Green planets

General astronomy-related discussion (publicly viewable)
Post Reply
User avatar
Pete
Astro Day Coordinator
Posts: 3254
Joined: Fri Jun 13, 2003 9:03 pm

Green planets

Unread post by Pete » Tue Aug 25, 2020 3:59 pm

Monday, 24 Aug 2020

Jupiter and Saturn are brilliant in the early evening, and although a bit low hopefully the seeing will be typical of a slightly humid summer night.

The SBIG’s stripped from the 14 and Altair’s centered using an illuminated reticle eyepiece. The eyepiece’s than moved to the 80mm long-tube guidescope and the guidescope’s centered as well. (With the tiny planetcam chip it an be challenging to put a planet in the FOV at 3550 mm FL.)

Slewing to Jupiter and carefully centering on it, the Celestron NexImage 5 is mounted on the 14. Several 3,000 image AVIs are run later processed thru Registax. Jupiter has a green cast to it. As to why, I’ve no clue.
Image
With heavy PhotoShop processing the color is a bit better. And the great red spot is red. On the left, Europa (higher) and Io (lower) look like they’ve been run thru a prism  Of course, making the images smaller would help a whole lot.

Saturn is a good bit dimmer and even with gain maxed out exposures are only 1/32 or 1/50 second whereas Jupiter was imaged with 1/72 second exposures.
Again 3,000 frame AVIs were subsequently processed thru Registax. Garbage in, garbage out.
Image
Color was strange. Processed the green tint out but this is not accurate either.

Conclusions & lessons learned:

Although stars weren’t twinkiling seeing wasn’t good.

Not sure that I learned much tonight, other than that the Celestron planetcam seems to be off-color and that R, G & B seem to be misaligned. Unable to use the Registax color alignment tool to correct things.
Pete P.
TimW
Posts: 614
Joined: Wed Oct 18, 2017 1:15 pm

Re: Green planets

Unread post by TimW » Tue Sep 01, 2020 12:18 pm

Are you using the correct bayer pattern?
Tim W.

Laurie J. Wood
March 22, 1967 - August 23, 2019
Forever in my memory. Forever in my heart.

Scope: 8" Celestron SCT on an AVX equatorial mount
Solar Scope: Lunt Solar System 60 mm Double-Stacked H-Alpha
Solar Imaging Camera: ZWO ASI174mm monochrome
Imaging Camera: ZWO ASI1600MC-Cool
Autoguide: PHD2
Image Capturing: SharpCap
DebayerIng: PIPP
Planetary Stacking: Autostakkert
Planetary Post Processing: Registax
Deep Sky Stacking: Deep Sky Stacker
Deep Sky Post Processing: Photoshop
User avatar
NGC7000
10+ Years Member
Posts: 2572
Joined: Thu Dec 21, 2006 9:51 pm

Re: Green planets

Unread post by NGC7000 » Tue Sep 01, 2020 12:23 pm

That's what I was wondering. I'm pretty sure ZWO cameras are generally RGGB.
Tom H
Astra inclinant, sed non obligant.
TimW
Posts: 614
Joined: Wed Oct 18, 2017 1:15 pm

Re: Green planets

Unread post by TimW » Tue Sep 01, 2020 12:26 pm

I have a ZWO camera with bayer pattern GRBG.
Tim W.

Laurie J. Wood
March 22, 1967 - August 23, 2019
Forever in my memory. Forever in my heart.

Scope: 8" Celestron SCT on an AVX equatorial mount
Solar Scope: Lunt Solar System 60 mm Double-Stacked H-Alpha
Solar Imaging Camera: ZWO ASI174mm monochrome
Imaging Camera: ZWO ASI1600MC-Cool
Autoguide: PHD2
Image Capturing: SharpCap
DebayerIng: PIPP
Planetary Stacking: Autostakkert
Planetary Post Processing: Registax
Deep Sky Stacking: Deep Sky Stacker
Deep Sky Post Processing: Photoshop
Bruce D
Life Member
Posts: 5274
Joined: Sat Jun 14, 2003 6:10 am

Re: Green planets

Unread post by Bruce D » Tue Sep 01, 2020 12:37 pm

Tim was over with his camera and i had my new ZWO camera (different model) and i was having fits trying to get an image until Tim suggested trying different bayer patterns, bingo! Not all ZWO cameras use the same pattern
Bruce D
User avatar
NGC7000
10+ Years Member
Posts: 2572
Joined: Thu Dec 21, 2006 9:51 pm

Re: Green planets

Unread post by NGC7000 » Tue Sep 01, 2020 2:43 pm

Do you remember which one yours used, Bruce? It might be the same as mine.
Tom H
Astra inclinant, sed non obligant.
Bruce D
Life Member
Posts: 5274
Joined: Sat Jun 14, 2003 6:10 am

Re: Green planets

Unread post by Bruce D » Tue Sep 01, 2020 4:01 pm

Haha Tom, being a bit dyslexic i can't tell one from the other. Every time i use the camera i have to try the 3 options until I get a usable image. Generally when it's wrong i don't get anything recognizable, just a weird cross hatch pattern. Do we both have the same camera?
Bruce D
User avatar
Pete
Astro Day Coordinator
Posts: 3254
Joined: Fri Jun 13, 2003 9:03 pm

Re: Green planets

Unread post by Pete » Tue Sep 01, 2020 5:32 pm

Good call on Bayer matrix. Suspect you're right.

The AVIs on these green planets were stacked and processed in Registax 6, because I hadn't yet figured out how to use AutoStakkert. In Registax 6 there is a little button called "Show Prefilter" that allows the selection of "Bayer method". And this may have been the problem. Accidently erased the green planets. Too bad I can't check the original AVIs as that'd answer the question. But then again, the question's probably answered as I didn't notice the discoloration when imaging and probably would have.

In AutoStakert there is also a Bayer selection. Didn't see a big problem with Luna and Mars from Sunday night so the "auto select" probably worked. I can force it to RGGB and I have.

Thanks for the help Tim.
Pete P.
TimW
Posts: 614
Joined: Wed Oct 18, 2017 1:15 pm

Re: Green planets

Unread post by TimW » Tue Sep 01, 2020 5:46 pm

I use PIPP for debayering, then Autostakkert for stacking, then Registax to adjust the wavelets.
Jupiter with spot.jpg
Jupiter with spot.jpg (23.63 KiB) Viewed 402 times
Tim W.

Laurie J. Wood
March 22, 1967 - August 23, 2019
Forever in my memory. Forever in my heart.

Scope: 8" Celestron SCT on an AVX equatorial mount
Solar Scope: Lunt Solar System 60 mm Double-Stacked H-Alpha
Solar Imaging Camera: ZWO ASI174mm monochrome
Imaging Camera: ZWO ASI1600MC-Cool
Autoguide: PHD2
Image Capturing: SharpCap
DebayerIng: PIPP
Planetary Stacking: Autostakkert
Planetary Post Processing: Registax
Deep Sky Stacking: Deep Sky Stacker
Deep Sky Post Processing: Photoshop
Bruce D
Life Member
Posts: 5274
Joined: Sat Jun 14, 2003 6:10 am

Re: Green planets

Unread post by Bruce D » Tue Sep 01, 2020 6:04 pm

Great image Tim!
Bruce D
Post Reply