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Thread: Star hopping instruction for M7

  1. #1
    Harshil Patel's Avatar
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    Default Star hopping instruction for M7



    Hello friends,
    By using this steps you can easily find
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    7 using you binocular as well as your
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    .

    Messier 7 is open star cluster, it is also known as
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    or
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    . It is deep space object which we can find in
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    in southern hemisphere between mid to late summer.

    How to find M7 in the night sky?

    To easily find out messier 7 in the sky first of all find out the scorpius constellation using star chart in which you will find the the brightest star named Antares ( red super giant). After finding the Antares go below or at the end of the constellation mean at the tail of the constellation here you will find
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    which is known as λ-sco or Shaula. Now go exactly top left to that double star you will be able to see messier 7. and if you go in upward direction of M7 you can find out M6(Butterfly cluster).


    Star chart :
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    Thank you

    Harshil
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  3. #2
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    Default Re: Star hopping instruction for M7

    Thanks, Harshil! Good instructions.

    M7 is indeed a fine cluster to observe, rather magical in my opinion. Looking forward to some pleasant summer viewing in
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    and
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    .
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    Bryan

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    Default Re: Star hopping instruction for M7

    WOOHOO!
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    M7!
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    M7 is one of the most "quietly spoken, but carry a BIG stick" objects in the whole sky!

    It contains a treasure trove of objects in and around it to satisfy binoculars through to the largest of
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    .

    M7 sits within a stone's throw of the densest star cloud in the entire sky, The Cloud of
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    . Being in the vicinity of the single busiest and most crowded areas of the sky, if one keeps the magnification way down low, say with binos or with a Rich Field
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    (RFS), and incredible network of dark
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    can be seen around and cutting into M7! This very vision of M7 is one that is highest on my "to sketch list". Forget my 17.5" dob here. This is the domain of SMALL apertures! Busy yourself entirely with slow focal ratios and larger apertures, and this richness of the surrounding
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    is totally lost to you!

    This NASA APOD image shows exactly what I am talking about:


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    It doesn't stop there. The area that M7 occupies is enormous, and sitting in such a busy area of the sky, is it any wonder that there are close to a dozen separate deep sky objects within its line of sight direction! There are other multiple open clusters, planetary nebulae and even a
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    that call M7's boundary home!

    The chart below shows a smaller boundary to M7 than most other charts do, but it demonstrates how much stuff lies inside and immediately around it:


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    I love scanning M7 with my big dob. It is so rich, so densely populated, that it is joy to track down the various other objects. The open clusters all have their own characters and so different from that of M7. Because of the heavy amount of interstellar dust that fills this space, many of these "smaller" clusters have a reddish hue to them. And the globular cluster NGC 6453 I use as a
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    piece object to help me determine the
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    of the sky. How easily or not I can spot this difficult to see GC is a great gauge. 6453 is not only heavily obscured by dust, but it is also very remote. I believe I can just begin to resolve just a handful of its stars in my 17.5" scope, and these are all using
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    .

    The planetary nebulae here are all tiny, "suck your eyeballs out of your head" tiny. The only way to spot them is using the Blinking method, similar to how Tombaugh found Pluto. By using a blinking paddle, you are able to swap with the flick of the wrist between a neat image of M7 through the
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    to one with an OIII filter, and flick swap neat again. The paddle allows you to slip the OIII filter between your eye and the eye lens of the eyepiece quickly and easily. You do need an EP with a generous amount of eye relief to do this successfully though. By Blinking this way, those tiny, tiny PNs all of a sudden POP out from the background noise of the Milky Way. Once you see this for the first time, it really is quite and extraordinary effect!
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    We are all too ready to ignore M7 once we've pinged it in our early days of DSO hunting. But man-oh-man, what a mistake it is to so frivolously dismiss M7 this way, when it holds such an immense treasure trove of riches for our eyes!

    Alex.

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    Default Re: Star hopping instruction for M7

    Dang, Alex. Now I gotta see M7 again. I have 3 logged observations of it.

    14 March 2015:

    90. M7 -
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    in
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    - This one was a slide down from M6. This open cluster was very nice in the FOV, widely spread out (and right above the tree tops), about 17 brighter stars, with evident smaller stars scattered within. This cluster was about 9° above the horizon. Also about 20 other stars scattered around the core.

    29 March 2015:

    M7 - A wonderful open cluster, excellent target in wide field binocular view.

    19 July 2015:

    9. Ptolemy's Cluster -
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    7 - Open Cluster in Scorpius - Good ol' M7. Wow!
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    everywhere, filling the field of view. I spent a long time on this cluster, wondering at all of those tiny little suns out there merrily burning away, oblivious to our Earthly tribulations. Such vast distances between each, and from our corner of the galaxy. What worlds swing around these stars, bound by their gravitational tethers? What eyes blink into glass from these worlds, contemplating our small yellow dwarf star?

    So yeah, it has been a good long while. I will definitely make plans to revisit this summer. Thanks for the inspiring post!
    Bryan

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    Default Re: Star hopping instruction for M7


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    That's a great article...Thank you for sharing more information about m7 with skychart and image..
    Harshil.

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    Default Re: Star hopping instruction for M7

    I should say that I have two sketches I want to do of M7: one with an RFS and the other with my 17.5" dob. Both visions are tremendously different to each other. The piece using the big dobbie will be a blooming BIG sketch, and A4 sheet just won't do. A3 maybe, but it will be cramped - you just cannot limit the piece just to the cluster, I really believe one needs to add some of the object's neighbourhood for better context. Might need to pull out the big one and go A2 like I am with the LMC.

    M7 also goes right over
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    for me here in Oz. Blooming marvellous!
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    Alex.

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    Default Re: Star hopping instruction for M7

    Nice article, I really admire the amateur astronomer that has the patients ( And the talent ) to star hop to a destination.. I don't,, Thank god for
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    ... I love this hobby but if it weren't for the computer controlled
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    , I would not be in it..

    I guess I am what you might call, a lazy astronomer...

    djl
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    Default Re: Star hopping instruction for M7


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    Originally Posted by BMR528
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    Nice article, I really admire the amateur astronomer that has the patients ( And the talent ) to star hop to a destination.. I don't,, Thank god for
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    ... I love this hobby but if it weren't for the computer controlled
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    , I would not be in it..

    I guess I am what you might call, a lazy astronomer...

    djl
    Consider star-hopping as a hobby on its on. With goto you are in a back seat of a taxi with shades down, just waiting to arrive to destination (and nothing wrong with that
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    ). When star-hopping with manual mount you are in the driver sit enjoying scenic route and admiring landmarks on the way. I would not even see many on DSOs, doubles or carbon stars if I was not star-hopping past by in a route to a
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    or Herschel list target.

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    Default Re: Star hopping instruction for M7

    Thanks for the directions Harshil.
    That should come in handy. I've been eyeing the Ptolemy for next excursion to a dark site.
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    Default Re: Star hopping instruction for M7

    Thanks for the article Harshil and also thanks to Alex to enhance the information about M7.
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    路易斯 LG
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