My effort for the day

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My effort for the day

Postby andrewscomputers » Mon May 09, 2016 7:17 pm

HI everyone this is one of my images of the Mercury transit today.Hope you enjoy.
Andy :D
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Re: My effort for the day

Postby Aratus » Mon May 09, 2016 8:59 pm

Well, you certainly got the transit of Mercury in the bag! Congratulations.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
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Re: My effort for the day

Postby andrewscomputers » Mon May 09, 2016 9:36 pm

HI Aratus thanks for the reply here is an image of a sunspot you mentioned, modified in colour.
Thanks
Andy
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20m2.jpg
sunspot
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Re: My effort for the day

Postby Aratus » Mon May 09, 2016 9:52 pm

That focus is really sharp! Did you put your head in a cardboard box! :D

Focus is (nearly) everything with these photos. The exposure is just right too.

Yes, that is the long lived sunspot!
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
Aratus
 
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Location: East Lincolnshire

Re: My effort for the day

Postby andrewscomputers » Mon May 09, 2016 10:02 pm

Hi Aratus yes I put my head in a cardboard box on the table with my laptop inside and two towels one on top,one on bottom to make it darker seem to work well as the sun was really bright.I have processed
another image of mercury just coming onto the sun. :D
Andy
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Re: My effort for the day

Postby Aratus » Tue May 10, 2016 12:04 pm

That was a good shot - and again nice and sharp. A shorter exposure would have brought out more detail on the rest of the sun, but the limb is fine.

I'm pleased the old 'cardboard box' trick worked. You might get some funny comments from the neighbours though! :D Being in the observatory gives quite a bit of protection from stray light on the computer screen, but even then I had to lower the aperture lid halfway to reduce it sufficiently to see it properly.

It wasn't all plain sailing. I was panicking that I might have mis-calculated the position on the sun's limb where Mercury would appear. Also less than 1 minute before it was due, the telescope tracking suddenly veered off. :o (Occasionally the gears slack or tighten causing tracking errors.) Fortunately I was able to bring it back in time. The tracking then stayed true for the next 5 hours!
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
Aratus
 
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Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire

Re: My effort for the day

Postby andrewscomputers » Tue May 10, 2016 1:17 pm

Hi Aratus I had to track my manually as I have no motorized system on my eq5 tripod so I had to adjust just the one knob and worked quite well.I kept the tripods legs low for stability and once I got focused locked the screw to keep in position on the eyepiece for the camera.I am lucky I am not overlooked by neighbours in my garden it is well secluded from them.
Andy
andrewscomputers
 
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Re: My effort for the day

Postby Aratus » Tue May 10, 2016 6:29 pm

For something like this automatic tracking isn't really needed, although it is essential if you need to leave the set up to automatically take exposures. On those occasions the EOS-BY software I use can pause for a set number of seconds, and then take a set of exposures. You tell it how many times to go through that loop. So at lunchtime I told it to take 50 exposures every 300 seconds - 12 times. That give me 12 exposures every 5 minutes for an hour without having to be there.

It is a sobering thought that if the transit had been today I wouldn't have seen any of it. Cloud and rain all day! :(

btw The next transit of Mercury is on 11th Nov 2019.
I use an 11" Celestron SCT (CPC 1100) on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI1600MC and Canon 500D for imaging.
Aratus
 
Posts: 807
Joined: Tue Jan 12, 2016 2:17 pm
Location: East Lincolnshire


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