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  1. #1
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default NGC 752 - Open Cluster in Andromeda



    Dear group,

    Cat and mouse games last night with the partially-clouded skies and
    where I managed to capture NGC 752 in Andromeda. This particular
    cluster is very old for an open cluster (1.6 billion years-old) and
    spans 50' in apparent diameter. It is wel-populated and provides for a
    most impressive field of view.

    For a result based on two hours total exposure time, please see
    http://www.perseus.gr/Astro-DSO-NGC-0752.htm ... the image is
    hyperlinked and which leads to an even more impressive higher
    resolution version.

    Transparency this evening is so-so for now but I hope to pursue the
    Perseus Double Cluster around midnight when the skies are usually
    darkest.

    Anthony.

  2. #2
    Pierre Vandevenne's Avatar
    Pierre Vandevenne Guest

    Default NGC 752 - Open Cluster in Andromeda

    On Nov 12, 5:29 pm, Anthony Ayiomamitis <anth...@perseus.gr> wrote:


    Beautiful. I especially love the small galaxies. On my monitor (color
    calibrated), the image has a very light color cast. Auto color in PS
    seems to fix it. I set a few measure points on the background and the
    changes are really small, but worth it imho.

  3. #3
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default NGC 752 - Open Cluster in Andromeda

    On 12 ═´Ţ, 18:53, Pierre Vandevenne <pie...@datarescue.com> wrote:

    Pierre,

    I had a very slight greenish hue all over the image and which I went
    after using colour balance in PS. It is for this reason that is an
    ever slight clip on the green channel. If you have an alternate fix, I
    would love to hear about it since it is something I also noted and
    tried to fix.

    Thanks!

    Anthony.

  4. #4
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default NGC 752 - Open Cluster in Andromeda

    On 12 ═´Ţ, 18:53, Pierre Vandevenne <pie...@datarescue.com> wrote:

    Ooops ... you mentioned AUTO COLOUR ... okay, I will have a look.

    Thanks again!

    Anthony.

  5. #5
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default NGC 752 - Open Cluster in Andromeda

    On 12 ╬Ł╬┐╬*, 18:58, Anthony Ayiomamitis <anth...@perseus.gr> wrote:

    Pierre,

    I reprocessed the result from the beginning and I have loaded a new
    result. The background normalization is what caused my original
    problem and which I hope is now resolved.

    Thanks for the feedback.

    Anthony.

  6. #6
    Thomas Womack's Avatar
    Thomas Womack Guest

    Default NGC 752 - Open Cluster in Andromeda

    In article <ab1d1537-50a9-4266-a95f-16382f9049b1@m26g2000yqb.googlegroups.com>,
    Anthony Ayiomamitis <anthony@perseus.gr> wrote:

    That's very pretty.

    I know you put a thread across the aperture to get the 45-degree
    diffraction spikes (and in these colour images you can really see
    they're diffraction spikes, the colour dispersion along them is
    lovely), but the PSF looks as if there are also vertical spikes. They
    don't look like CCD blooming (go out in both directions and are still
    visible on quite faint stars), I'm curious as to what's producing
    them.

    Maybe I've been looking at too much Hubble imagery, but I wonder
    whether the thing to the right of the line between the two bright blue
    stars in the bottom left of the image is a galaxy cluster - some
    suspiciously fuzzy non-stellar objects and then a great concentration
    of small grey flecks.

    Tom

  7. #7
    Anthony Ayiomamitis's Avatar
    Anthony Ayiomamitis Guest

    Default NGC 752 - Open Cluster in Andromeda

    On 13 ═´Ţ, 13:53, Thomas Womack <twom...@chiark.greenend.org.uk>
    wrote:

    Hi Tom,

    The vertical spiking you are seeing is due to the microlensing feature
    on my ST-10XME and which boosts the overall sensitivity of the camera.
    In fact, for a number of these stars the blooming was quite visible
    and an eyesore. There are various pieces of software which address
    their handling and perhaps CCDStack has the best algorithm to this
    effect. However, it is not perfect as you see.

    With respect to the speckles near the bottom, I agree with you that
    they are galaxies. I checked various sources and I could only identify
    the two galaxies which I mention in the text preceding the photo. If
    you or anyone else has further information as to the identification
    (and magnitude) of these galaxies, I would be very much interested in
    learning of their identification.

    Thanks to everyone for the kind words surrounding this effort.

    Anthony.

  8. #8
    Pierre Vandevenne's Avatar
    Pierre Vandevenne Guest

    Default NGC 752 - Open Cluster in Andromeda

    On Nov 13, 2:13 pm, Anthony Ayiomamitis <anth...@perseus.gr> wrote:


    The most obvious one in the zone Tom talks about appears to be
    01:58:41.60 +37:42:50.0 - LEDA 7466 per Simbad. But not much info is
    available. There are a couple of others, unnamed in Simbad, but there
    is also V Zw 159 which apparently is a double 0.305 separation...

    using http://aladin.u-strasbg.fr/java/nph-aladin.pl

    In many cases, I find that faint fuzzy "possible elliptical galaxies"
    close to my limit of detection are in fact close double stars.

    I've lost quite a bit of time with unnamed galaxies. They don't appear
    to interest anyone, but I can't help being fascinated by them

 

 

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