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Double Star Photos with the TEC 200

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#1 Cotts

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Posted 22 May 2013 - 01:56 PM

I thought about sticking these in the DSLR photography forum but - too bad for them!!!

Four double stars imaged with the TEC 200mm Mak/Cass at prime focus (3100mm) and a Canon 60Da in movie mode, 640x480crop, ISO400. Each movie was about 45sec. to 1 minute long in moderate seeing - 2 or 3 out of 5 at the Texas star party.

I used LYNKEOS aligning and stacking software which runs natively on my MacBook. After aligning the frames I selected the best 100 or so frames for stacking. No other processing was done.

I think the results are encouraging....

First, Mizar, (Zeta UMa), Mags 2.06 and 3.95, sep 14", PA 150 deg.


Alright, get on with it, Cotts!!!!

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#2 Cotts

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Posted 22 May 2013 - 01:58 PM

Now Izar, quite a bit closer and more difficult...

Mags 2.26 and 4.65, Sep. 2.6", PA 163

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#3 Cotts

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Posted 22 May 2013 - 02:01 PM

How about Lambda Oph!?!

Mags 4.16 and 5.22, Sep 1.4", PA 40deg

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#4 Cotts

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Posted 22 May 2013 - 02:03 PM

Last one, Xi Sco AB

Mags 4.15 and 6.56, Sep 1.0", PA 1deg

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#5 Cotts

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Posted 22 May 2013 - 02:07 PM

I'm pretty sure the image scale is the same in each case but the PA/orientations are all over the place because I was altering imaging with visual observation and I took no care to have the camera on the same way each time.

The Xi Sco shot was taken at an altitude of 30 degrees so there is some chromatic dispersion seen....

Thanks for looking.

Dave

#6 R Botero

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Posted 22 May 2013 - 04:57 PM

Great shots Dave. :cool: Colours are very nice also. Thanks for sharing.

Roberto

#7 Ed Wiley

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Posted 23 May 2013 - 10:09 AM

Great shots Dave. I assume these are from the TSP. If so, they are all the more impressive as seeing was not that great. Your TEC is a great double star scope. :jump:

Ed

#8 Cotts

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Posted 24 May 2013 - 02:58 PM

Hi, Ed. Yes these were the ones from TSP. I have your voice on the original videos to prove it.....

My observatory in Toronto is 99% ready to go. I have to wait for a clear night to do a polar align, including drift.

Next are the magnitude versus ISO speed tests to see my magnitude limit with the 60Da.

Question: I can use REDUC in the comfort of my living room by loading the videos in after the fact, can't I?

Dave

#9 Ed Wiley

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Posted 24 May 2013 - 05:35 PM

Hi Dave:

I am not sure about video conversion from a 60Da. My DMK21 requires conversion using Veedub64 into *bmp frames before I load them into REDUC. I think the kinds of video you can directly input into REDUC is limited by Florent's desire not to spend all his time trying to keep up with changing video formats. So...you will have to investigate.

Glad to hear your observatory is almost finished. I am still dealing with all the data I collected at the TSP. Its a fun sort of "dealing." My 0.6" pairs are not quite separated enough for good measures, I need to go to F50.

Clear skies and good measures to you!

Ed

#10 WRAK

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Posted 25 May 2013 - 04:42 PM

Dave, would hate "my" bad weather even more if I had such a great scope available. Hope you use it also for visual observing, seems kind of waste to use it for astrophotography.
Wilfried

#11 Cotts

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Posted 25 May 2013 - 10:32 PM

Well, Wilfried, the videography/photography is intended to measure the separation of double stars for eventual publication in a scientific journal. Not exactly wasted.....

I'll still do some visual observing of double stars from the city with the TEC as well as with the 16" Teeter when I am under dark skies.

Dave

#12 WRAK

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Posted 26 May 2013 - 05:24 AM

Excuse the improper wording - any activities to eliminate errors in the WDS catalogue are highly appreciated. I try to contribute with rather unscientific reports on crass magnitude errors.
I just misinterpreted "TEC 200" for the APO and assumed that while high quality refractors are top choice for visual observing there are better alternatives for astrophotography costing less - but now I see that you use anyway a Mak. Sorry for this misunderstanding and congratulations to your excellent images.
Wilfried

#13 Scott in NC

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Posted 26 May 2013 - 10:08 PM

Nice pics, Dave--thanks for sharing them! :waytogo:

#14 Asbytec

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Posted 26 May 2013 - 11:51 PM

Dave, I'm happy for you. Nice scope.

#15 Ed Wiley

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Posted 27 May 2013 - 10:28 AM

Dave:

I was so hung up on the video format question, I forgot the rest. Here is what I do.

1. Capture the video (since I use a computer its on the hard drive).
2. Backup the video on a portable HD
3. Transfer the video to the desktop HD.
4. Analyze the images at home, beer optional.
5. Erase the images from the laptop, keeping duplicate copies on the portable HD and the desktop HD.
6. One published I keep an archive copy of the video only to save space.

One other thing, I would get a battery adapter so you can run all night.

Good measures, Ed






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