From: "Alan Friedman" <alan@greatarrow.com>
Date: April 24, 2005 1:32:01 PM MDT
To: Astro_IIDC@yahoogroups.com
Subject: jupiter with moons/ 4-19-05
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