Venus in IR and UV from the 10.12.2021

[Pete Presland]

Venus has been blazing away on the horizon for months now, i finally managed to be in the "bottom of the garden, between the trees window" at the correct time of the day with clear skies 🙂 

Venus looked pretty good with the 807 filter to settle the atmosphere (1st image), Pretty grim with the UV filter though.

A nicely formed crescent in IR, but very difficult to get and sort of end result with the UV filter. Pleased to get anything, it took a lot of different methods to finally arrive at an image that looked anything like a planet . 

C9.25, asi290mm.

 

[neil phillips]

Can see the seeing fighting abillity of the IR Pete. Nice shape and texture being this low. I think the morning showing maybe better for us. Reason being if you get on venus before its too bright. as it keeps rising seeing often improves. though this is countered by increasing daylight. Still often a sweet spot occurs between calm air. And contrast not too washed out. Found in the past i got my best UV images under those conditions. I am getting together a cheap Venus filter system. W47 violet. and from Ali express A bg39 IR only block. for the w47 IR leak. Not as good as a dedicated UV but £30 i have also tried to get  a UG1 UV filter again china £2.50 combined with the BG39 will effectively be a schuler UV filter. hope it actually  Arrives. it may or may not. But i dont think we will have a long window of time on venus. this time around otherwise i may have got a dedicated UV again like you. 

Excellent IR there Pete great shot

Edited December 20, 2021 by neil phillips

[Pete Presland]

Thanks Neil, i and a few others will be very interested to see how that combination works.

[NenoVento]

Neil, I tried a similar combination ( W47+BG39 ZWB1) in the afternoon - early evening last year (or maybe the year before) with my IMX290 mono camera and my CPC 800, but couldn't get anything. The stack absorbed so much light that I had to increase considerably the exposition time and, thus, the resulting video file had ridiculous FPS values, totally uncapable to fight the crazy seeing via lucky imaging. Finally, I ordered a FGUVM filer from Thor Labs which I didn't get in time to try before the planet got too close to the Sun... 

Regards,

NV

Edited December 20, 2021 by NenoVento
a filter name error, sorry

[Trevor N]

16 hours ago, Pete Presland said:

Venus has been blazing away on the horizon for months now, i finally managed to be in the "bottom of the garden, between the trees window" at the correct time of the day with clear skies 🙂 

Venus looked pretty good with the 807 filter to settle the atmosphere (1st image), Pretty grim with the UV filter though.

A nicely formed crescent in IR, but very difficult to get and sort of end result with the UV filter. Pleased to get anything, it took a lot of different methods to finally arrive at an image that looked anything like a planet . 

C9.25, asi290mm.

 

Nice image Pete. I've had similar problems finding an optical window between trees and over buildings. I will be interested as well to see the results of the various filter combination. Trevor 

[neil phillips]

6 hours ago, NenoVento said:

Neil, I tried a similar combination ( W47+BG39) in the afternoon - early evening last year (or maybe the year before) with my IMX290 mono camera and my CPC 800, but couldn't get anything. The stack absorbed so much light that I had to increase considerably the exposition time and, thus, the resulting video file had ridiculous FPS values, totally uncapable to fight the crazy seeing via lucky imaging. Finally, I ordered a FGUVM filer from Thor Labs which I didn't get in time to try before the planet got too close to the Sun... 

Regards,

NV

Cheers for the info. I might be using a 10" scope so fps will be higher. Ive had good results with Schuler uv. which also has low transmission. The real problem with w47 and BG39 is low contrast in UV. So i may or may not pick something up. But only paid a low price for the filter stack. So worth trying maybe. Ive seen reasonable results with the combo. 

[Ibbo!]

My couple of reasonably successful UV images of Venus came with the 8" RC rather than the C11.

 

I have not tried this time round due to the altitude and local horizon.

[Ibbo!]

Done a little looking around on the net and it looks as though 2023 is the next decent year.

 

https://in-the-sky.org/news.php?id=20220209_11_100