I saw the ISS today 20-08-2020

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I saw the ISS today 20-08-2020

Post by Montana » Thu Aug 20, 2020 5:21 pm

I saw the ISS today, first time I had a transit for a few years. Today was the best weather of the week with sunshine forecast which was a miracle too. It was 50/50 though as there was lots of passing clouds. I remember thinking, if Stuart can have luck, can I have some please, and I did. Clouds cleared off for 5 minutes during the transit :hamster: :hamster: :hamster:

It really does make you smile (well run round the garden like a lunatic).
Image2020-08-20 Frame 3392 crop a by Alexandra Hart, on Flickr

Image2020-08-20 Frame 3388 crop by Alexandra Hart, on Flickr

Image2020-08-20-ISS-transit-animation by Alexandra Hart, on Flickr

Image2020-08-20 CaK full solar disc ISS stack blue by Alexandra Hart, on Flickr

Image2020-08-20 CaK full solar disc ISS orange by Alexandra Hart, on Flickr

Alexandra



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Re: I saw the ISS today 20-08-2020

Post by ffellah » Thu Aug 20, 2020 5:29 pm

Fantastic captures, Alexandra !

Franco :bow :bow



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Re: I saw the ISS today 20-08-2020

Post by sulcis2000 » Thu Aug 20, 2020 5:31 pm

Really amazing shots!

Ale


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Re: I saw the ISS today 20-08-2020

Post by dhkaiser » Thu Aug 20, 2020 5:47 pm

well done, super captures!


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Re: I saw the ISS today 20-08-2020

Post by Carbon60 » Thu Aug 20, 2020 6:12 pm

Excellent :bow :bow :bow

It’s great when everything comes together. I’m so pleased for you, Alexandra.

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Re: I saw the ISS today 20-08-2020

Post by DeepSolar64 » Thu Aug 20, 2020 6:13 pm

Woohoo!!! And you got to see the Sun too!


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Re: I saw the ISS today 20-08-2020

Post by rsfoto » Thu Aug 20, 2020 6:16 pm

Hi Alexandra,

Congratulations. Great images and animation.


regards Rainer

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Re: I saw the ISS today 20-08-2020

Post by solardave » Thu Aug 20, 2020 6:45 pm

wow nice


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Re: I saw the ISS today 20-08-2020

Post by grimble_cornet » Thu Aug 20, 2020 9:44 pm

Congratulatons....... in Calcium too!!!!!


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Re: I saw the ISS today 20-08-2020

Post by eroel » Fri Aug 21, 2020 12:09 am

Alexandra:
Extraordinary shots and animation.
Best wishes.
Eric.



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Re: I saw the ISS today 20-08-2020

Post by Rusted » Fri Aug 21, 2020 5:01 am

Superb sharpness! Well done on your timely capture! :bow

My I ask your frame rate?


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Re: I saw the ISS today 20-08-2020

Post by alexhuangyan » Fri Aug 21, 2020 7:25 am

Congratulations. Great Calcium images and ISS fantastic captures.



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Re: I saw the ISS today 20-08-2020

Post by PDB » Fri Aug 21, 2020 7:33 am

That's a good one Alexandra.
Luck is usually the major factor for these events. (Needs to be one, low passagge, weather needs to be good ...)
Do yo have some info on the shutter speed you used. Since it is CAK probably you couldn't use the shortest exposure, but still remarkable sharp.

Rgrds,

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Re: I saw the ISS today 20-08-2020

Post by yltansg » Fri Aug 21, 2020 7:42 am

Congrats Alexandra!!!

Was it by chance or did you plan for it?

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Re: I saw the ISS today 20-08-2020

Post by JochenM » Fri Aug 21, 2020 9:43 am

That's great, Alexandra. You must be well pleased!

Lovely detail in the captures as well.



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Re: I saw the ISS today 20-08-2020

Post by Montana » Fri Aug 21, 2020 11:03 am

Thanks everyone! it was very lucky indeed :)

Rusted the frame rate is a mystery to me. Technically the ASI174 can do 128fps in avi and 60fps at 16bit ser. On the old computer this was always the same. On the new computer however I don't believe anything, for the last 3 weeks I have never been able to get more than 40fps on 16 bit ser, yesterday it was saying it was doing 80fps, I don't believe anything FireCapture says, I am sure it was doing 60fps which is it's max?

Alfred, yes it was planned, I had a Calsky alert a few days before in my email. I then checked Calsky again on the day as orbits can change and it was the same, so I knew it was coming for 0.7 seconds at 11:24 .11 seconds :) https://www.calsky.com/

Paul the exposure time was 0.614ms

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Re: I saw the ISS today 20-08-2020

Post by PDB » Fri Aug 21, 2020 11:22 am

Alexandra,

if you recorded in SER format, the player will report the framerate the file was recorded.
If I look at the size & speed (in '/min) for that transit, I would say everything above 40fps the ISS image will be overlapping from one frame to the next. (80fps probably half the ISS size)

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Re: I saw the ISS today 20-08-2020

Post by Montana » Fri Aug 21, 2020 11:43 am

You intrigued me, I had a look at the Firecapture log and its says 81fps (don't believe it for a minute). So I counted the frames with the ISS on and I get 57 frames. So for 0.7 second with 57 frames that is 81 fps!! Well, ZWO says it can only do 60fps in ser, so that is weird.

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Re: I saw the ISS today 20-08-2020

Post by PDB » Fri Aug 21, 2020 12:07 pm

Hi,

well the speeds have nothing to do with AVI orr SER. The camera just deliver a "raw" image to the sofware, and the software decides how to convert it/write to file ... Usually the speeds drops to half the speed when you change to 16 bit (and AVI can't do 16bit, SER can)

Theoretical speed for the camera are

Binning 1×1:
12bit ADC:
1936X1216@128FPS
640×480@309FPS
320×240@577FPS
Binning 2×2:
968×608@128FPS
Binning 1×1:
10bit ADC:
1936X1216@164FPS
640×480@397FPS
320×240@740FPS
Binning 2×2:
968×608@164FPS

(10 bit ADC is used when you set high-speed mode in FireCapture) Those speeds are between camera and software in GOOD conditions: fast usb and usblimit set to 100. That might cause problems when bandwith of USB is not good enough, so sometimes you need to reduce that, but then get lower framerate.

Second parameter is when capturing. Software needs to write the frames to disk, so if that is not fat enough, frames will be dropped and framerate goes down.

In 16 bir camera is sending twice as much data per frame, so framerate goes down.

Why FC reports these strange framerates I don't know. Never seen anything strange with my cams.

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Re: I saw the ISS today 20-08-2020

Post by Montana » Fri Aug 21, 2020 12:19 pm

Thanks Paul, these limits are correct 128fps at 8 bit AVI and 62fps at 16 bit ser exactly as specified when I bought it (at full frame rate) and this is what the old computer achieved. The new computer I couldn't get anymore than 40fps in Firecapture in 16bit ser except for yesterday when it achieved 81 fps at 16 bit full frame. I have absolutely no idea what is going on. I still can't get Firecapture 2.7 to run even with Torsten's fixes. I will be stuck on 2.6 forever :)

Alexandra



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Re: I saw the ISS today 20-08-2020

Post by PDB » Fri Aug 21, 2020 1:01 pm

Have you tried Genika? You can try without the camera registered in the licence file, it will work but you won't be able to use the record function.
If that shows the same problems, then there is something wrong with the ASI Camera driver. (That should install by itseld in latest W10, but you can always dowload the driver and install) Or you could try to install ZWO ASIStudio and see what that gives. (Not all functions from FC but it's not bad)

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Re: I saw the ISS today 20-08-2020

Post by grimble_cornet » Fri Aug 21, 2020 1:52 pm

Alexandra - I DO tend to trust Firecapture - for some things anyway :lol: :roll: :lol:

When I did my ISS capture a few weeks ago, I did exactly the same calculation of number of frames showing the ISS divided by transit time and compared the answer to what was reported by Firecapture. Like you, I found the numbers to agree perfectly - I got a much slower 26fps with the Grasshopper but 13 frames captured during a 0.55s transit were enough to get me smiling too :lol:

Its a pity you can't get FC v2.7 working as I find it to be a significant improvement. I had no problems getting it working with the Grasshopper ( it just auto-detected the camera and worked ) or my new ASI290MM. I have read of others having issues with v2.7 and ASI cameras and the suggestion that the problem is using an old version of the ASI SDK - v2.7 apparently needs the new version whereas v2.6 doesn't? If this wasn't part of the 'fixes' from Torsten then it might be worth a try? Others seem to have solved the problem by using the ASCOM drivers but all of my ASI cameras (120MM, 185MC and 290MM) work perfectly with v2.7 and the latest (29th June 2020) ASI SDK (from https://astronomy-imaging-camera.com/software-drivers) on two different laptops.

The other issue I have had on my old imaging computer is that despite running from a folder rather than being 'installed', Firecapture seems to write temporary stuff to various places on the HD which is not cleared when the programme closes unexpectedly. This sometimes means that a full re-boot is needed after, for example, a camera connection failure. If this isn't done then Firecapture often reports that the 'camera can't be started' or some other error. In the past I have spent many unhappy hours swearing at the laptop having connected/disconnected cameras and restarted Firecapture several times to no avail. Eventually in desparation I switched the laptop off...... only to find that everything worked perfectly once it was switched on again.

Unless you have done so recently, it might be worth downloading v2.7 again as I understand some changes to SDKs etc have been made to solve other problems. Sorry if all of this is 'old hat' that you have already done - just trying to help :oops:

Don't you just love technology :beanie:


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Re: I saw the ISS today 20-08-2020

Post by Rusted » Fri Aug 21, 2020 2:45 pm

:bow Thanks Alexandra. :bow

Does your new computer have an SSD? Or do you have an external SSD?
I'm a complete ignoramus when it comes to modern tech but I believe their speed can be beneficial with high speed cameras.
The little Samsung T5s are extremely useful for carrying lots of data from one computer to another.
External SSDs can provide the capacity often missing from onboard, laptop drives.
But you probably knew this anyway. ;)


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Re: I saw the ISS today 20-08-2020

Post by Starry Jack » Tue Aug 25, 2020 4:17 am

Alexandra,
I’ve been absent for a week and am catching up....WOWOWOWOWOWOWOWOWOWOW!


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Re: I saw the ISS today 20-08-2020

Post by EGRAY_OBSERVATORY » Tue Aug 25, 2020 11:47 am

Hello Alexandra.
A belated reply to your excellent imagery.

The animation is superb and all lines-of-light images are fab.

The Solar-disk may be fairly quiet, but with much detail of the ISS being seen, makes up for interesting images.

Thanks & well done
Regards
Terry



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