Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Hello sketchers
Here are two sketches I made this summer on a nice dark place in France. I started in astronomy with a 7 cm refractor (Meade ETX-70). My first project was (of course) seeing all the Messiers. I have still one to go (M83)...
It took me one year to realise that it was impossible to see stars in a globular cluster with a 7 cm scope (even M13). I think I looked to much to APOD! The fact that I observe from light polluted areas (my home has a typical NELM of 4,5 mag, a 40 minutes drive take me to a 5,5 mag site) doesn't help much.
Great was my surprice when I looked to M4 in France (much higher in the sky than my hometown). I could see details! At low magnification (x10) M4 looked uniform round. But by higher magnification (x89 and x150) a central bar was visible. It looked like a backbone with different brighter knots.
M13 was also a mighty view. I could detect the globular with the naked eye and averted vision! At x89 and x150 there were individual stars visible at the edge of M13. The globular looked very granulated. At the edge of seeing stars in the globural.
All sketches are made on printing paper with a HB/2 pencil, scanned and inverted. Hope you like them.
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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and here is M13
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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TenthEnemy
sage
Reged: 01/21/08
Posts: 428
Loc: Maryland
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You've captured them both very well.
Just a few weeks ago I was shocked when I stopped my XT10 down to 80mm and could still see stars in M13. The whole cluster appeared as fine grains of sand with a few distinct point sources standing out. This was from an NELM of around five.
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Orion XT10
70mm refractor
12x50 binoculars
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asteroid7
Post Laureate
Reged: 10/19/04
Posts: 4238
Loc: CT
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Nicely done
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Clear Nights "Make My Day"
4.5" f/7 APM (TMB) APO Refractor CG5 GoTo with Orion extension tube
8" Celestron CPC (two)
Eyepieces:
40mm Pentax; 24mm Tele Vue Panoptic, 18mm Tele Vue Radian, 18mm HD Ortho, 15mm Celestron Omini,14mm Pentax,10mm Tele Vue Radian, 7mm,5mm & 3.5mm Nagler; 7.4mm Tele Vue Plossl.
2.5 Tele Vue Powermate
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lunartic65
sage
Reged: 12/26/06
Posts: 400
Loc: Dublin Ireland
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Lovely images Jeff.
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Paul
Four weddings and a funeral, where's the difference?
Al Bundy
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frank5817
Post Laureate
Reged: 06/13/06
Posts: 4084
Loc: Illinois
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Jeff,
Very nice sketches of these fine globular clusters. These are very challenging sketches to make and especially if they look as accurate as these two.   
Frank 
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my gallery
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CarlosEH
Post Laureate
Reged: 01/19/05
Posts: 4138
Loc: Pembroke Pines, Broward County...
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Jef,
Excellent observations of M4 and M13. You have captured both globular clusters very nicely. They do exhibit the appearance in your renderings at those magnifications. Thank you for sharing them with us all.
Carlos
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Kris.
Pooh-Bah
Reged: 09/16/04
Posts: 1276
Loc: Belgium
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great sketches Jef, a while ago i had the best view i've ever had of M13 thru my 12" with the bino. it was just like the pictures, better actually cause it looked really 3D. couldn't believe my eyes...
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Kris
To be old & wise, you first gotta be young & stupid
8" dob
AstroTech 66ED/APO
TAL 120 newt.
my CN sketch & picture gallery
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kraterkid
Post Laureate
Reged: 03/07/05
Posts: 4550
Loc: Jacumba, California
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Beautiful sketches Jeff, Wonderful renderings of these two obviously carefully observed globulars.  The central bar in M4 is a very cool capture, makes me wonder what produced that kind of pattern. Great job! 
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Rich
My CN Gallery
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Edwin Quiroga
professor emeritus
Reged: 01/31/08
Posts: 612
Loc: Miranda, Venezuela
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Did you see that detail in a 70mm scope? Yes, I confirm the awesome views that a little refracto yields from very dark sites. With my 85mm scope I have spotted G1, an extra-galactic Globular at 13.7 magnitude.
Very beautiful sketches!
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TeleVue 85 w/FeatherTouch
Televue Panoptic 35
Pentax XW (3.5, 5, 7, 10, 14, 20)
Pentax XO 2.58
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JayinUT
I'm not Sleepy
Reged: 09/19/08
Posts: 944
Loc: Utah
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Jef, terrific captures of M4 and M13. You nailed them I think given your magnification. Thank you for sharing them.
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Jay in Utah
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Location: Lat: 40.514N Long: -112.032W
Mortal as I am, I know that I am born for a day. But when I follow at my pleasure the serried multitude of the stars in their circular course, my feet no longer touch the earth.
— Ptolemy, c.150 AD
My Blog
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geminijk
member
Reged: 04/03/08
Posts: 87
Loc: TN
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I wish I had the patience to draw like that. Working towards it, your certainly encouraging all of us, and thanks for sharing.
I love the way M13 really shows the individual stars.
John
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Celestron Ultima 8 PEC w/GSO 9x50 RACI Finder
6" Meade ETX-LS
6" Orion Intelliscope Dob
http://twitter.com/geminijk
http://amateurastrotech.wordpress.com
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Jef De Wit
super member
Reged: 03/06/09
Posts: 123
Loc: Hove, Belgium
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Thanks to all for the kind words. It is indeed fun to push your telescope to the limit of what is possible. Normally I observer with a 12" dobson, but I Like observing with my 7 cm as well (like splitting the Double-Double or observering some tricky Messiers-galaxies).
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Clear skies, Jef De Wit
7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson
"Bright skies aren't empty skies" (James Mallaney)
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