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  1. #1
    Richard Crisp's Avatar
    Richard Crisp Guest

    Default Widefield North American Nebula/Pelican/IC5068 in [SII], Ha and [OIII]



    here are two different palettes used for the Na Nebula/Pelican IC5068
    complex.

    http://www.rdcrisp.darkhorizons.org/...c5068_page.htm

    This is widefield shot of 9 square degrees taken with a horribly
    undersampled FLI Dream Machine used on an AP Traveler with a 0.75x
    telecompressor. The effective focal length was close to 475mm which results
    in a plate scale of 10.5 arc-sec/pixel.

    Focusing was a bit challenging but I got "close enough" to see what the area
    looks like.

    Probably I will re-shoot in higher resolution this year.




  2. #2
    News's Avatar
    News Guest

    Default Widefield North American Nebula/Pelican/IC5068 in [SII],Ha and [OIII]

    is there supposed to be an image on this link?




  3. #3
    Chosp's Avatar
    Chosp Guest

    Default Widefield North American Nebula/Pelican/IC5068 in [SII],Ha and [OIII]


    "News" <malcol@NOSPAMhotmail.com> wrote in message
    news:_ozJb.19662$Vl6.3651989@news20.bellglobal.com ...

    There is - and it is quite a good one.



  4. #4
    Stefan Lilge's Avatar
    Stefan Lilge Guest

    Default Widefield North American Nebula/Pelican/IC5068 in [SII], Ha and [OIII]

    Richard,

    neat image, lots of signal. With the colours you gave it it looks a bit like
    an aurora :-)

    Stefan

    "Richard Crisp" <rdcrisp@earthlink.net> schrieb im Newsbeitrag
    news:nXlJb.5835$MA2.4077@newssvr25.news.prodigy.co m...
    results
    area


  5. #5
    Richard Crisp's Avatar
    Richard Crisp Guest

    Default Widefield North American Nebula/Pelican/IC5068 in [SII], Ha and [OIII]

    Thanks for the comment Stefan. The colors are a fall-out from using the
    filters I did. The [SII], Ha and [OIII] set only capture those specific
    emission lines and then I assemble them into a tricolor.

    One way to assign the colors is strictly by wavelength: the longest
    wavelength gets Red, the next shorter gets Green and the shortest wavelength
    gets Blue. That would correspond to the image just below.

    http://www.rdcrisp.darkhorizons.org/...068_S2HaO3.jpg I
    call that palette the "Pillars Palette" because that is the color palette
    used by the Hubble team that took that wondeful shot of the core of M16.
    Same filters too.

    The other way I combine them is to assign Ha to Red (sort of familiar from
    the visual world), [OIII] to Green (again, kind of familiar from the visual
    world) so that leaves [SII] being used for Blue. Here is the image that
    results from that assignment:

    http://www.rdcrisp.darkhorizons.org/...068_HaO3S2.jpg
    I call that Palette the "CFHT Palette" because that is what they did with
    their Rosette Nebula:

    http://www.rdcrisp.darkhorizons.org/..._cfht_page.htm


    Best wishes for the new year folks!
    Richard



    "Stefan Lilge" <slilge@web.de> wrote in message
    news:3ff835c4$0$17560$9b4e6d93@newsread4.arcor-online.net...
    like



  6. #6
    Richard Crisp's Avatar
    Richard Crisp Guest

    Default Thor's Helmet in Halpha

    Last night I was blessed with another clear night. There was a lot of moon
    and it was up high most of the night, but I was using Ha and [OIII] filters
    so I wasn't too worried about it; I was just happy to have a clear sky after
    all the rain we've had recently.

    I took some more data for the Cone project and began taking some exposures
    of Thor's Helmet in Ha and [OIII].

    I did not get but one hour's worth of Ha for Thor but did assemble it into a
    sample shot: sort of an early look-see at what may be in store.

    http://www.rdcrisp.darkhorizons.org/..._thor_page.htm

    I used my Dream Machine exposed through a Custom Scientific 3nm Ha filter.
    The scope was my C14. I used and AO7/ST7 for guiding via an RCOS Optical
    Systems Dichroic Beam Splitter.

    The C14 is running about f/12.46 with the long imaging train hanging off the
    back. At that slow focal ratio, I was running 20 minute exposures and took
    three, which were median combined to make the image.

    More results when they become available.

    Richard




  7. #7
    Chris1011's Avatar
    Chris1011 Guest

    Default Thor's Helmet in Halpha

    >I did not get but one hour's worth of Ha for >Thor but did assemble it into a


    Awesome!

    Roland Christen

  8. #8
    Martin C Germano's Avatar
    Martin C Germano Guest

    Default Thor's Helmet in Halpha

    > I did not get but one hour's worth of Ha for Thor but did assemble it into
    a

    I like that one Richard ... very reminiscent of a Tech Pan image.

    -- Marty

    Martin C Germano
    http://home.earthlink.net/~mcgermano
    mcgermano@earthlink.net



  9. #9
    George Normandin's Avatar
    George Normandin Guest

    Default Widefield North American Nebula/Pelican/IC5068 in [SII], Ha and [OIII]


    "Richard Crisp" <> wrote

    results

    That's a very interesting pair of images Richard! Have you tried
    'narrow-band' filters and a full spectrum Luminance image?

    For such wide-field images I think your image scale is just fine. I've
    used a ST-6 on an 80mm Brandon triplet and I'm happy with the results. You
    might get more resolution using the DRIZZLE method, but I'm not sure that it
    would matter much considering the fine results you already have.

    George Normandin



  10. #10
    Richard Crisp's Avatar
    Richard Crisp Guest

    Default Thor's Helmet in Halpha


    "Martin C Germano" <mcgermano@earthlink.net> wrote in message
    news:cGoKb.39044$Pg1.35975@newsread1.news.pas.eart hlink.net...
    into

    Thank you Marty, What a nice comment from the "king of Tech Pan". Let me
    tell you that you have been a guiding light in getting me interested in this
    hobby. I've seen your images for years and they were always pulling me to
    just do it. Finally in late 2000 I decided to buy a telescope and what a
    wonderful adventure it has been.

    Thank you very much for the comment. It means a lot to me.
    Best regards,
    Richard



 

 
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