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Lawrence Parchman

Sculptor Galaxy (NGC 253)

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Posts Made By: dan kowall

July 14, 2010 10:51 PM Forum: CCD Imaging and Processing/Deep Sky

TEC 140 imaging setup

Posted By dan kowall
I'm thinking that setup should keep you happy for a while, Floyd.

dan kowall

July 22, 2010 03:53 PM Forum: CCD Imaging and Processing/Solar System

Jupiter with a 10" Mak

Posted By dan kowall
That's nicely processed, Rolando.
My regards,

dan

July 30, 2010 01:52 AM Forum: CCD Imaging and Processing/Deep Sky

Abel 71

Posted By dan kowall
Roland,
I've always seen that Abell object imaged at longer focal lengths. Seeing it in the context of your widefield image gives it a new perspective.
I barely recognized it.
Your new scope eats up the sky in big bites.
My regards,

dan kowall

August 4, 2010 02:13 PM Forum: CCD Imaging and Processing/Deep Sky

First light - NGC 6888 in Ha

Posted By dan kowall
The link doesn't work for me.

dan

August 31, 2010 02:58 PM Forum: CCD Imaging and Processing/Deep Sky

SH2-155 The Cave.

Posted By dan kowall
That's an interesting field, Jim, nicely framed.

dan

September 7, 2010 03:45 PM Forum: CCD Imaging and Processing/Deep Sky

Not your usual Iris

Posted By dan kowall
Well, Tom, your 'usual' is someone else's career image.
The coloring in the dust is superb.
Once again, the Dust Buster is the Best Duster out there.
Did the presence of diffraction spikes from the ASA image cause you any difficulties?
My best regards,

dan

September 15, 2010 02:09 PM Forum: CCD Imaging and Processing/Deep Sky

The Blue Tree

Posted By dan kowall
Excellent work, Tom.
I cringe whenever I see the Pleiades presented as only blue with a clipped, black background. It is, in fact, much more than that as you have shown.
Most of us have to suffer bright star reflections with this target.
How did you manage to get such a 'clean' image?
My regards,

dan

September 15, 2010 06:46 PM Forum: CCD Imaging and Processing/Deep Sky

Bubblelicious

Posted By dan kowall
Roland Christen said:
...... can you spot the camera defects in this image and identify where they came from?

There are some odd radial flares on the bright stars in the corners.
The bottom 1/6 of the image looks 'noisier' than the rest of the image (readout error?).
The outer part of the brightest stars in the image show the dark V-shaped pincers that one often sees with the FSQ 106 (though I'm thinking that's not a camera defect. Lens spacers?)
That's a wonderful field of view for the Bubble.

dan kowall

October 5, 2010 06:08 PM Forum: Home Observatories

Pack sand?

Posted By dan kowall
Steve Hollenbach said:
...... If you slap the side of an empty pipe (and who doesn't from time to time) you get a nice musical note like a bell ringing. That's certainly not what you need for a mount for a telescope.....

Why not?
When using your mount do you hit the pier hard enough to make it ring?
Does the wind blow hard enough to make pier ring and sing?
I know there are people who go to great lengths to make their piers stop ringing, but why? Of course any metallic cylinder will have a resonant frequency, but does this ever affect the stability of a pier? Has anyone ever had an image ruined by a resonating pier?
At the risk of saying the emperor has no clothes, I will answer "No".
If you want to make a stable pier, the most important things are the diameter of the pier, the presence of gussets, and a solid connection to an immovable mass in the ground.
It sure seems like getting into a tither about a pier ringing when you hit it with a hammer is a solution in search of a problem.
Of course any man should be free to choose his goals, I just think that you're tilting at windmills with this one.

dan

October 11, 2010 04:59 PM Forum: CCD Imaging and Processing/Deep Sky

NGC 281

Posted By dan kowall
Nice integration of the Ha data, Maciej.
My regards,

dan

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