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Mars at low altitude, 150 fps, just because

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#1 Stricnine

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Posted 27 September 2020 - 08:44 AM

I was about to head in, the seeing had been good earlier and had been deteriorating.  Earlier a neighbor had stopped by to ask about the setup and what I was looking at on the Moon.  We talked a while, at one point I pointed out Mars low on the eastern horizon.  Just as I was 'calling it' I decided to slew over to Mars on a whim, probably influenced by talking of it with the neighbor.  It wasn't quite as unstable and distorted as I expected, so I bumped the frame rate to 150 and recorded two 3 minute videos, the second I had to pause to correct the framing when a wind gust pushed the telescope and Mars was too close the edge of the ROI.  I ended up with approx 48000 frames, stacked 10% and ended up with this:

 

2020-09-27 Mars v2a v1

 

Which I'm happy with given that Mars was around 18 to 20 deg above the horizon at the time, and focusing was mostly guessing.

 

Here's a short animation of the first 75 frames (approximately a 1/2 second):

2020-09-27 Mars animation
 
David

 


Edited by Stricnine, 27 September 2020 - 09:10 AM.

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#2 jerobe

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Posted 27 September 2020 - 09:10 AM

Very nice. You got a good one there!


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#3 John Rogers

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Posted 27 September 2020 - 09:33 AM

Beautiful!  Thanks for including the animation.  Seeing quality is often subjective and difficult to measure and quantify.  Your animation adds some important perspective.

 

Are you using an Atmospheric Dispersion Corrector?  I don't see any evidence of fringing in your animation.


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#4 Stricnine

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Posted 27 September 2020 - 09:40 AM

Beautiful!  Thanks for including the animation.  Seeing quality is often subjective and difficult to measure and quantify.  Your animation adds some important perspective.

 

Are you using an Atmospheric Dispersion Corrector?  I don't see any evidence of fringing in your animation.

Yes, a ZWO ADC.  Like focusing, getting the ADC set to minimize the dispersion was difficult to know if it was visually right, or at least close enough, due to the undulating image.  The ADC was close to being maxed out.


Edited by Stricnine, 27 September 2020 - 09:43 AM.

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#5 Finalfantasykid

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Posted 27 September 2020 - 04:00 PM

Looks fantastic.  I really like the colours and the contrast between the light/dark regions.


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#6 KTAZ

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Posted 27 September 2020 - 04:07 PM

What magnification were you running at? Were you using your reducer plus a barlow?



#7 Kiwi Paul

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Posted 27 September 2020 - 04:40 PM

Great shot David.
You have convinced me to give mars ago at these altitudes. Mars is coming into our evening sky now but it seems to be painfully slow - have followed it from about 4am for several months now.
Cheers Paul
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#8 Stricnine

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Posted 27 September 2020 - 08:00 PM

What magnification were you running at? Were you using your reducer plus a barlow?

I just used a Tele Vue 2x Powermate to increase image size.  I don't normally use a reducer for any imaging now, DSO or Planetary/Lunar.



#9 sunnyday

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Posted 27 September 2020 - 08:07 PM

very nice details in there , thanks .




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