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Astrophotography and Sketching >> Sketching

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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
A globular with spiral structure?
      #5341172 - 07/29/12 05:37 AM Attachment (105 downloads)

We had some clear nights in Belgium. I sketched some asterisms and one globular cluster.

Lord Rosse saw spiral structure in M92 (the other globular cluster in Hercules). I could dedect only one "spiral arm": a nice row of stars starting from the south side and curving to the east side.
12" @ x240, FOV +/- 20', SQM 19.2


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: A globular with spiral structure? new [Re: Jef De Wit]
      #5341175 - 07/29/12 05:43 AM Attachment (71 downloads)

Of the six asterism I sketched, this one was the nicest. Poskus 1 is a small but fine asterism that looks like a fly swatter. It is situated 10' northwest from the nice double Gamma Delphinus. Both objects are a beautiful sight. Check it out!
12" @ x92, FOV +/- 40', SQM 19.0, not all field stars are sketched


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curiosidad
sage


Reged: 06/09/11

Re: A globular with spiral structure? new [Re: Jef De Wit]
      #5341196 - 07/29/12 06:22 AM

You are an Artist!

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maroubra_boy
Vendor - Gondwana Telescopes


Reged: 09/08/09

Loc: Sydney, Australia
Re: A globular with spiral structure? new [Re: curiosidad]
      #5341224 - 07/29/12 07:14 AM

What a lovely quirky signature feature you've noted Jef. I love picking out these special features in globulars. Give each GC its own unique charateristics.

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Ed D
Carpal Tunnel
*****

Reged: 04/30/10

Loc: Sunny South Florida
Re: A globular with spiral structure? new [Re: maroubra_boy]
      #5341310 - 07/29/12 08:53 AM

Two very nicely done sketches. I also learned something new about M92. Thanks!!!

Ed D


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frank5817
Postmaster
*****

Reged: 06/13/06

Loc: Illinois
Re: A globular with spiral structure? new [Re: Ed D]
      #5341556 - 07/29/12 12:24 PM

Jef, Very fine sketch of M92 and the fly swatter, I CAN SEE IT-COOL!

Frank


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Rutilus
Carpal Tunnel


Reged: 12/17/10

Re: A globular with spiral structure? new [Re: frank5817]
      #5341813 - 07/29/12 03:10 PM

Excellent work Jef.

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GlennLeDrew
Postmaster
*****

Reged: 06/18/08

Loc: Ottawa, Ontario, Canada
Re: A globular with spiral structure? new [Re: Rutilus]
      #5341996 - 07/29/12 04:57 PM

To address the question posed in the title, it is of course impossible for a globular--or any cluster--to posses any kind of spiral structure. By their nature, the orbits of the member stars are randomly oriented, with the whole population very quickly well mixed. Any apparent alignments would be transitory, and certainly not coherent in the third dimension. And of course, the visual system is quite adept at picking out such alignments, as though it were a fundamental characteristic to discern organized patterns.

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niteskystargazer
Carpal Tunnel
*****

Reged: 10/05/09

Loc: 41-43'-28" N 87-42'-39" W
Re: A globular with spiral structure? new [Re: Jef De Wit]
      #5342035 - 07/29/12 05:19 PM

Jef,

Very good sketch of M-92 .

CS,KLU,

,

Tom


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JeanB
Pooh-Bah


Reged: 07/11/11

Loc: Montreal, Canada
Re: A globular with spiral structure? new [Re: niteskystargazer]
      #5342524 - 07/29/12 10:41 PM

Jef,

you are at the top of your art!!!

Jean


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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: A globular with spiral structure? new [Re: JeanB]
      #5343313 - 07/30/12 12:20 PM

Thanks you guys for the nice comments.
Thanks Glenn, for the astrophysics.


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mike73
super member


Reged: 05/01/12

Loc: UK Plymouth
Re: A globular with spiral structure? new [Re: Jef De Wit]
      #5344610 - 07/31/12 02:48 AM

Very tidy sketches Jef and I really like how you picked out the asterism in M92.
I've been reading Stephen O'Meara's Messier Objects and he does exactly the same. When you really look all globulars are very different.


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Mizar76
member


Reged: 01/07/11

Loc: Rome, Italy
Re: A globular with spiral structure? new [Re: mike73]
      #5346452 - 08/01/12 05:49 AM

Very very nice work Jef!
Compliments!!!
Stefano


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observing1
sage


Reged: 03/22/11

Re: A globular with spiral structure? new [Re: Mizar76]
      #5347595 - 08/01/12 07:59 PM

I went to an astronomy tour in Arizona, and looked through a pro's telescope at M3, which is a globular. I was very convinced it looked spiral, but everyone told me globular clusters can't be spiral. I'm stumped too.

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Jef De Wit
Carpal Tunnel


Reged: 03/06/09

Loc: Hove, Belgium
Re: A globular with spiral structure? new [Re: observing1]
      #5348193 - 08/02/12 05:36 AM

Mike & Stefano:

@ observing1: I never looked at M3 with a big scope, but will keep it in mind for a next visite.


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phily
sage


Reged: 12/18/04

Loc: Kent, UK
Re: A globular with spiral structure? new [Re: Jef De Wit]
      #5358214 - 08/08/12 02:52 PM

Very interesting sketch, very nicely done. Lovely clear sky!
Phil


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geminijk
scholastic sledgehammer


Reged: 04/03/08

Loc: TN
Re: A globular with spiral structure? new [Re: phily]
      #5362759 - 08/11/12 01:04 AM

Beautiful sketches! I never noticed it with M92, but M5 always sees to remind me of a spiral.

John


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: A globular with spiral structure? new [Re: geminijk]
      #5362889 - 08/11/12 05:59 AM

Jef.

Well, you just me curious to see both now. I never remarked any spiral looking effect in M92, but for sure I'll pay more attention next time. And your second asterism is very interesting. The double star look very interesting too. I have to check that.

Thanks for sharing. Beautiful sketches.

Andre.


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Andrev
Post Laureate
*****

Reged: 02/08/11

Loc: Montreal, Quebec, Canada
Re: A globular with spiral structure? new [Re: Andrev]
      #5363393 - 08/11/12 01:58 PM

Jef.

I'm trying to find the Delphinus in Sky Tools and I can't see it ??? Very strange. You said you FOV is 40' as shown on the picture ? Which range of mangitude are the stars ?

Andre.


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mdowns
Carpal Tunnel
*****

Reged: 06/12/10

Loc: Englewood,FL
Re: A globular with spiral structure? new [Re: Jef De Wit]
      #5363567 - 08/11/12 04:26 PM Attachment (31 downloads)

Jef De Wit
It took me forever to find this scetch I did 30 years ago with a 10" dob about 20 miles east of Indianapolis. Interestingly the stars in my field look very different than yours.Maybe I mislabled this one but I think I was very sensitive to yellow stars.I recall my observing buddy always saying that a star I said was bright would seem faint to him. Nonetheless I do show a curving arc of stars that might be thought of as a portion of a spiral.


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