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Old 16-10-2020, 07:43 PM
Dennis
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Mars with 60 mins of Phobos and Deimos orbital motion - Brisbane 15 Oct 2020

Here are a series of images that show an LRGB Mars (SER File via FireCapture), overlaid with a series of 60 x 1 sec frames (FITs files via Camera Control in The Sky X Pro) of Phobos and Deimos, taken at 60 second intervals, to show the orbits of these somewhat dim and diminutive satellites of Mars.

Images recorded on 15th October 2020 with my Tak Mewlon 210 F11.5, Televue x2 Powermate, ASI1600MM Camera.


Cheers

Dennis
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Click for full-size image (Mars LRGB and Phobos and Deimos Moons.jpg)
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Click for full-size image (Mars LRGB and Phobos and Deimos orbits 60 mins 1024x768.jpg)
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Click for full-size image (Mars LRGB and Phobos and Deimos orbits 60 mins Text 1024x768.jpg)
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Click for full-size image (Phobos and Deimos Orbital Path 60 mins.jpg)
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Click for full-size image (Phobos and Deimos Orbital Path Text.jpg)
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Click for full-size image (Phobos and Deimos orbits 60 mins Mars LRGB Overlay.jpg)
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Click for full-size image (Phobos and Deimos orbits 60 mins x 1 sec exposures.jpg)
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Old 16-10-2020, 07:59 PM
Tropo-Bob (Bob)
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Awesome!!
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Old 16-10-2020, 08:45 PM
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Love that one! Awesome.
Overlaying the orbits gives a sense of depth. Uber cool.

Last edited by multiweb; 17-10-2020 at 10:08 AM.
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Old 17-10-2020, 06:54 AM
RichardJ (Richard)
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Awesome Dennis!
Uber cool.

Richard.
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Old 17-10-2020, 07:10 AM
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One for the pool room, that is so awesome
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Old 17-10-2020, 08:49 AM
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Excellent work, those little moons sure move quickly.

I'm a little confused by your statement "overlaid with a series of 60 x 1 sec frames ... taken at 60 second intervals", can you explain that a little more please?

I assume the 5 shots of the moons are about 15 minutes apart, did you combine the 60x1 sec frames? Something else?

Thanks, keep posting these excellent images.

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Overlaying the orbits gives a sense of death. Uber cool.:
Wow, I hope not
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Old 17-10-2020, 09:24 AM
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How good is that !
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Old 17-10-2020, 09:40 AM
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Amazing that you could even pick up these tiny moons and the final composition is masterful.
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  #9  
Old 17-10-2020, 09:45 AM
Dennis
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Quote:
Originally Posted by Tulloch View Post
Excellent work, those little moons sure move quickly.

I'm a little confused by your statement "overlaid with a series of 60 x 1 sec frames ... taken at 60 second intervals", can you explain that a little more please?

I assume the 5 shots of the moons are about 15 minutes apart, did you combine the 60x1 sec frames? Something else?

Thanks, keep posting these excellent images.

>snip
Hi Andrew

I'll write this for a reader who may not have attempted this before, so bear with me for covering ground you that I know you are totally familiar with.

For Mars, I used Firecapture and the ASI1600MM with an ROI of 1024x768 to capture 30 sec duration LRGB SER Files which I processed in Autostakkert!3. As the SER files were exposed for Mars, they did not record the much fainter moons. This gave me a test LRGB series at the start of the session. I followed it up with another LRGB after capturing the fainter moons. I used the later LRGB image in the final composition as Mars was at a greater altitude with slightly better seeing.

I then closed Firecapture and opened up the connection to the ASI1600MM in the Camera Control Add-on in the Sky X Pro and set up an imaging sequence for the much fainter moons. Experimentation led me to choose an exposure of 1 sec, which revealed the moons but did not swamp Phobos with over exposure from the diffraction patterns of the spider vanes.

I took x60 frames, exposure of 1 second with a wait interval of 60 secs between each exposure. That is, I took a 1 sec exposure every 60 secs for 1 hour, thus recording the orbital trails of Phobos and Deimos over the 1 hour interval, which was the “gap” between Phobos clearing the horizontal diffraction spike and then entering the glare for the vertical diffraction spike.

I used Images Plus to Align and Stack the 60 x 1 sec exposures with a setting of Max for Combine and this produced the image of the spider vane diffraction with a blown-out Mars and the fainter trails of Phobos and Deimos. It was nice to see how much quicker (and nearer to) that Phobos orbits Mars as its trail over 60 minutes was longer.

So, I ended up with an LRGB image of Mars and a blown out combined image showing the orbital motion of Phobos and Deimos as trails. I stacked these 2 images as in PS CC and then just used a Layer (with “holes”) to reveal the start, end, middle and 2 intermediate positions of the moons, rather than show their smeared orbital path.

Hope that provides a more clear explanation.

Cheers

Dennis
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Old 17-10-2020, 10:09 AM
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Quote:
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Wow, I hope not
Oops! Grim reaper spelling fixed.
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Old 17-10-2020, 01:24 PM
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Quote:
Originally Posted by Dennis View Post
Hi Andrew

I'll write this for a reader who may not have attempted this before, so bear with me for covering ground you that I know you are totally familiar with.

...

Hope that provides a more clear explanation.

Cheers

Dennis
Hi Dennis, an interesting approach, thanks for the explanation.
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Old 30-10-2020, 04:35 PM
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Congrats Dennis on your 'Fear and Dread' APOD 30.10.20 showing Phobos and Deimos path around Mars.

Regards, John.
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Old 30-10-2020, 06:16 PM
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APOD! Woot!
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Old 30-10-2020, 06:33 PM
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Double wow! One for the amazing capture, one for the APOD Dennis!
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Old 30-10-2020, 07:05 PM
Dennis
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Thank you John, Troy and Rob, I appreciate your comments.

Cheers

Dennis
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Old 30-10-2020, 09:30 PM
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Congrats DENNIS!

So well deserved.

John K.
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Old 31-10-2020, 07:30 AM
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Dennis,
Very scientific display and cleverly thought out process to produce this example of our neighbouring planet and moons- not something seen commonly- hats off to you and well done on your accolade.
Anth
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Old 31-10-2020, 09:15 AM
Dennis
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Thank you John and Anthony, I appreciate your comments.

I am continuously astonished at the results the amateur astronomer can obtain with the blend of today's optics, mounts, cameras and software; we truly are blessed.

Cheers

Dennis
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Old 01-11-2020, 07:17 AM
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https://apod.nasa.gov/apod/ap201030.html

Quote:
Originally Posted by Dennis View Post
Thank you John and Anthony, I appreciate your comments.

I am continuously astonished at the results the amateur astronomer can obtain with the blend of today's optics, mounts, cameras and software; we truly are blessed.

Cheers

Dennis
honestly Dennis you are indeed a treasure of experience and knowledge, so deserved accolades
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Old 01-11-2020, 06:15 PM
Dennis
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Quote:
Originally Posted by h0ughy View Post
https://apod.nasa.gov/apod/ap201030.html

honestly Dennis you are indeed a treasure of experience and knowledge, so deserved accolades
Thank you David, I appreciate your comments. These projects also provide a lot of fun and interest in the post capture phase, chasing down all the faint objects.

Cheers

Dennis
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