Archive for September, 2008

Tuesday 23rd September 2008

Sunday was clear but I knew I’d be up at 6:30am for work so thought it best not to image into the early hours. Instead I completed converting my PC to Linux and set about looking for image processing tools. Hmmm, I’ve been spoiled with the options available to me under Windows and now I’m struggling to find anything that will stack multiple FITS. I can do post processing using the GIMP but without a stacking option (and histogram stretch options) I found I had to revert back to K3CCDTools under Windows. I ran Windows in a VMWare session though :)

Monday was clear but by the time I get home from Karate it’s too late to set up and I don’t have the energy anyway :(

So here we are on Tuesday, a clear sky, the nights drawing in and I have everything set up by 7:30pm. I decided to pick out some old friends towards the North, which turned out to give me an insight into the issues I have with mount movement. Focusing my attention on object close to the meridian I was able to increase exposures to 60 seconds in some cases. I had to discard a large number of frames, but those that were usable had much better dynamic range than the 10, 20 and 30 second shots I’d been taking recently.

NGC4605 - Galaxy
NGC4605 - Galaxy
M27 - The Dumbbell Nebula
M27 - The Dumbbell Nebula
NGC6503 - Galaxy
NGC6503 - Galaxy
NGC6946 - Galaxy
NGC6946 - Galaxy
NGC5907 - The Splinter Galaxy
NGC5907 - The Splinter Galaxy
 

I returned to NGC6946 to see if there was any trace of SuperNova SN2008S. I had taken images in January and February around the time this SuperNova was discovered and wanted to see if anything remains. I’ll have to create one of those blink images to show where it is, not tonight though.

Saturday 20th September 2008

Another clear night, even though I can barely keep my eyes open I know these opportunities don’t come around too often so I’d be a fool not to get the scope out again.

I’m still disappointed with the results, the short frame times result in images that lack any depth and need to be stretched to the point that they become black and white
as opposed to shades of grey. But I know this is going to take some time to master so I can be critical as it pushes me to do better next time.

M2 - Globular Cluster
M2 - Globular Cluster
M27 - The Dumbbell Nebula
M27 - The Dumbbell Nebula
M81 - Bodes Galaxy
M81 - Bode’s Galaxy
M92 - Globular Cluster
M92 - Globular Cluster
M102 - Galaxy
M102 - Galaxy
M109 - Galaxy
M109 - Galaxy

Friday 19th September 2008

Another clear night, and it looks like there’ll be a few more over the weekend.

I spent some time playing with PemPro and PERecorder to see if I could make a PEC curve for the mount. It looks like each worm cycle has a different profile so I’m not sure how much help it would be. After spending several hours using the webcam to record PE I decided enough was enough and moved on to imaging with the Atik 16ic.

I didn’t get much, it was already late so really it was just a test of the PEC experiment.

M15 - Globular Cluster
M15 - Globular Cluster
M27 - The Dumbbell Nebula
M27 - The Dumbbell Nebula
M57 - The Ring Nebula
M57 - The Ring Nebula

Even after applying PEC I was still unable to manage more than about 30 seconds per frame.



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