planetery rotation question

[a10ken]

Hi folks

can anyone tell me the time limit for each planet before rotation will spoil the images.

thanks

ken

nextimage camera (web cam)

10" newt @f6.3)

eq5m

[Space Cowboy]

Depends on the focal length but generally the optimum avi length for Jupiter is 3-4 mins and 6 mins for Mars and Saturn.

[JamesF]

It certainly is scope- and camera-dependent, but I can't recall exactly how at the moment. Stuart is probably right that it's FL-related. Martin Mobberley(sp?) covers this in his webcam planetary imaging book. I'll dig out the detail later if I can. I tend to use around two minutes for Jupiter, six minutes for Saturn and ten for Mars.

Jupiter and Saturn rotate fairly quickly (~12 hours), but as Saturn is further away the resolution is lower so imaging runs can be longer. Although Mars is much closer, it's rotating much more slowly (~24 hours) so again, runs can be longer.

James

[a10ken]

thanks lads. great help:headbang:

[Russe]

Someone on here said 2-3 min Jupiter, 5-6 min Saturn and ~10 min Mars.

[JamesF]

I did, two posts up

I decided to work back through the calculations for capture time and focal ratios etc. from first principles. It's taken me a short while to understand all the maths, but I think I've got it sorted now, so I'll post all the details together shortly. Some of the results have some as a surprise to me I have to admit.

James