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Night Sky with A810

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Offline Davo

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Night Sky with A810
« on: 16 / January / 2013, 11:28:57 »
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Hi,

I just got my new A810 working with CHDK and I thought I would try it out on the night sky. I was mighty impressed that I could get the results I got from a £50 unit.

Here is a portion of my first star shot showing Orion. It was created by stacking 10x 5s raw exposures recorded with the built-in Canon intervalometer. You can see a moving object as a line of 10 dots just above the 3 stars of Orion's belt. I am still investigating what it was.

My plan is to write a script that I can use to automatically record several hours worth of start shots. Hopefully, I should get some meteors, satellites and who knows what else.

Dave
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Offline Microfunguy

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Re: Night Sky with A810
« Reply #1 on: 16 / January / 2013, 11:43:58 »
From Chester, I often see the ISS in that direction, but maybe higher in the sky.

Probably too late now but the HeavensAbove website will give you the times the ISS can be seen.

David
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Offline casrap

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Re: Night Sky with A810
« Reply #2 on: 16 / January / 2013, 14:47:53 »
The 'moving target' is in fact the only stationary object in your picture ;)
Its a hot-pixel that seems to move as you 'freeze' the rest of the frame during stacking.
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Offline Davo

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Re: Night Sky with A810
« Reply #3 on: 17 / January / 2013, 06:23:06 »
Am I dumb or what  ::)

I checked the Heavens Above site which is good because you can check for past dates. I had it narrowed down to a Russian Cosmos rocket when I saw the hot pixel note. I found another one on the full image which looks identical.

I am just glad I didn't submit it as a discovery to ESA.
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Offline Davo

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Re: Night Sky with A810
« Reply #4 on: 17 / January / 2013, 17:30:48 »
Clear skies again tonight so I mounted my A810 on my tracking mount which allowed me to shoot longer exposures. Here is another shot of Orion made with 10x 100ISO x 60s RAWS. There are many more stars visible and I even caught the Orion nebula. Next time I will zoom into the nebula and try for more detail.
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Offline Microfunguy

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Re: Night Sky with A810
« Reply #5 on: 17 / January / 2013, 18:26:17 »
Do the individual frames show skyglow ?

Even a 30 second exposure does from my location.
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Offline lapser

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Re: Night Sky with A810
« Reply #6 on: 17 / January / 2013, 19:27:44 »
Quote from: Microfunguy on 17 / January / 2013, 18:26:17
Do the individual frames show skyglow ?
Even a 30 second exposure does from my location.
If you increase the contrast, it looks like there may be a glow at the lower left.
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Offline Davo

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Re: Night Sky with A810 (part 2)
« Reply #7 on: 18 / January / 2013, 06:59:13 »
There is some ground glow in the image due to the fact that I live in town at 57N and there is plenty of light pollution. Orion doesn't get really high at my location. Attached is the full image so you can see what I mean. I will post another shot next that shows the sky above Orion with less ground glow.

admin edit: replaced attached image image with 50% rescaled version as it was somehow corrupting the thread.

« Last Edit: 19 / January / 2013, 14:27:56 by acseven »
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Offline Davo

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Re: Re: Night Sky with A810 (part 2)
« Reply #8 on: 18 / January / 2013, 07:03:42 »
Here is the sky above the previous shot with less light pollution because it is further from the local lights. Again, 10 shots RAW @100ISO and 60s.

Correction: These were actually 80.6s exposures.

I must say I am really impressed with the A810. My 300D DSLR cannot match its performance.

I will do some more tests to see how long an exposure I can wring out of it.

admin edit: replaced attached image image with 50% rescaled version as it was somehow corrupting the thread.
 
« Last Edit: 19 / January / 2013, 14:28:10 by acseven »
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Offline casrap

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Re: Re: Night Sky with A810 (part 2)
« Reply #9 on: 18 / January / 2013, 16:52:35 »
Looking really good!
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