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At long last...

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19 years 5 months ago #7442 by albertw
Replied by albertw on topic Re: At long last...
Strange that the tail isnt as obvious in the negative. Though on the original there is a hint of the second tail below the comet.

Cheers,
~Al

Albert White MSc FRAS
Chairperson, International Dark Sky Association - Irish Section
www.darksky.ie/

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19 years 5 months ago #7452 by Keith g
Replied by Keith g on topic Re:
James, those are 2 good shots :D
How do you use guidedog and dslr focus?, do you have to have a laptop with you? or, are these programs pre loaded into the camera?

Just some basic questions - but everybody has got to start somewhere :)

Keith..

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19 years 5 months ago #7454 by michaeloconnell
Replied by michaeloconnell on topic Re: At long last...
Superb images James!
Well done!

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19 years 5 months ago #7457 by James Butler
Replied by James Butler on topic Re:

How do you use guidedog and dslr focus?, do you have to have a laptop with you? or, are these programs pre loaded into the camera?

Keith,

I downloaded GuideDog from...

www.barkosoftware.com/GuideDog/

& DSLR focus is available from...

www.dslrfocus.com/

GuideDog is free and allows you to superimpose crosshairs on a live image from my LPI or other webcam. The software is ASCOM compliant and I can then send correction signals on a virtual joystick to nudge the scope in the right direction. You can set the sensitivity of the stick.

DSLR focus is a very powerful tool that I haven't bought yet as I have promised myself to stop spending money as a New Year's resolution (should last a week or two). It permits the user to accurately focus and operate the shutter on a Canon EOS300D. A simple mod for the EOS300D is a cable that connects from your parallel port to the shutter cable input on the camera that allows scheduled exposures to be controlled by the software. For now I shall construct a Hartman filter for the 300D and 200mm lens.

Hope that helps,

James Butler

Astronomy Diary - astronomy-diary.blogspot.com/

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19 years 5 months ago #7511 by James Butler
Replied by James Butler on topic Re: At long last...
Have had time to look at my star map and determine exactly where Macholz was when I photographed it. Here is an updated image with the designations of two prominent stars.



The comet was travelling approximately NE and would have passed close to the yellow star to the right of SAO 93590 three hours later according to AutoStar suite.

As mentioned by albertw there was another tail like elongation southwards.

I went back to the original and made a negative of the whole image. Here is a negative of the original photograph reduced to fit.



I could make out another jet towards 5 o'clock suggesting that both features are a bow shock.

Finally, here is a countour map of the negative and we see more clearly the comet's interaction with its environment.


James Butler

Astronomy Diary - astronomy-diary.blogspot.com/

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19 years 5 months ago #7547 by dave_lillis
Replied by dave_lillis on topic Re: At long last...
Great work there James,
you've fallen into a trap that I always fall/go into, :wink:
I just can stop processing those images, you can spend hours at it, entire days just messing around with different combinations just to see what comes out.

Its great, keep it up. :P

Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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