Venus UV/IR 08/09/2021

[multiweb]

I tried to catch Venus higher this time and it made a fair difference. I also used a 807nm IR bandpass instead of 742nm. The UV channel was a lot clearer this time as I was away from the roofs. As a result I got a bit more fine details. Cloud patterns look different in the UV channel from last week so I included a roll over. I guess that's expected. :question:

[h0ughy]

Awesome result Marc. The animation is grand and shows heaps

[N1]

Superbe

[Dave882]

Wow that’s good mate! I’ve got a couple filters on the way and definitely going to come back and have another go. May I ask about what time/elevation you found was best?

[multiweb]

Thanks mate :thumbsup: One week makes a difference. Few missing days in between. :lol: Not much changes within one hour though but I need to refine my capture settings and processing techniques to show more.


Merci :thumbsup:


Thanks Dave :thumbsup:. Catch it as high as you can. That's my advice. As it goes closer to the horizon you can really tell the captures degrade. I'll have to check but it was above 30 degrees when I started and the sky was still blue. Which creates another problem. Background noise. So the sweet spot is when the sky gets darker and the planet is still high. Last night would have been perfect if not for the clouds and seeing. This week end is clear but the jetstream forecast is really bad.

[Retrograde]

Another amazing capture Marc.

The animation clearly shows the change in structure from last week. Uber cool!

[multiweb]

Thanks Pete :thumbsup: I was reading Venus atmosphere is changing very rapidly. I can't see any changes or rotation within one session though :question: Not like Jupiter or Mars. So I might stack all the sequences from now on see if I can increase the UV SNR.

[Camelopardalis]

Awesome Marc, thanks for sharing :thumbsup:

[Eris]

Another great set of UV/IR images of our sister planet Marc. Looking forward to seeing your progress as Venus approaches. Well done.:thumbsup:

[MortonH]

Very cool.

[multiweb]

Thanks mate. :thumbsup: No worries.


Thanks Gerard. :thumbsup: Yeah I'm looking forward to improve processing and capture.


Thanks Morton. :thumbsup:
Four months later hey? Who would have thought. Missed that move by one week. :lol:

[AdamJL]

oh WHAT?!?!?!?! That first is next level. Absolutely incredible, Marc.

[multiweb]

Thanks Adam. :thumbsup: Different capture settings and trying to stack it all. Hopefully yields better details. Still very much a work in progress.

[Meow]

Great! What filter you use for the “orange” tint on the first image?

[astronobob]

Phenominal stuff Marc,,, havent seen this much detail on Venus before, top stuff :thumbsup:

[multiweb]

Thanks Dale :thumbsup: The bicolor is a blend 50/50 with IR mapped to red (807nm Astronomik) and UV mapped to blue (Baader U venus filter).



Thanks Bob. :thumbsup: It's not a new thing. There are stacks of UV/IR shots of venus online if you google them. Some with a lot more details. I reckon to start doing planetary seriously you need an aperture in excess of 10"

[Peter Ward]

Most excellent :thumbsup:

[multiweb]

Thank you Peter. :thumbsup:

[multiweb]

Received the ZWO ADC. It's the cheapest of the ADCs. Most are in the $500 ball park. Top of the range goes up to 3000 euros. The ZWO has good reviews so will give it a go next clear night on Mercury and Venus. I also took the AR window off the camera and I intend to shoot in 16bit SER which is needed to tame noise and be able to record those elusive clouds.

[Mickoid]

Great work there Marc, most shots I've taken of Venus over the years have looked like a white blob! I didn't know it was possible to achieve surface details with amateur equipment. Thanks for enlightening me!

[Hans Tucker]

The Tak looks right sexy with a Moonlight Focuser ... bring out the green.

Top of the range ADC goes up to 3000 euros ... and then some. http://gutekunst-optiksysteme.com/.

The ZWO ADC does a good job but I wonder what the go is with the leveling bubble.

[multiweb]

Yeah it has to be leveled with the horizon so the two prism zero with the level. One goes up and the other down by the same angle until you find the sweet spot.

[multiweb]

Mine do too mate in IR. I barely seen a tinge of darkness but it could be me wanting to see things. :lol: UV is very obvious in comparison but seeing affected a lot more. I'm shooting in 16bit next and I reckon I'll get something with the wider dynamic range when I stretch. Next trial will be over 900nm in IR but I need to turn a filter cell for that one first. It's a a small 10nm bandwidth 12mm filter I got from EO years ago. Too small to mount on anything I have. Should work if I keep it just in front of the sensor.

[RB]

Oh my gosh, how did I miss this ?!!!
Amazing work Marc.

:eyepop:

[multiweb]

Thanks mate. :thumbsup: Sunday night looks clear. I'll be back at it.

[graham.hobart]

Excellent work Marc, I do enjoy the info you provide too. Having a go tonight on the same planet but its lower on the horizon and no filters so expect blobbiness!!

[multiweb]

Thanks Graham. :thumbsup: Go for it. UV is what gives me the best details but supposedly IR should do too. I'm still to get any though. I can get hint of shades but that's about it. :shrug:

Got some good signal tonight. Both in IR and UV. I removed the AR window of the camera and shot in 16bit rather than 8bit this time. Made a significant difference with SNR and easier to stretch during processing.

[Dave882]

That’s a really great result Marc. Definite improvement. I had a go this afternoon as well but a bit of a bust for me.

[N1]

That's your best one yet Marc, excellent!

[multiweb]

Bummer. Tonight's clear again with likely better conditions so you can give it another go.


Yeah that was a bit of a surprise. I could see the UV details in the feed so I reckon removing the AR window played a big part. 16bit vs. 8bit definitely improves contrast as well. My concern was file size and the frame rate is halved but it's the way to go.

Because of increased SNR and lack of noise I'll check if I can possibly detect any cloud motion or rotation with the other streams. :question:

Still no signs of protomolecule though.

[multiweb]

Well nothing seems to be really moving. Might have to try over a longer period of time tonight again and see what I can get. I can't see any large shift in the pattern. Distortion also makes it hard to visualize.

Animated GIF is here (https://www.astropic.net/astro/2021-09-22--0819-0825_UV-Ven.gif).