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Old 02-10-2023, 08:48 PM
Dennis
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Saturn with 9 Moons - Mewlon 210

I managed to grab the 9 brighter moons of Saturn last night from our back garden in Brisbane with my Tak Mewlon 210 F11.5, Tak x1.6 Extender and ASI2600MM Pro camera.

To cater for the varying brightness levels, I grabbed a series of test exposures ranging from 01 sec to 30 secs and used the following data sets to generate the final composite image using Layers In PS CC to blend the 3 sets of images together.

05 secs x 30 frames 11:00pm to 11:04pm AEST (UT+10).
15 secs x 30 frames 11:11pm to 11:20pm AEST(UT+10).
02 secs x21 frames 11:28pm to 11:30pm AEST(UT+10).

The timing was critical as Mimas was moving away from the bright disc whereas Enceladus was gradually being swamped by the bright rings.

SkyTools 4 Imaging provides the following details for 11:15pm AEST (UT+10).

Saturn at Magnitude: 0.54

Satellites:
Name Mag PA° Sep"
Mimas 13.0 271.9 27.5
Enceladus 11.8 100.6 33.4
Tethys 10.3 275.0 44.6
Dione 10.5 91.5 53.2
Rhea 9.8 269.6 69.4
Titan 8.4 118.5 79.0
Hyperion 14.3 287.0 128.9
Iapetus 11.2 100.9 65.1
Phoebe 16.6 240.1 600.3

The image of Saturn was taken with my ASI662MC and blended in over the blown out Saturn.

The image of the inner moons is a full res crop and the wider view has been resampled down to fit in Phoebe, some way away from the planet.

Dennis
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Click for full-size image (Saturn 9 Moons Crop 1280.jpg)
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Click for full-size image (ST4 Screen Capture.jpg)
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Click for full-size image (Sat_210703_290923_ZWO ASI662MC_Gain410_Exp15ms_Rx10.jpg)
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  #2  
Old 02-10-2023, 09:32 PM
Dave882 (David)
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Very cool shot Dennis. Well planned and executed. Love your work!
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  #3  
Old 03-10-2023, 07:40 AM
Dennis
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Thanks David, I appreciate your comments.

I had SkyTools 4 Imaging up and running at the time, to monitor Enceladus approaching the glare of Saturn and Mimas hauling itself out of the glare of the over exposed Saturn. This helped me plan for the optimum set of exposures and the best time to start the capture sequences.

I was lucky that the diffraction spikes from the secondary vanes of the Mewlon 210 did not obliterate the fainter moons.

Dennis
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Old 03-10-2023, 08:46 AM
Saturnine (Jeff)
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Will add my 2 cents worth, also love your work Dennis. Nice project to capture all those moons, Phoebe at 16.6 mag is a great catch, even Hyperion and Mimas are not easy, especially from suburbia.
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Old 03-10-2023, 06:56 PM
Dennis
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Will add my 2 cents worth, also love your work Dennis. Nice project to capture all those moons, Phoebe at 16.6 mag is a great catch, even Hyperion and Mimas are not easy, especially from suburbia.
Thanks Jeff, I went back to the data and in the 30 x 2 sec frames, after Aligning and Stacking in CCDStack (PixInsight spat the dummy - too few stars) a strong histogram stretch actually picked up Phoebe, not bad for 2 secs.

Hyperion was quite evident even in the Mewlon spider vane diffraction spike.

Dennis
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Old 03-10-2023, 07:16 PM
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AstroViking (Steve)
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Very well done, Dennis.

Although I feed sad for Phoebe, all the way out there on her lonesome....
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Old 03-10-2023, 08:01 PM
Dennis
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Very well done, Dennis.

Although I feed sad for Phoebe, all the way out there on her lonesome....
Thanks Steve, although when I ran SkyTools 4 Imaging backwards, to Sept 9th, Phoebe was closer and Iapetus was on the outer. They must have highly eccentric orbits as viewed from Earth.

Dennis
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Old 04-10-2023, 06:23 AM
N1 (Mirko)
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Excellent captures!
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  #9  
Old 04-10-2023, 04:45 PM
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Cheers Dennis always enjoy your posts.
Derek
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  #10  
Old 04-10-2023, 06:56 PM
Dennis
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Excellent captures!
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Cheers Dennis always enjoy your posts.
Derek
Thank you Mirko and Derek, I appreciate your comments.

It was quite magical sitting at the telescope/Notebook watching these moons across the enormity of our solar system.

Dennis
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Old 08-11-2023, 12:02 PM
Leo.G (Leo)
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Stunning, amazing images!



Maybe a stupid question but how do you compensate for the lack of brightness in the moons and the planet being excessively blown out to capture the moons?
I understand overexposing the planet to capture the light reflected off the moons and take separate frames of sufficiently exposed moons and correctly exposed planets.

I have images of both Saturn and Jupiter with moons included in their correct positions but requires excessive overexposure of the planets to capture the light of the moons in separate frames and when cut to paste the moons in with the correct exposure stack of the planets there always seems to be remnants of the light. Maybe its a "P.I.C.N.I.C." issue, problem in chair not in computer?


I don't do the cutting and pasting, I'm too blind and too stupid, my son does that in photoshop for me.
I don't share my images here, everyone would just laugh but I play with what I have and like my tiny specks of planets, mostly taken through a 152mm Skywatcher Achromat with my old Nikon D80. I haven't tried with the full frame camera yet, the little dots will only get smaller.


In saying that I was recently given an older firewire version of the ImagingSource colour camera by a very kind fellow member, which captures frames at 640x480 (and I've figured out how to shoot AVI instead of BMP images) and have an 8" Newt and ED 2 times Barlow and I'm keen to try for Jupiter if these bloody clouds EVER disappear. I recently used the camera for some lunar shots through my little 80mm Megrez (original semi APO (whatever that's supposed to mean)) only mounted on it's original travel tripod with severe wear in the head and I could only capture very small amounts of detail at a time so I'm guessing it will bring Jupiter up nicely on the 8" Newtonian with the ED Barlow.


I've been playing with this stuff since the 80s with 35mm film but never had the finances to buy great equipment but I'm happy and work with what I have. If I could get images 100th the quality of what I see here I'd be extremely happy.
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Old 08-11-2023, 12:48 PM
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Nice work all-round there Dennis, especially like your efforts with the wide field. Top Stuff.
Cheers
Trevor
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  #13  
Old 09-11-2023, 07:35 AM
Dennis
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Quote:
Originally Posted by Leo.G View Post
Stunning, amazing images!

Maybe a stupid question but how do you compensate for the lack of brightness in the moons and the planet being excessively blown out to capture the moons?
I understand overexposing the planet to capture the light reflected off the moons and take separate frames of sufficiently exposed moons and correctly exposed planets.

I have images of both Saturn and Jupiter with moons included in their correct positions but requires excessive overexposure of the planets to capture the light of the moons in separate frames and when cut to paste the moons in with the correct exposure stack of the planets there always seems to be remnants of the light. Maybe its a "P.I.C.N.I.C." issue, problem in chair not in computer?


I don't do the cutting and pasting, I'm too blind and too stupid, my son does that in photoshop for me.
I don't share my images here, everyone would just laugh but I play with what I have and like my tiny specks of planets, mostly taken through a 152mm Skywatcher Achromat with my old Nikon D80. I haven't tried with the full frame camera yet, the little dots will only get smaller.


In saying that I was recently given an older firewire version of the ImagingSource colour camera by a very kind fellow member, which captures frames at 640x480 (and I've figured out how to shoot AVI instead of BMP images) and have an 8" Newt and ED 2 times Barlow and I'm keen to try for Jupiter if these bloody clouds EVER disappear. I recently used the camera for some lunar shots through my little 80mm Megrez (original semi APO (whatever that's supposed to mean)) only mounted on it's original travel tripod with severe wear in the head and I could only capture very small amounts of detail at a time so I'm guessing it will bring Jupiter up nicely on the 8" Newtonian with the ED Barlow.

I've been playing with this stuff since the 80s with 35mm film but never had the finances to buy great equipment but I'm happy and work with what I have. If I could get images 100th the quality of what I see here I'd be extremely happy.
Hi Leo

A lot of this is experimentation with what you are seeing live on the Notebook screen via your capture program. I adjust the exposures for the various Moons of Saturn and observe the screen, just so that I can reliably see them, despite the overwhelming glare of Saturn. I then record that SER file.

This makes the brighter Moons look quite bloated and therefore distorts their relationship with Saturn's disc.

I did not attempt to make a pretty picture for this project, as it would have required way to much post processing.

I guess the easiest, but least fulfilling way, would be to ask one of the AI programs to generate a picture of Saturn and its fainter satellites.

Cheers

Dennis
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  #14  
Old 09-11-2023, 07:36 AM
Dennis
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Nice work all-round there Dennis, especially like your efforts with the wide field. Top Stuff.
Cheers
Trevor
Thanks Trevor, I appreciate your comments.

Dennis
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