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Thread: Markarian's Chain With Not Much Data

  1. #1
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    Default Markarian's Chain With Not Much Data



    Hi Everyone,

    Last night had its ups and downs for sure. That is what it is all about though! I guess you really would not appreciate the best nights if you did not have the not so best nights too.
    I feel very fortunate to extract what I could here. My goal was to try to frame this image up with the scope and camera focuser rotation and that did work out well. Unfortunately, there were significant amounts of high sheet cirrus clouds all over the sky. When nightfall came, the chain was fairly low at about 35 degrees and above the city where I live. The images are 120 seconds at iso 800 and the histogram peak was running about 2/3 to the right. Yes, way too much for sure. I started imaging anyway. Guiding was kind of poor with a total rms err running between 1.3" and 1.7". Stars were less than perfectly round, but I imaged for 2.5 hours and then tried my second ever meridian flip. It did not work as well as the first time I tried it. The scope moved fine, but the guiding was all over the place! I shot an image and the start looked like meteors!
    I sent the scope to M108 in the NW sky just to see if guiding was better there and it definately was. Total rms was under 1" consistantly. As good as ever. I then moved the scope back to Markarians Chain and I crashed into the tripod HC holder (I had moved it DA!). Well, that was it for me, but I did start guiding just to see how it was and it was okay. Not great at a total rms of about 1.5", but about as it was on the other side of the meridian. Good to know anyway.
    Well, this is my second process of the data. The first had about 2.5 hours of 120 second subs at iso 800. The result was poor in my opinion. I went back into DSS and chose just the last hour of subs. No, not much at all, but the end result was a much better image. Wish that I had not crashed and could have gotten more data! Well, I guess that I could have calibrated again, but at 0130, nah!

    [url=https://flic.kr/p/2fkysdE]

    Please reply with comments/critique.

    Thanks,
    Jim
    Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
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    Default Re: Markarian's Chain With Not Much Data

    Nicely framed, Jim! I like it!

    Don't let the high sheet cirrus get you down. Sometimes the sheet goes ok, other times it's just full of sheet.

    And I don't give a sheet about what anyone says, I like your image.
    sketrip, Juno16 and Gmetric like this.
    Bryan

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    Default Re: Markarian's Chain With Not Much Data

    Quote Originally Posted by bladekeeper View Post
    Nicely framed, Jim! I like it!

    Don't let the high sheet cirrus get you down. Sometimes the sheet goes ok, other times it's just full of sheet.

    And I don't give a sheet about what anyone says, I like your image.
    Ha!
    You had fun with that! I did too!

    Thanks Bryan for making me laugh and your nice comment on the image!

    Thanks,
    Jim
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    Default Re: Markarian's Chain With Not Much Data

    I agree with Bryan, Jim. This is a very nice image.
    Thank you.
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    Default Re: Markarian's Chain With Not Much Data

    Love wide field images...keep them coming.
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    Default Re: Markarian's Chain With Not Much Data

    Quote Originally Posted by Don Quixote View Post
    I agree with Bryan, Jim. This is a very nice image.
    Thank you.
    Quote Originally Posted by Skybird View Post
    Love wide field images...keep them coming.
    Thank you very much DQ and Skybird!

    This hobby is so much fun and rewarding. Now that I am retired, I can take advantage of the three good nights of each month!

    Thanks again!

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    Default Re: Markarian's Chain With Not Much Data

    Sounds to me like you had a tough old night. Given the trials and tribulations, you worked some magic with this image. I like it!!!!!
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    Default Re: Markarian's Chain With Not Much Data

    Thanks G!

    Did have a few issues for sure. Look like I have some good findings though. The biggest was framing. The few targets that I have shot so far were cropped a good bit so framing was done with cropping and not having to rotate the focuser.
    Yeah, and reprocessing with only the last hour of data and not including the first 90 minutes of light polluted subs definitely helped.

    I am okay with it considering the limited exposure time. I will give it a try again sometime.

    Thanks again for your kind comments G!

    Jim
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