WeBo1 and Mel15

Do you remember december molecular trophies? There were hydrogen alpha only band of Melotte 15 open cluster in the middle of the Heart nebula IC1805. I collected some more – oxygen III band and RGB star color and here comes the color result below. It is all pictured with QHY163M camera, 130mm Photoline refractor and EQ6 mount. All from my backyard, and that is total about 15 hours of exposures. Pretty lot, huh?

Melotte 15 in the Heart nebula. HaOiiiRGB composite

Large version here https://astrojolo.com/wp-content/uploads/2017/01/2017-01-26-Mel15.jpg

Melotte 15 is pretty famous region, so there is nothing new to be seen here. However if you take a closer look into the lower left part of the frame you will spot small egg shaped nebula – that is WeBo1 planetary nebula. And that is something new 🙂 

Clear skies!

4 thoughts on “WeBo1 and Mel15”

  1. Lucas,

    What gain setting do you use for N.B. work? I’m using now 20 gain, but I’m not sure if I should drop to near unity, like 13 or so?


    1. Luis,
      I use gain 0 and offset 40 for narrowband pictures. And 600s exposures with f/5.5 refractor. I also thought about unity gain, but then full well capacity is pretty low, and stars become oversaturated much quicker.
      Basically I do all long exposure work with gain set to 0. I did some lucky imaging with times 2-10 seconds and then I’ve been using unity gain settings.


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