LtE in CMO #271


@ . . . . . . . . . . Date: Sat, 29 Mar 2003 14:35:41 -0500

Subject: Jupiter images March 16,17,19


These images are a week or so old, but I have only had time today to finish the processing and annotating. These are probably the best 3 nights in the past 3 months, with milder weather and much better seeing.  All images are taken with the Pixcel 237 CCD and the 30cm, f13 classical cassegrain running at f33 using barlow projection. Colour webcam images have been on hold while waiting for a proper mounting adapter to arrive (ready for next session).


Images show a lot of structure in the NEB & SEB in the IR band and many of the dark spots, festoons and other features are also visible in the methane images.  The single UV images from the 17th is probably my best to date for that band. The image from the 19th shows the beginning of the transit of Io.


Please let me know if there are any questions on these images.  I have a few images that I am preparing that show some of the features in higher contrast and will send them out in the next day or so.


Take care,


@ . . . . . . . . . .Date: Sun, 6 Apr 2003 21:00:56 -0400

Subject: April 1 Images


I captured a transit of the GRS on the evening of April 1 using the 30cm classical cassegrain (f29) and a ToUcam.  Each colour image is a composite of the best 100 frames out of 800-900 captured during 30 seconds of video.  I was experimenting with exposures, but these images are taken at either 1/33 or 1/50 second.  The camera does a nice job of freezing the seeing.  Seeing was good (6-7/10), but very strong gusty winds caused a lot of motion during the video capture.  K3CCD tools was used to sort and co-add the single video frames, and MaximCCD was used to process and re-combine the colour images.


The images show as good a detail that I could obtain in past years with the Pixcel 237 (colour data).  I will continue to use the CCD camera for IR, Methane, and UV but I think planetary RGB will be done with the web cam from now on.


Let me know if there are any questions regarding these images.


Take care,


@ . . . . . . . . . .Date: Fri, 18 Apr 2003 16:01:08 -0400

Subject: Jupiter April 18


I captured a few video clips between 01:20 and 01:30 last night.  The best sequence was centred on 01:18 UT, a few minutes prior to Ed Graftons highly detailed image. I cannot note any sign of the oval interacting with the GRS.  Seeing last night was moderately good, but there was a gusty S.E. wind (up to 50-60 kmh) which made imaging very difficult.  There was also some thin cirrus cloud preceding an approaching warm front.  The wind finally got so bad that I couldn't keep the planet on the chip and I called it a night.


This image was taken with the ToUcam (320x240 mode) and the 30cm Classical Cassegrain at f 29 plus IR rejection filter.  The video sequence was captured at 30 fps and 1/33 sec exposure.  K3CCD tools was used to combine the best 90 of approx 680 frames.  Processing was performed with MaximCCD and annotated with PhotoShop.


Please forward any questions or comments that you may have.



(Ontario, Canada)

Maple Ridge Observatory

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