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Jupiter/Saturn, Skyris 618M, 120fps, LRGB filters

Posted: Wed Jul 22, 2020 11:57 am
by turfpit
Captured 12 July 2020, both planets near the meridian, elevation ~14°. One of the UK astro gear suppliers has been having a clear-out out older Celestron camera models. I took advantage to acquire a Celestron Skyris 618M USB3 lunar/planetary mono CCD camera capable of delivering 120fps @ 640x480. The camera cost £130 and is actually a Celestron badged Imaging Source DMK 23U618. Review here https://s3.amazonaws.com/celestron-site ... ams_AN.pdf. Poor conditions but an opportunity to learn about the workflow for acquiring LRGB planetary images and processing using WinJupos (for derotation). WinJupos is used to reduce/elimate smearing of detail due to the fast rotation of these planets - around 10h in the case of Jupiter. The objective was to collect 5 videos of each filter within approximately 15 minutes.

Saturn-Jupiter-LRGB.png
Saturn-Jupiter-LRGB.png (134.32 KiB) Viewed 347 times

Equipment: Celestron C8, Celestron LRGB filters, Celestron manual filter wheel, Celestron Skyris 618M camera
Software: Sharpcap 3.2, Autostakkert3, Registax 6, WinJupos 11, GIMP 2.10.
Reference: https://www.thelondonastronomer.com/it- ... ry-imaging


Capture:
  • Set WinJupos file names in Sharpcap settings
  • Focus using the G filter, check this focus against all 4 filters
  • Set gain = 60% for Jupiter, 70% for Saturn
  • Adjust exposure using log histogram so saturation (right hand side) = 70% for Jupiter (80% for Saturn)
  • Capture 45s SER video at 120 fps for each of L, R, G, B filters
  • Repeat to acquire 4 more sets of LRGB images, a total of 20 videos
I didn't re-focus between filters - with atmospheric wobble and the large number of frames acquired per video, the statistics were in my favour.


2020-07-12-0003_5.CameraSettings.txt
(466 Bytes) Downloaded 14 times

Jupiter-Capture-B-filter.JPG
Jupiter-Capture-B-filter.JPG (65.08 KiB) Viewed 347 times


Processing:
  • Stack all 20 SER videos using Autostakkert!3, best 20% of 5000 frames
  • Using the AS!3 sharpened stacks, derotate 20 stacks using WinJupos
  • Combine the 5 L stacks using WinJupos
  • Combine the the 5 R, 5 G, 5 B stacks using WinJupos
  • Mild sharpening of the 4 resultant L,R,G,B stacks using Registax 6
  • Create an RGB image using WinJupos
  • Combine the L & RGB images using layers in GIMP (not sure I have this one right yet)
  • Final sharpen in Registax 6
To get better detail I need to be using my 2x Barlow. Unfortunately, the low elevation of the planets will be against me unless the seeing is excellent. I will soon have astronomical darkness back at my 53° latitude which will help. Mars might be a better option later in the year as it will be higher in the sky.

I am looking forward to capturing some lunar images with this 120fps (with 5.6um x 5.6um sensor) camera.

Some additional info.


B-filter-video-playback.JPG
B-filter-video-playback.JPG (33.14 KiB) Viewed 347 times

SER-details.JPG
SER-details.JPG (42.3 KiB) Viewed 347 times

L_R_G_B-stacks.PNG
L_R_G_B-stacks.PNG (81.82 KiB) Viewed 347 times

RGB-WinJupos-combine.PNG
RGB-WinJupos-combine.PNG (67.43 KiB) Viewed 347 times


Dave

Re: Jupiter/Saturn, Skyris 618M, 120fps, LRGB filters

Posted: Wed Jul 22, 2020 12:43 pm
by oopfan
Truly amazing, Dave!

Color images from a monochrome camera using LRGB filters. Who would have thought it could be done?
14 degrees above the horizon. The atmosphere must have been boiling.

Brian

Re: Jupiter/Saturn, Skyris 618M, 120fps, LRGB filters

Posted: Wed Jul 22, 2020 1:41 pm
by turfpit
Thanks Brian. I am under no illusions - I have a long way to go. Still I now have some idea of the workflow involved. On subsequent bench testing I have found that the camera will deliver 120 fps at MONO16 (12-bit stretched I suppose) so that will be the next trial.

It took Damian Peach 20 years http://www.damianpeach.com/jupiter.htm to get there and he ended up using a 1m RC scope up a mountain (chilescope). One of his LRGB efforts http://www.astrosurf.com/luxorion/Scien ... -peach.jpg.

Dave

Re: Jupiter/Saturn, Skyris 618M, 120fps, LRGB filters

Posted: Wed Jul 22, 2020 6:57 pm
by umasscrew39
Very cool planetary work, Dave. I learn a lot just reading all of the information you provide. Thanks for sharing.

Bruce

Re: Jupiter/Saturn, Skyris 618M, 120fps, LRGB filters

Posted: Wed Jul 22, 2020 7:34 pm
by turfpit
Thanks Bruce.