#2024-07-25 - Venus in near UV and Infrared

146 messages · Page 1 of 1 (latest)

pure tundra
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Man I tried venus and it was hideous! do you use an atmospheric dispersion corrector?

wet wadi
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This is amazing, honestly any picture of Venus with color in it I love!

blissful crest
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That UV must’ve been rather noisy at 550fps lmao

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Oh sorry it’s #47 so not too bad

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Yeah the corrector plate will absorb a lot of actual UV

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Violet is probably the best you can do

blissful crest
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Yup

safe oasis
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woah ignoring the fact that its blurry it kind of looks like that closeup pic from NASA

pure tundra
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Whats derotation? Ive seen people mention that before.

safe oasis
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you DE rotate an object so kind of stacking the second time

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it can be done with winjupos

pure tundra
# safe oasis you DE rotate an object so kind of stacking the second time

so because the planets rotate you want to deroate them, gotcha, but why would that matter for Venus, you cant even see the surface. The clouds are likely rotating but still. How much improvement is there? what does it do for me? How does is it like stacking it a second time, how does that work?

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I am planning on getting a little more serious with planetary imaging. I have a colour camera, and no planetary filters, my best telescope is a deep sky scope with a shorter focal length compared to its aperture (f/4, 203mm/8inch), I have a hard time magnifying the objects while also staying under the magnification limit of my scope. I know filters are good to use for imaging the planets but which ones would you recommend to someone starting out? The only filters I have are my UV/IR cut filter, and my optolong L-pro filter which blocks light pollution for deepsky.

safe oasis
pure tundra
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Yeah I figured about the scope, ive been thinking its the last thing I need. I have a nice deep sky scope, a smaller deepsky scope with a higher FOV incase I want that, and now I need a scope thats good for planetary, but these are very expensive. I know aperture is resolution but what kind of focal length is good? like what f ratio should peak my interest? I know shmitt cassegrains are popular for planetary because they have wide apertures and back thousands of mm's of focal length in a smaller profile. Ill also spend some time to learn what derotating stacks means. Thanks for the tips! always trying to improve especially now that the planets are starting to come back into view.

pure tundra
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interesting, so a newt would provide better results, they are just cumbersome. Also what do you mean better barlows? there are cheap barlows???

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I thought a barlow was a barlow lmao

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by obstruction do you mean things that prevent light from hitting the sensor?

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Gotcha, cassegrains have worse obstruction?

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why do people love them then??

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I am getting the ZWO AM5N delivered soon and it has 15kg of payload I should be able to fit a beasty newt on there. I can collimate newts really well but an SCT is a whole new game

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cool, whats a good focal length to do planets? obviously my 8 inch f/4 mirror is no good, but what is the minimum that would be considered good, I know the more focal length, the less barlow I need.

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omg thats ENORMOUS

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4 meter long focal point

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ive never even seen a newt with specs like that

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are you talking about 4000mm focal point with barlow included?

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MENTAL

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I found a newt that has 1200mm focal length and its 8inch aperture

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f/6

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so would that ballbark be a decent scope barlow included? or should I find something with more focal length? because if its worth getting more then I wont bother. I haaaate collecting telescope junk I wont use.

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high quality barlows or high quality mirrors, I guess both would be better tbh

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gotcha

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what does a good barlow look like

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I have three

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I have the celestron 2x omni barlow, and a have a 3x and 5x svbony barlow

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the 5x is honestly hideous

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it makes artifacts around the edges

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I like my celestron the best

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glad I made that purchase, it was one of my first astronomy purchases almost a year ago now

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what does lamdba/10 mean?

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interesting, ive never heard of this statistic before. lambda/10 I would presume is as best as it gets?

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wow, alright Ill have to look into this then because I still dont really understand what it means and also what the scale means. Is it a measure of reflectivity?

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also how would you find that out? its not like its commonly shown to you when youre purchasing an instrument

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ohhh so like microscopic dips and groves

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optical quality

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yes I was talking with one of my telescope plugs about this exact topic and he told me he had a scope that had an optical quality that was extremely good. He said something like if his mirror was as wide as the Atlantic ocean, the largest imperfection in the mirror would be about a foot high.

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it was less then a wavelength of light or something crazy

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how can you tell what the optical quality is?

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like when I am buying a scope, its not like they make is abundantly clear, or will I have to build my own?

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he said something more specific, but I cannot recall what exactly he said

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So I would have to get it sent away to be tested?

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wouldnt every mirror have their own optical quality, even out of the same factory?

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the difference would be marginal at best

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okay so in summary, I need more focal length, to obtain this I will need a scope with a higher focal length and quality optics, I will also need quality Barlow's (which I have already, my celestron omni).

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I dont need filters because I use a colour camera.

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gotcha, ALSO

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I have a question about processing

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I did a picture of Saturn a couple of days ago, and I was struggling with getting the colour balance correct. what does your planetary workflow look like?

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gotcha so it wouldnt be helpful to me if you told me anything

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sort of but my main question is, how do I know the colour is accurate

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with deepspace, I use spectrophotometric colour calibration, which compares my image with satelite data to correct the colour

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it uses stars, but in planetary, I dont have stars

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okay fair enough lmao!

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yes that looks perfect, you just copy his pallette?

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god thats so nice

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it looks so cool!

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okay I wonder how he does it though, Ill have to do some more research.

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Getting serious though, just recently built my own observatory, and many of the parts I need I am waiting on.

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like my mount

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Ill ask him.

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here Ill show you some pics of my observatory I have been building

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yes, just built it

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the scope I have in the picture is a small 5inch newt f/5, maybe 400 bucks

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its honestly really nice

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made this with it

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yeah, its got a parabolic mirror and I am super impressed with the optics. Its an orion scope.

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its a shame they had to close their doors a couple weeks ago now

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yeah orion and meade closed their doors to customers in California very recently

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going out of business I think

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yeah celestron and skywatcher have been devouring the telescope market

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and then ZWO comes in hot.

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no competition there either

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Celestron practically owns the SCT market

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ive never even seen an SCT that isnt a celestron!

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let the market speak for itself

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I am setting up a really cool system with my observatory where my asiair will connect to a wifi range extender I bought and then when I connect to my home wifi I can connect to my telescope from the comfort of my bed!

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haha

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super excited about the mosaic feature

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yeah I had a laptop and I couldnt do it anymore

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you live in an apartment? I could never!

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far away farmland!

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is the way to go

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fair enough. I am 20 but I still live at home. Going to university...

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how do you image in an apartment???

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the roof?

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wow thats neat, I guess you would have to get really creative if you lived in an environment like that.

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I just walk outside and I see the milkyway

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joking I wish, I live in bortle 4/5

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no wonder you do planetary

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I only see the glow of lights on my horizons

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well anyways I am likely gonna head to bed here, thanks for the tips and clear skies!

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If I get any planetary images Ill make sure to show them to you

blissful crest
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Wholesome. Glad you like them. It took me ages to find the sweet spot

pure tundra
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What's your opinion on this new picture of Jupiter I created?

Jupiter_July_30th_2024_Barlow.png
pure tundra
# pure tundra What's your opinion on this new picture of Jupiter I created?

Same equipment as I used for my picture of Saturn. I think my issue with Saturn is not enought integration. It is dimmer so I likely need to record it for much longer. This image of Jupiter was create using 5 videos. In total all the videos was about 7000 frames. I stacked 20% and then processed using astrosurface and pixinsight.

pure tundra
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I tried the derotation but I couldnt figure out what I was doing wrong. My image always ended up looking smeared and not as sharp

pure tundra
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thats what I DID, maybe Ill study how to use it more.

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Do the pictures have to be in a certain order? or does it figure that out?

pure tundra
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I am pretty sure they have timestamps, but I had to convert them into UTC

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I think I was putting the times opposite, gonna try again

pure tundra
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So here is my first attempt at winJUPOS, what do you think?

2024-07-30-0835_7-FOV-Bin1_24.4C_f0001_list_mean_100r_243reg.png
pure tundra
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If the videos are not very far apart does winJUPOS have less of an effect? I shot five videos in the time frame of like 3 minutes

pure tundra
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Thanks but I have a feeling that the image isnt very different from my original process compared to what winjupos made.

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So if I recorded constantly for 30 minutes into many videos, it would work much better

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^

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Okay I understand, the longernyou record, the more rotation you record. I am gonna try and do Saturn tonight again.

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I am gonna record it for a long time

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And then derotate it

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Insane! Cant wait

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What do you use to process? I use pipp, astrosurface to stack and slightly process, wavelets... and then Ill use pixinsight to tweak the colour balance and other finishing touches

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Ig I would also include winJUPOS into my workflow going forward

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^

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Ive tried autostakkert, i like it but registax is clunky and old feeling to me.

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Have you tried astrosurface?

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Okay, ill switch back over and just practice at it then

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Alright, so tonight I plan on shooting Saturn, record for an hour, optimally when its highest in the sky, and camera gain or exposure settings you recommend?

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I know my cameras default gain setting is 252, so I generally keep it on that but then I wonder if increasing exposure time to get a brighter image is worth recording less frames.

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So prioritize frames even though I might get more read noise with higher gain?

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Gotcha

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My cameras maximum fos is 100 fps

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Fps^

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So ill try to keep it at that without increasing my gain too high, ill also try your settings

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How do I know if my settings or optimal? Is there some kind of test I can do?

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Ohhh I see, record different video with different settings and see whats best

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Gotcha

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Cant wait, im excited!

pure tundra
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Hey I actually had one more question, when your stacking your planetary pictures, do you use drizzle or no? I know some people use it but I am not sure if I should or not.

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okay thanks just wanted to make sure that I wasnt missing something, I drizzle with my deepspace photography because it increases SNR but I wasnt sure if there was something like that for planetary.

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gotcha, okay thanks! reprocessing my Mars picture and I am going to try winJUPOS

pure tundra
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Here the Mars, what do you think? there seems to be an artifact in the bottom right, like a white pixel. I had a hard time lining up the planet.

2024-07-30-0837_9-FOV-Bin1_24.5C_lapl4_ap1.png