> Deep-Sky Hunter Star Atlas

  • Posted on: 10 March 2019
  • By: tihomiry

http://www.deepskywatch.com/deep-sky-hunter-atlas.html This is an amazing resource. Detailed atlas of all the sky with NGC and IC objects. All stars up to 10th magnitude. It is more detailed then any of the software available so far. I use it to plan observations and locate fainter objects.
You can print it and have it in your hands. Such an old school feeling! :)
If you have PC on hand during your observation, other good resources are the astronomical databases such as SIMBAD http://simbad.u-strasbg.fr/simbad/ but you need to be more specific in what you are looking for and it is therefore for higher level use.
Another good and more popular resources are Word Wide Telescope and Google Sky. For Mobile, I use SkyEye a very nice app but it shows stars up to 6th magnitude.

Here is one of my shots of M22 Globular cluster in Sagittarius and crop of the same filed from the atlas. Shot is taken in "Kara Tepe" one of the darkest sky in Europe with 200mm f5 telescope and single exposure of 30s and ISO 25600. The smallest dot is a 10th magnitude star. You can see that on the actual photo there is countless stars much weaker then 10th magnitude.
As this is a part of the Milky Way the most fainter stars dissipaters in the noise grain. As stated in the previous article the fainter star is much weaker then the limited magnitude of my 200mm telescope and will go even to 16 - 18+ magnitude.

Recently I got one very good lens the Asahi Takumar 135mm 1:2.5. This is fast telephoto lens and from my point of view a good lens should be with aperture from 1:1,2 to 1:2,8.

Moon at 45% illumination and 70x magnification. With aperture of 200mm,14,1 stops dynamic range, color depth of 23.7 bits at this image there are slight color variation on the moon surface that reveals it’s structure.

This is the beginning of my research on how dark the sky could be and what is benefit of a dark sky for astrophotography. I was inspired from those 2 sites. First one presents mathematical model of how dark the sky is.

You can find my last DSLR Astrophotography article in Bulgarian at page 76. I am sharing my last findings for this publication, Specially written for the Institute of Astronomy.

Satellites, cosmic trash or UFOs, the moving spots are everywhere on the sky. Typical satellite behavior is to reflect sun light. It should be yellow or white and could fade and shine due to its rotation.