Recent Blogs Posts

  1. The Witches Broom (aka, the Western Veil nebula)

    by , 10-08-2018 at 12:41 PM
    This is a very busy area of the sky for sure. The number of stars can overwhelm the photo, especially if they are slightly out of focus or allowed to bloom in the camera. The Atik is supposed to prevent the blooming and I explained the use of the cutoff filter.

    The clouds rolled in around 12am, which shut me down. My Clear Sky forecasts was useless all weekend. I usually compare it to that from Intellicast. Being by the water can add challenges associate with fog too. My temperature ...
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  2. M45- multi day

    by , 10-01-2018 at 12:30 PM
    For some reason my Flickr link appears broken, while it was working earlier. I will look into it when I can.

    Quote Originally Posted by JohnP_1 View Post
    Thanks Scott,

    I turned up the backlight and I see what you mean by the purple hue. I tweaked the color temperature and saturation a bit.

    John

    Click image for larger version. 

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    PS> I am going to replace the Flickr version with the new one, so the hue will mostly be evident in the forum hosted frame.

    Quote Originally Posted by Hondo View Post
    Nicely
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  3. The Iris Nebula (NGC 7023 and Caldwell 4)

    by , 09-20-2018 at 12:25 AM
    I agree. I was quoting the spec, but, the power consumption goes way up when you try to push it to the limit and it becomes unstable. After I stretch a few of the first frames I realized what was going on and warmed it up to -10C, which is where I usually set it during warmer weather. That took care of the problem completely. I will try your tip about keeping it at temperature for an hour.


    Quote Originally Posted by KathyNS View Post
    Nice pic! More data will help control the noise level.

    I find I
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  4. Dark Energy might falsify String Theory

    by , 08-10-2018 at 02:06 AM
    Quote Originally Posted by not_Fritz_Argelander View Post
    OK I've gone ahead and collected some reading material. The paper at the heart of these interesting claims is at

    https://arxiv.org/abs/1806.08362

    It has been notoriously difficult to construct a meta-stable de Sitter (dS) vacuum in string theory in a controlled approximation. This suggests the possibility that meta-stable dS belongs to the swampland. In this paper, we propose a swampland criterion in the form of |∇V|≥ c⋅V for a scalar potential V of
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  5. Dark Energy might falsify String Theory

    by , 08-10-2018 at 02:05 AM
    Quote Originally Posted by not_Fritz_Argelander View Post
    OK... some initial reaction.

    There is this analogy that so far has led to the only positive results for string theory: the Anti de Sitter - Conformal Field Theory correspondence. It looked like a promising way forward for quantum gravity and helps to make sense of experiments at the Relativistic Heavy Ion Collider.

    https://en.wikipedia.org/wiki/AdS/CFT_correspondence

    But it always stuck a little bit. The is it possible to make this correspondence for
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