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Title: Jupiter Last night!
Post by: JohnP on Mar 02, 2004, 01:29:00

Hi All, Attached my efforts at Jupiter last night from 'chilly' Bromley. Taken with my Tal-2m at f24 with a Toucam Pro webcam & Baader IRB filter.

(http://homepage.ntlworld.com/john.punnett/graphics/jupiter/jupiter004.jpg)

Any comments welcome.

Cheers, John

Title: Jupiter Last night!
Post by: Rick on Mar 02, 2004, 01:48:00

240 frames stacked.... Are those collected at 25fps, meaning they represent about 10 seconds total elapsed time, or are they spread over a longer time?

Title: Jupiter Last night!
Post by: JohnP on Mar 02, 2004, 01:53:00

Hi Rick,

I captured a 60sec AVI at 5fps. Total = 300 frames. I then sorted & stacked the best 240.

Cheers, John

Title: Jupiter Last night!
Post by: Rocket Pooch on Mar 02, 2004, 02:02:00

John,

Considering how little exposure you had this is really excellent, I'm well impressed. Did you do the "no compression" thing as well?

Title: Jupiter Last night!
Post by: JohnP on Mar 02, 2004, 02:10:00

Hi Chris,

I tried it but to be honest it didn't seem to make any difference. The size of the avi files was the same 'with & without'

John

Title: Jupiter Last night!
Post by: Rick on Mar 02, 2004, 02:24:00

What sort of resolution were you getting on the original frames, and what sort of resolution is your processed image, in terms of pixels across the planet's image?

Title: Jupiter Last night!
Post by: JohnP on Mar 02, 2004, 02:45:00

Hi Rick,

I imaged with a resolution of 640X480 (for the video frame) The actual image posted is original size - I haven't enlarged it. I've counted the pixels & the planet is about 160 pixels in diameter (give or take a few). I think Jupiter currently extends about 44 arcsecs in diameter so that's about 3.6 pixels/ arcsec.

Cheers, John

Title: Jupiter Last night!
Post by: Whitters on Mar 02, 2004, 16:42:00

Very nice image John. Have you thought about trying to capture the full rotation over a few nights?

Title: Jupiter Last night!
Post by: JohnP on Mar 02, 2004, 17:04:00

Hi Paul,

Yes I have & hopefully one day I'll get around to it. I guess its rotation is a little too long to do it in one night?

Thks, John

Title: Jupiter Last night!
Post by: Whitters on Mar 03, 2004, 06:11:00

Yea, I think that a full rotation is arround ten hours, possible but you would be scraping the icicles off your nethers by the evenings end.
I managed about three hours worth whe I had a go and of course the GRS was nowhere to be seen. Intervals of 10 to fifteen minutes are short enough to give a smooth animation. Also you may need a spare hard disk to store all the AVI's :wink:

Title: Jupiter Last night!
Post by: Whitters on Mar 03, 2004, 06:13:00

Also don't forget the transit of Venus, a full solar disk and the black spot moving across would mage a good subject for an animation.

[ This Message was edited by: Whitters on 2004-03-02 22:14 ]

Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: JohnP on Mar 02, 2004, 01:29:00