Jupiter this morning (06/06/07) - advice needed

[mpeniak]

I took this yesterday which is stacked from 2000 frames at 5fps, which mean I was recording AVI for 5-6mins.

My question is: how long can I be recording AVI so that the final image is not blurred as a result of Jupiter rotation?

Cheers

Martin

[Akyra]

Only stack frames of the same face of Jupiter, you could have quite a few output images then, or maybe a highly detailed animation....

[Kai]

Personally i always go for 3 mins @ 10fps,For 5 fps it will have to be very good conditions indeed.

[mpeniak]

Personally i always go for 3 mins @ 10fps,For 5 fps it will have to be very good conditions indeed.

I was recommended to go for 5fps or in worst case for 10fps. So why it is better to use 10fps when the visibility is not great? Or is it simply because you got greater chance to capture something with more detail in less time?

Cheers

Martin

[Kai]

Yup something like that

I might be wrong but i seem to remember being told that 3 mins was about the time you could image Jupiter (or maybe Saturn :?) without the rotation of the planet causing problems with blurring.

[GazOC]

Image scale (resolution per pixel) is 206 * pixel size/(f#*aperture)

pixel size for a Toucam is 5.6

Time = drift limit/((Pi*planet diameter)/ rotation period)

Planet diameter and drift limit are in arc/ secs

rotation period and time are in seconds

[mpeniak]

That might explain why that image is so blurred. I did not really think about rotation before. If it rotates approximately in 9 hours time so it must have moved a great deal in 6 minutes I was recording avi sequence.

[Kai]

Have a look at these guys images from OZ

http://www.iceinspace.com.au/mygallery/index.php?cat=4

Just leaves me gobsmacked

[mpeniak]

Image scale (resolution per pixel) is 206 * pixel size/(f#*aperture)

pixel size for a Toucam is 5.6

Time = drift limit/((Pi*planet diameter)/ rotation period)

Planet diameter and drift limit are in arc/ secs

rotation period and time are in seconds

What is drift limit please?

[Akyra]

Have a look at these guys images from OZ

http://www.iceinspace.com.au/mygallery/index.php?cat=4

Just leaves me gobsmacked

They are already imaging Mars!

[GazOC]

The drift limit is dependant on the resolution of the system (the first bit of maths), plug in 0.5 as a rough guide.

[GazOC]

BTW these bits'n'bobs come from Martin Mobberleys excellent book 'Lunar & Planetary Webcam Users Guide', def. worth a read.

[mpeniak]

Have a look at these guys images from OZ

http://www.iceinspace.com.au/mygallery/index.php?cat=4

Just leaves me gobsmacked

Nice images there. I had to check how they see Jupiter from Australia. Would not really thought that it is so near the zenith

[themos]

It's winter for them, so the ecliptic is high at night.