Summary

• The below image is full frame image with Quasar KUV18217+6419 located approximately in the center of the image.
  • See the Sky Tools 3 with DSS Image screen capture below to locate Quasar KUV18217+6419.
• The image is calibrated with darks and flats.
• The image black point set to 275 and image white point set to 449 in order to see the background details.
• North is at the top edge of the image.
• The first order blazed grating spectrum is on the left side of the object (star, quasar or galaxy).
  • Compare the differences in brightness of the first order blazed grating spectrum on the left side with the first order un-blazed grating spectrum on the right side.
• The bright first order blazed grating spectrum is on the left side of the object.
  • Short wavelengths are at the right side of the spectrum.
  • Long wavelengths are at the left side of the spectrum.
    • Telluric O₂ absorption line at 7594 Å is seen in all the spectrums at the left end.
• The dim first order un-blazed grating spectrum is on the right side of the object.
  • Short wavelengths are at the left side of the spectrum.
  • Long wavelengths are at the right side of the spectrum.
    • Telluric O₂ absorption line at 7594 Å is seen in all the spectrums at the right end.
• The spectrums that stand out being different are:
  • Star IY Dra spectrum which is to the left of Quasar KUV18217+6419.
    • See the Sky Tools 3 with DSS Image screen capture below to located IY Dra.
  • Quasar KUV18217+6419 spectrum analysis
  
  

Monitor Test Pattern

The following test pattern is to help you adjust your monitor to best view the CCD astro images. The test pattern is used for adjusting monitor brightness, and contrast. Adjust monitor brightness and contrast to see all 16 gray scale levels. The most important adjustment when viewing astro images is to see the differences in all of the black bands.