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36319Re: NGC 6992 "Veil portion" in Ha and OIII bi-colour

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  • dietmar hager
    Aug 31, 2008
      very nice shot, Gordon!
      Dietmar
      --- In tmboptical@yahoogroups.com, "Gordon Haynes" <gphaynes2006@...>
      wrote:
      >
      >
      > Hi all
      >
      > Well according to the records August has been the wettest month on
      > record and I can believe that. The weather was looking a bit more
      > promising last night and following a suggestion from a fellow
      imager I
      > had another go at NGC 6992 but this time I added some OIII data to
      it to
      > make a bi-colour image. Luckily the sky stayed cloud free long
      enough to
      > get 9x10 minutes unguided subframes for each channel. The seeing was
      > poor due to very faint mist in the air later in the evening and the
      sky
      > never got totally dark despite no moon being present. The subframes
      were
      > dark subtracted (10 darks), then aligned and combined using median
      > combine in Maxim DL and then the two resulting master frames were
      colour
      > combined in Maxim DL using Ha for red and OIII for green. The
      resulting
      > colour image was then processed in Photoshop CS2. Image was taken
      > through my TMB 115 with SX H36
      >
      > I have enclosed the full widefield version as well as a cropped
      closeup
      >
      > NGC 6992 in Ha and OIII widefield
      > <http://www.imagingtheheavens.co.uk/USERIMAGES/NGC6992colour.jpg>
      >
      > NGC 6992 in Ha and OIII closeup
      >
      <http://www.imagingtheheavens.co.uk/USERIMAGES/NGC6992colourcrop.jpg>
      >
      > Thanks for looking and hoping for a better September
      >
      > Best wishes
      >
      > Gordon [:)]
      >
      >
      >
      > [Non-text portions of this message have been removed]
      >
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