With the secondary mirror due back from polishing soon, we have been testing the performance of the telescope. That gives us the opportunity to do long sets of images when we are testing tracking performance. Naturally, I pointed the scope at some interesting objects. Here are a variety of images taken over the last few weeks.
Here is an image of the globular cluster M13, one of the larger ones (at least for the Northern Hemisphere). 11 x 60 seconds for luminance, and 5 x 60s for each color channel (red, green, blue). Seeing was very good; the raw data ranged in FWHM from 0.9 to 1.1 arc seconds. The final result was just a hair greater than 1". I applied a very light deconvolution to sharpen this up, yielding about 0.9" FWHM.
Galaxy M51, one of the treats of late spring skies in the Northern Hemisphere. This image is made from two sets of RGB images, 10 minutes x 2 in red, green, and blue. Taken with the one-meter telescope, on a night of moderate seeing conditions. Not the best, not the worst. These two galaxies are in the middle of a merger; they are beginning to get their bands of stars wrapped up in each other.
Another image assembled from tracking test data: M63, the Sunflower Galaxy. Three 600s images in each color (R, G, B). Very little processing.
M94, a very challenging galaxy to present - it has a huge range of brightness, such like M63 above.
The Owl Nebula, a test of whether numerous (34) shorter images (180 seconds each) could be used to create a good image. The dynamic range, in particular, is very good.
Copeland’s Septet of galaxies.
The Spider Galaxy. This one needs more data; it’s extremely faint. But this is a start.