geoflewis

Nice Mars with plenty of detail coming through. Have you tried a smaller ROI to keep the frame rate higher? 6ms should be giving you nearer 200fps. What capture software are you using?

Thanks David

Thanks and yes that dark region is real. It looks to me as if it might be the ground, with the lighter blue being cloud above and around the polar hood. EDIT: I asked Richard McKim, Mars Section Director, BAA, who advised me that the dark area is the north end of Acidalium, seen through the polar hood.

The sawtooth edge that I’ve been getting on Mars this year is not something I’ve noticed before. However, I’ve always been at a much longer focal length, shooting shorter videos with mono RGB filters, then de-rotating and stacking them in WinJupos, to build the colour image. It may be due to imaging at F11/F12 with 6 min SERs, but I don’t really know; if anything I think it’s the smaller image scale…..🤷‍♂️

Thanks Neil, yes I resized from 96dpi to 192dpi, to smooth a sawtooth limb, which of course makes the image twice the size.

Well done Neil, very creative and well worth the effort.

Thanks Kostas, I'm very surprised how it turned out as I almost didn't bother as the sky was so foggy and Mars enveloped in a huge halo from the nearby Moon. So much so that it's thrown the colour readout of the camera off, so I had to manually force the colour with BGGR on one of the videos, when in fact it should be RGGB. The other one was correct. I've never seen that happen previously, it is very weird and I've no idea what happened.

After my session messing with different sampling on Jupiter and getting my fist Jupiter methane band image, I thought I'd try my luck with Mars. Laying close to the Moon, Mars was shrowded in brightly illuminated haze, but I opted for 3x6min SERs. However, I completed lost Mars to thickening fog during the 3rd SER, so this is a de-rotated stack of the best 10% from the other two. Xanthe and the polar hood are well seen.

Ok , no worries Vlaiv. I'm not sure about that, but maybe. I was using 13ms based on advice from a friend in Australia. Others suggested faster and slow fps, but I just went with that..... I'd not really thought it about it previously.

I have some old Mars videos (AVIs) from 2020 shot at F24 (according to FireCapture). They are mono 180s duration, but captured at 13ms. Equipment was ASI290MM (2.9mn px), C14, x2 TV PM, ADC. Any use?

Thnaks Vlaiv, yes, if exactly F18 to F11, which I am not sure, but the princple is good and something for me to consider in future, if/when I want to do a comparison.

The entire image was resized from 416x416 to 600x600, but of course Jupiter was in a larger relative ROI in the smaller image. Just my hopeless attempt to make the images look similar sizes.....🙄

I think I'll pass on that......😖

Sorry Vlaiv, I tried and failed to resize the F11 Jupiter image to the F18 image. All I achieved was to make both images including the border the same size, but clearly there was a larger ROI for the F11 image.. Here is the F11 image before I resized it. Does the maths work now. I get F11 v F18 as that is what FireCapture reports.

Thanks Lee, I've processed it about a dozen times. Tried drizzle x1.5 too and a bunch of different wavelet settings and think this is about as good as I can get from it. Must say it's far better than I anticipated, so your PM advice yesterday was a huge help, thanks. I also spent a few hours watch Chris Go on YT yesterday to get some pointers from him. All good learning I think. Might be interresting to see what I can do with the filter under better seeing conditions and by running a few shorter vids then de-rotating the resultant stacks as Chris Go recommends.. Also next year Jupiter will be much higher elevation, so more favourably placed....🤞

I'll round of my set of Jupiter images from last night, with my first attempt at Methane band (CH4). This is at F11 with the GRS just rotating into view and some other detail coming through too.

Nice images and good comparison Lee. Yes, I agree, the right hand images is far superior.

Well here is an F18 RGB image captured immediately prior to the above sharp IR image, i.e. the timestamp is just 7 mins earlier. It's so much softer than the IR, yet still too noisy I think. I don't know what to make of it, but maybe I'm just missing sharp focus operating at F18 on the RGB with the colour camera? 🤷‍♂️

Will do boss - at least I'll try 😉

I've just started processing the RGB SER that I captured immediately prior to that IR with identical focus, so it will be interesting to see how that turns out.....

I think you're completely correct Lee. I wonder what sampling rate Damian Peach uses with his rig in Selsey, do you know...?

Thanks Lee

Do you mean the IR?

I will continue to experiment Neil, but (and for me it's a pretty big but) I'm hating the huge file sizes and processing overhead of the higher sampled images..... It was less of a concern when I was capturing 1m videos for RGB with the mono 290MM camera, but these 6 min RGB SERs at F18 are huge (>15GB each) and take a long time to process, hence I'm not a fan, for what might be only small gains in resolution, if indeed any.

Thanks Neil. Lots of trail and maybe even more error.... Take a look at the two IR images I just put up - complete reversal in outcome, with the earlier F18 image far better.....