From: Jim Chung <jim_chung@sunshine.net>

Date: April 19, 2009 11:50:51 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Re: Tethys Transit animation, sort of ......

Hi Milton,

I only shot one RGB image and that was at the end of the session with a manual filter wheel.  With the increased exposure time (from 66ms to 120 ms) there simply isn't enough time to capture RGBs without showing a low of moon moement.  I just made LRGB images for each frame of the animation.

I will have to try using my colour DMK for Jupiter animation this summer.

J

Quoting Milton Aupperle <milton@outcastsoft.com>:

Hi Jim;

Nice sequence.

I was going to try that a few weeks ago, but the "spring" (?) weather here sucks.

Were you manually advancing the color filter wheel for each RGB shot?

Thanks for sharing.

Milton Aupperle

--- In Astro_IIDC@yahoogroups.com, "jimchung2338" <jim_chung@...> wrote:

It was good seeing on the night of April 15th and there was a scheduled transit of Tethys starting at just before 9pm and ending by midnight, perfectly timed with the rise of Saturn in Toronto.

http://tech.groups.yahoo.com/group/Astro_IIDC/files/Planetary/TethysTransit2.gif

Shot with C8 at f20 with mono PGR Flea camera and Custom Scientific filters at 15 minute intervals for 80s to collect about 1200 frames.  All automated with Applescript using AstroIIDC to both capture and autoguide keeping Saturn somewhat centered on the ccd.

Can't really see Tethys at all until it clears the face of Saturn.  Hoping weather cooperates for the Titan transit at the end of the month which should be readily visible.

Jim