec (Version 1.7). If you'd like to do this kind of spectroscopy please visit the website for Rspec and the Star Analyser 100 to find out how to get started: http://www.rspec-astro.com/
Please click on any of the album cover images below to reach the entire collection of images for the planet or moon shown. For example clicking on the Jupiter album cover takes one to 3 separate collections of images captured between 2010 and 2014. Clicking on the 2012-2013 collection of images opens up every image I've taken of Jupiter between August 30 2012 and May 1 2013. Each of these images may be clicked on to reach a larger version of the image together with a more detailed description.
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