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Error reading my FITS images   Message List  
Reply | Forward Message #676 of 683 |
Re: Artificial Star Question

--- In roddier@yahoogroups.com, "zeissnut" <grzincic@...> wrote:

>
> These are the higher-order aberrations or residuals after
> the other listed Zernikes are subtracted off. It will
> contain narrow zones, edge effects, bumps, holes, or
> anything else the software was not able to fit with the
> Zernikes. Its the stuff that is left-over. If the mirror
> has a rough figure, there might be some significant amount
> of these.
>

Dr. Biretta - thanks, I understand. Peculiar that I get a 0.02-0.04 Strehl
improvement by turning them off; the mirror shouldn't have much roughness (high
quality mirror from vendor with excellent reputation). I'll carefully
re-evaluate this effect on the next set of image pairs.

Mick Hollimon
10 June 09
6:14 PM PDT USA
Thu Jun 11, 2009 1:14 am

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m_hollimon
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Forward 		Message #676 of 683 |
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Hello Group, I am trying the Roddier software on images from my 13" F4 Newtonian. So far I get a crash when I try to open the images. Images are edited in... 		drgert1
Offline Send Email 		May 14, 2009
4:48 am

... Gert - I suggest downloading IRIS (freeware) and, after processing and saving (presumably as .FIT) in AstroArt, load into IRIS and immediately save as...
m_hollimon
Offline Send Email 		May 16, 2009
1:52 am

Group - here is a hopefully interesting question for the collective wisdom: Background: I have been actively considering the construction of an "indoor...
m_hollimon
Offline Send Email 		Jun 6, 2009
10:26 pm

Hi, Keeping in mind that I haven't done anything with Roddier : - Can the 2120 be set up on something like Polaris and have it's SA characterized by Roddier?...
Matt Considine
mconsidine_1999
Offline Send Email 		Jun 6, 2009
10:53 pm

... From: m_hollimon To: roddier@yahoogroups.com Sent: Saturday, June 06, 2009 6:26 PM Subject: [roddier] Artificial Star Question Group - here is a hopefully...
Ron Watson
ronald_watson@...
Send Email 		Jun 6, 2009
11:12 pm

Hi Mick, This is a very good question. I have done alot of visual star testing and some Roddier in this mode using a scope as a collimator to provide an...
zeissnut
Offline Send Email 		Jun 7, 2009
12:03 am

... Dr. Biretta - it's certainly good to hear from you again; hope the WFPC3 begins to work well soon. Of course I was much afraid the above would be the...
m_hollimon
Offline Send Email 		Jun 7, 2009
8:47 pm

... Hi Mick, First, I have enjoyed reading your posts over the months detailing your experience with Roddier. John Biretta and I often observe together and...
Paul Leuba
ngc891_2003
Offline Send Email 		Jun 9, 2009
2:07 am

... Mr. Leuba - thanks much for the encouragement. The impetus in all this is not to attack or demean Roddier but to try to get Roddier and interferometry to...
m_hollimon
Offline Send Email 		Jun 9, 2009
6:03 pm

... Hi Mick, I tried to get a quick look at your earlier results on SA. One interesting item I noticed is that Roddier and your interferometry seem to roughly...
zeissnut
Offline Send Email 		Jun 10, 2009
12:09 am

... Dr. Biretta - thanks much for the examination of some of the previous test results. I am going to carefully re-examine the later test stuff (T6, T7, T8)...
m_hollimon
Offline Send Email 		Jun 10, 2009
1:27 am

Hi Mick, ... I had just looked at the first of the T6 results you had. If I isolate the spherical term, using the check boxes in Roddier 0.4 / Front d'onde /...
zeissnut
Offline Send Email 		Jun 10, 2009
7:04 pm

... Dr. Biretta - thanks again for the quick look. Armed with improved insights (as a result of your quick look at T6/0DegA), I reexamined said image pair...
m_hollimon
Offline Send Email 		Jun 10, 2009
10:51 pm

Dr. Biretta - in all the blather of post #673 I completely forgot to ask an important question: In the table of Zernike coefficients from Roddier, the bottom...
m_hollimon
Offline Send Email 		Jun 10, 2009
11:33 pm

... These are the higher-order aberrations or residuals after the other listed Zernikes are subtracted off. It will contain narrow zones, edge effects, bumps,...
zeissnut
Offline Send Email 		Jun 10, 2009
11:55 pm

... Dr. Biretta - thanks, I understand. Peculiar that I get a 0.02-0.04 Strehl improvement by turning them off; the mirror shouldn't have much roughness...
m_hollimon
Offline Send Email 		Jun 11, 2009
1:14 am

Dr. Biretta/Group - A careful further examination of the data in the comparison table of post # 673, plus some investigation into how the performance numbers...
m_hollimon
Offline Send Email 		Jun 12, 2009
3:54 am

Hi Mick, I'm trying to follow along the numbers in these recent posts. Couple random questions.... So you are doing interferometry at the radius of curvature,...
zeissnut
Offline Send Email 		Jun 12, 2009
10:28 pm

... Dr. Biretta - sorry for any confusion about some of these details. All the Zernike coefficients displayed by OpenFringe are normalized,i.e., an error...
m_hollimon
Offline Send Email 		Jun 13, 2009
4:42 pm

... The above mods have been completed and a set of Roddier images (Test 9) obtained and analyzed using Vega as the target star. ... A "fanatically careful"...
m_hollimon
Offline Send Email 		Jul 21, 2009
8:12 pm

Only a point. I used Vega last year for Roddier test of a Klevstov-Cassegrain (TAL 250K). In my conclusion, it's too bright for a correct testing (I also...
Oscar González Re...
ogrydc
Offline Send Email 		Sep 1, 2009
3:08 pm

... Oscar - an interesting point. Seems like this effect would also modify results for refractors but they generally test closer to expectations. Curious. I...
m_hollimon
Offline Send Email 		Sep 1, 2009
8:08 pm

Group - in post #680 I raised two questions about the interaction between camera sensor chip orientation and Roddier analysis results. I have so far found no...
m_hollimon
Offline Send Email 		Sep 16, 2009
1:14 am
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