> 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.

To check the polar alignment of your telescope look trough the polar scope. When turning the Ra axis the polar star should move in the exact circle in the eyepiece without any deviation.

Removing the DSLR build in IR-cut filter will give you at least 50% more sensitivity for hydrogen alpha emissions of the nebulas. Also the camera will be more light sensitive at dark allowing you to shoot more faint objects.

We can check what is like to process day shot with similar to astrophotography techniques. It is cloudy in Bulgaria for the next week or so and I took shots of the nearby mountain trough the fog with 200mm lens.

Most of the modern LED backlight screens including Laptops, TV and smart phones use PAM technique for Pulse-amplitude modulation. This means that they switch on and off state very rapidly.

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