Venus 21/08/2021

[multiweb]

This is a shot of Venus. In IR. Pretty featureless. I was definitely in focus and not clipping the histogram. Not sure if it's supposed to look like this.

60s @ 130fps, stacked best 14% of 7500 frames.

I have a UV filter that I'll have to try supposedly giving details in the atmosphere. I thought IR would bring some but it's pretty bland. :question:

[rustigsmed]

Looking great Marc! Yes most of the cloud detail is in uv only really minor in ir (I saw a great version on astro bin showing the separate channels today).

I added a Venus to my recent Jupiter post ours look pretty similar so think you were in focus too

[multiweb]

That's a very detailed shot. The filter is over 800nm vs. 742nm so I wonder if that would make any difference. Also the limb is very sharp and defined so I reckon the seeing and/or focus in my shot is not 100% and that might be needed to get any details to show up. I'll give it another go when conditions allow.

[N1]

Marc, excellent shot of my favourite planet (other than our own). She's gibbous right now so yep that's what it should look like. What scope was this with? I took one recently and it's similar. I'll post it later. I was stoked to just get the phase though, and after sunset which is unheard of around here. Visual in the dob was similar - no albedo features but pleasingly sharp view of the limb and slightly fuzzier terminator. Yes the IR is great for cutting through the seeing but the UV does yield a little albedo detail but you need excellent seeing as exposure times increase massively.


I think there is a resolution tradeoff to be considered with longer wavelength longpasses.

[multiweb]

Thanks Mirko. :thumbsup: Not even sure what the QE of the 462MC is under 400nm. Will give it a go next session. I have on order a 807nm IR pass from Astronomik. See if that increases contrast.

I'm still not convinced the limb is ok. Should be sharper. :question:
Good fun to play with anyway. :)