From: "Tim" <tjp314@pacbell.net>

Date: April 25, 2005 12:08:37 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: jupiter with moons/ 4-19-05

Alan:

Very nice!  I tried imaging Jupiter the other night between cloud

systems, but the seeing 

was absolutely awful - and when I saw later on the news that the Jet

Stream was right over 

Los Angeles, I saw why!  We've got rain coming again later this week,

so it isn't likely that 

the seeing will be good between now and next week.  But I'll keep

trying.

Are you saying that Astro IIDC doesn't give you a box for registering

like Registax does, 

for instance?  That could be a problem, but maybe offset somewhat by

the greater ability 

to select stacked frames?  I particularly like the option of setting

the minimum quality for 

inclusion in the video up front.

I've got a bid on a used iBot going so that I can try Astro IIDC out

sooner rather than later 

(can't afford a new firewire webcam at the moment, and the bid is

REALLY low now, with 

only a few hours to go!).  So, even if it's one with the older, less

sensitive Sony chip in it, 

it'll get me started sooner.

planetarily,

-Tim.

--- In Astro_IIDC@yahoogroups.com, "Alan Friedman" <alan@g...> wrote:

Hi all - 

I posted an image to the files area of Jupiter taken last Monday

night a couple of hours 

after my recent saturn image - also using an RGB filterwheel with

my DMK21BF04 (the 

detail comes from the red and green filtered images only). It took

just over 2 minutes to 

capture a set of three streams - but with seeing around 5/10 only

about 380 frames 

from 

1300 were sharp enough to use for luminance. 

On the topic of alignment and stacking - this is a good example of

why I prefer to select 

the alignment areas manually. This image is created from three sets

of stacks aligned on 

the planet disk, ganymede and io. In two minutes there was little

movement seen in 

Jupiter's features, but aligning on ganymede allowed some markings

to be seen that 

were 

not visible in the images aligned using Jupiter's disk. Io shows

considerable movement 

over two minutes and would have appeared as a short line if I

hadn't processed a set of 

images centered on it's disk. 

I am really enjoying the filterwheel - with the fast response of

the settings and prefs of 

Astro IIDC it works great even on Jupiter (it would have been

hopeless to try this with my 

ToUcam running under BTV). I hope I'll get a shot at Jupiter in

good seeing conditions.

best wishes and steady skies

Alan