Celestial hemisphere:  Southern  ·  Constellation: Carina (Car)  ·  Contains:  HD302978  ·  HD303102  ·  HD91533  ·  HD91572  ·  HD91595  ·  HD91619  ·  HD91824  ·  HD91943  ·  HD91969  ·  HD91983  ·  HD92007  ·  HD92024  ·  HD92044  ·  HD92060  ·  HD92121  ·  HD92206  ·  HD92207  ·  HD92313  ·  HD92436  ·  HD92553  ·  HD92703  ·  HD92835  ·  HD92928  ·  HD92982  ·  HD93001  ·  HD93055  ·  HD93114  ·  HD93159  ·  HD93189  ·  HD93307  ·  And 3 more.

Image of the day 03/17/2024

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    Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield
      Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield

      Gabriela Mistral Region | First Light with the DeltaRho

      Image of the day 03/17/2024

      Getting plate-solving status, please wait...
        Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield
          Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield

          Gabriela Mistral Region | First Light with the DeltaRho

          Equipment

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          Acquisition details

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          Description

          Being rather new to the Southern hemisphere and used to a long focal length FOV, I wasn't aware what was in this area.  I framed it up looking at Aladdin and it seemed like there might be some interesting objects.  After the first night of subs, I realized I was shooting one of the most common areas in the sky!  It turned out to be a good test for the Delta Rho with bright nebulae, a star cluster, and dim areas with dusk lanes to manage.

          I am shooting with a QHY600M using the Extended Full Well mode.  I found there is no problem with 10 minute narrowband subs - even at F3.  I could likely go 20 minute with no problem.  But with the RGB subs, even the 2 minutes subs I used here are a showing some saturated star cores.   I may try 30 second subs when I only want the RGB data for the stars.  But here, I wanted to capture the dust clouds that surround Gabriela.  Those are best seen in RGB.   Mouse-over for the starless version where you can better see the dust.

          To bring out the dust clouds I used an emissionless process on the RGB.  This involves subtracting the narrowband data from the R, G, and B masters so I can focus processing on non-emission features like dust clouds.  I created a dynamic SHO master (AKA Foraxx palette) first and then added the emissioness R, G and B masters (less their backgrounds) to the linear SHO master.  I like the result but I've got a lot of practicing to do to get this down.

          Using the DeltaRho for the first time showed that I cannot use the CDK17 on the other side of the L-600 for guiding and backfocus on the DR does not allow for an OAG.  The issue seems to be differential flexure.  Guiding would work near the meridian but any time I pointed more that about 10 degrees away from the meridian the guider would look a happy but the stars on the imaging camera would trail.    A guide scope for the DR is on order!  But in the meantime I thought I'd try going unguided.  This worked much better than expect!  I ran a 400 point model and this produced round stars on ~90% of subs as long as I shot above 40 degrees altitude.   FWHM's went as low as 1.7' which, with an image scale of .74" is about as good as it gets.  Since I don't plan to shoot much below 40 degrees, unguided vs. guide scope may be a push since guiding adds overhead.

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          • Final
            Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield
            Original
            Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield
            B

          Sky plot

          Sky plot

          Histogram

          Gabriela Mistral Region | First Light with the DeltaRho, Kevin Morefield