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rodelaet
Post Laureate
Reged: 04/28/06
Posts: 3063
Loc: 50°56' N - 4°58' E (Belgium)
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A low power binocular can sometimes frame two or more objects in one field of view. These wide fields can provide very rewarding observations. Such is the case with IC 4756 in Serpens Cauda and NGC 6633 in Ophiuchus. According to my sky charts they have an angular distance of only 3°. Starting point for this query is Theta Serpentis. Point your binoculars halfway between Zeta and Lambda Aquilae. There you’ll find the 4th magnitude Zeta Serpentis. Now move the binoculars 4° to the west and a little to the north until the soft glow of IC 4756 shows up. IC 4756 can be tricky to see at first. Just move the binoculars another 3° along the same direction until NGC 6633 comes into view. NGC 6633 is the most conspicuous but also the smallest of the duo. Four brighter stars are embedded in an elongated haze of fainter cluster members. Now that you have identified NGC 6633, look for the large pale glow of IC 4756. This cluster measures almost a full degree across. My 8x56 binoculars show many 9th and 10th magnitudes pinpricks framed by a few brighter stars. The cluster comes best into its own with averted vision. Then IC 4756 looks like a faint cloud of diamond dust. With both clusters in the same field of view, it is interesting to compare them. NGC 6633 is the more condensed cluster of the two. IC 4756 is believed to measure 20 light years across at a distance of 1300 light years. NGC 6633 is 1000 light years away from us.
Site : Bütgenbach, Belgium
Date : June 29, 2008
Time : around 00.30UT
Binoculars : Bresser 8x56
FOV: 5.9°
Filter : none
Mount : Trico Machine Sky Window
Seeing : 2,5/5
Transp. : 4/5
Nelm : around 5.9
Sketch Orientation : N up, W right.
Digital sketch made with Photo Paint, based on a raw pencil sketch.
(Note: if the sketch does look too dark on your monitor, try to darken the room.)
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Rony
My Astronomical Sketches
My Binocular Sketches
Callibrate your Monitor with this little strip.
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 4084
Loc: Illinois
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Rony,
Great sketching. Nobody but nobody does this better than you guy.   
Frank 
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my gallery
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rolandlinda3
Carpal Tunnel
Reged: 01/24/06
Posts: 2233
Loc: Crozet VA 22932
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Really nice sketch and lots of work (in my mind if I did it...it is really a lot). I like the detail in your star fields as well as the nebulosity you capture.
Rony, I note you have Bresser 8x56 and use them a lot. We got an inexpensive 8x56 in order to get a little more light to our older eyes rather than use the popular 40- or 42-mm candidates. I will be interested to see how they do. I had forgotten that is what you work with so I am hopeful.
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Roland
Sketches in members galleries: rolandlinda3
Inspirational stories/sketches at:
www.christworksministries.org
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rodelaet
Post Laureate
Reged: 04/28/06
Posts: 3063
Loc: 50°56' N - 4°58' E (Belgium)
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Frank,
Thanks! Glad that you like the sketches. 
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Rony
My Astronomical Sketches
My Binocular Sketches
Callibrate your Monitor with this little strip.
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rodelaet
Post Laureate
Reged: 04/28/06
Posts: 3063
Loc: 50°56' N - 4°58' E (Belgium)
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Roland,
Thank you for the kind words.
I hope you'll enjoy those 8x56. Keep us updated, OK?
BTW, I just ordered a pair of 15x70. Funny how our roads cross again, don't you think?
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Rony
My Astronomical Sketches
My Binocular Sketches
Callibrate your Monitor with this little strip.
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 4138
Loc: Pembroke Pines, Broward County...
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Rony,
A beautiful observation of two interesting open clusters in Serpens Cauda (IC 4756) and Ophiuchus (NGC 6633). Both of these clusters appear to shine in your rendering. You are a true master of the deep sky field. Your binoculars (and telescopes) have opened the skies for us all. Thank you for sharing them with us all.
Links;
http://seds.lpl.arizona.edu/messier/Xtra/ngc/n6633.html
http://www.backyard-astro.com/deepsky/2003_09_26/NGC_IC4756.gif
http://www.allthesky.com/clusters/ngc6633ic4756.html
http://www.astrored.org/astrofotos/d/7750-1/ngc6633ic4756-b.jpg
Carlos
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rodelaet
Post Laureate
Reged: 04/28/06
Posts: 3063
Loc: 50°56' N - 4°58' E (Belgium)
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Carlos,
That's very kind of you.
I am comparing these links with my observations. The last link is my favorite to compare with. It is a good example of showing the small stars in the picture which I observe as unresolved starlight in the bino's.
I hope to see your sketches soon again!
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Rony
My Astronomical Sketches
My Binocular Sketches
Callibrate your Monitor with this little strip.
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