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Thread: Things Flying Through M42

  1. #11
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    Default Re: Things Flying Through M42



    Quote Originally Posted by Juno16 View Post
    Thanks a bunch Scott and Kathy!

    .......... I guess that takes targets close to the celestial equator out of the running for imaging until they are located in different parts of the sky.

    Thanks a bunch,

    Jim
    Targets along the celestial equator will always be at the equator... Orion does not wander. Its Dec does not change, only its R.A. as it crosses the sky.
    The only cure is to take many exposures and let the processing software remove the trails, or throw them away, or deal with them.
    I have not only those, but a major airline route between NYC and Boston to my south.
    I can get a plane almost every 45 seconds during rush hour. There are usually many in the sky at once.
    PixInsight removes them nearly perfectly every time.
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    Default Re: Things Flying Through M42

    Thanks Jim!

    Yes, makes sense that the dec would not change. I thought that maybe reflections from the satellites would be less at different times of the night too (angular from the sun). I only imaged M42 one other time in the early morning hours and did not notice the satellite streaks.

    I will process what I have, but a got clouded out early in the night. Very good to know that processing can possibly “clean” things up.

    Wow, you certainly have some nearby sky traffic!!!

    Thanks,
    Jim

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    Default Re: Things Flying Through M42

    As Jim stated, the equatorial positioning of these objects doesn't change, except from our perspective of position relative to each other. The Clarke Belt is the 'parking line' of geostationary (typically communication) satellites serving the entire world. If you use any dish related TV programming, your satellites are there. A few of the geo's are in a slightly inclined orbital position, but from our vantage point, only a minor few degrees. Any part of the night sky that "moves" along this equatorial plane is going to have geo's passing through the view as the earth rotates.

    Our Clarke belt view: http://www.1a-aerials.com/wp-content...s-1136x735.png
    Last edited by SpyderwerX; 01-05-2019 at 04:53 PM.
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    Default Re: Things Flying Through M42

    You can also get similar trails at higher celestial latitudes due to Molniya orbit satellites - these are used for Russian military communications where the users are well away from the equator, above which standard geostationary satellites are generally located.
    I had one 'contributing' to successive shots for a series of M27 images I took a couple of years ago.

    https://en.m.wikipedia.org/wiki/Molniya_(satellite)
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    Default Re: Things Flying Through M42

    Quote Originally Posted by Juno16 View Post
    Thanks Jim!

    Yes, makes sense that the dec would not change. I thought that maybe reflections from the satellites would be less at different times of the night too (angular from the sun). I only imaged M42 one other time in the early morning hours and did not notice the satellite streaks.

    I will process what I have, but a got clouded out early in the night. Very good to know that processing can possibly “clean” things up.

    Wow, you certainly have some nearby sky traffic!!!

    Thanks,
    Jim
    Here's what had to be processed out when I imaged the horsehead region...



    Gotta love it...
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    Default Re: Things Flying Through M42

    Quote Originally Posted by jimminCT View Post
    Here's what had to be processed out when I imaged the horsehead region...



    Gotta love it...
    And keep in mind that with SpaceX and all these other private companies that want to sell internet for all, soon you will see 10 or 20 times as many trails as now.
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    Default Re: Things Flying Through M42

    The other object in your photo is the ever elusive stealth chameleon worm. It’s known to appear and disappear briefly in front of camera lenses. It sees light being gathered in front of lenses and absorbs the light and then slinks away. They area very difficult to see but if you have a dust blower just puff at it a few times. They don’t like the sound it makes and will usually migrate to another light source. Sometimes they just get full and the drift away in the air.
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    Default Re: Things Flying Through M42

    flipping through each image i can see you have a giant dust bunny oscillating close to your sensor (possibly a strand of fibre)

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    Default Re: Things Flying Through M42

    Quote Originally Posted by yobbo89 View Post
    flipping through each image i can see you have a giant dust bunny oscillating close to your sensor (possibly a strand of fibre)
    Great band name! The Oscillating Dust Bunnies!
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